JP2007188299A - Multipoint measurement system and multipoint measurement method - Google Patents

Abstract

[PROBLEMS] To easily perform multipoint measurement.
Means for storing a measurement value of a first measurement point in a buffer memory as parent station measurement data, and when a measurement value of the first measurement point satisfies a preset trigger generation condition, The master station 4 having means for storing the trigger generation time based on the internal clock and the master station measurement data stored in the buffer memory and transmitting a trigger signal to each slave station, and the measurement value at the second measurement point A slave station 8 having means for measuring as slave station measurement data and a means for storing the trigger reception time based on the internal clock and the slave station measurement data stored in the buffer memory when a trigger signal is received is provided.
[Selection] Figure 2

Description

The present invention relates to a multipoint measurement system, and more particularly to a system for synchronizing measurement data between multiple measurement points by correcting the sampling time of measurement data.

In plant buildings where many electrical facilities are installed, harmonics and the like may enter the internal wiring, which may adversely affect the operation of the equipment. In such a case, there is a method of specifying a harmonic intrusion source by providing a plurality of measurement points on the wiring and simultaneously measuring a measurement value such as a voltage. When this method is used, it is necessary to acquire measurement data with extremely high synchronization such that the measurement accuracy of the sampling time is in the order of msec to μsec. This is because if the data at each measurement point is not synchronized, the temporal relevance of the measurement values cannot be understood, and the propagation state of the harmonics cannot be grasped.

As a method of acquiring highly synchronized data between a plurality of measurement points, there is a method as shown in FIG. That is, the master station 4 and the slave station 8 by a GPS (global positioning system) -equipped measuring instrument are arranged at each measurement point. The measuring instrument of each station receives time data transmitted from GPS satellites by the respective GPS antennas 5 and 9. The measuring instrument of each station synchronizes the measurement data of each measuring instrument by making the received time data into the sampling time of measurement data.

Patent Document 1 proposes the following measurement method for the purpose of measuring the charging current of the cable line with high accuracy. That is, a plurality of slave stations that measure the charging current are arranged at a plurality of measurement points. Each slave station, when receiving the measurement command signal from the master station, measures the charging current and transmits a response signal including the measurement result and response delay information for obtaining the charging current measurement timing to the master station. . The master station that has received the response signal accurately aligns the measurement results based on the response delay information included in the response signal. Thereby, it is described that the sum total of the charging current of the cable line is measured with high accuracy.

Further, Patent Document 2 proposes the following measurement method for the purpose of eliminating the deterioration of relay accuracy caused by the sampling time difference between the terminal stations, which is a problem in the current differential relay system. First, adjacent terminal stations are connected to each other through a plurality of transmission paths having opposite transmission directions. Then, one of the terminal stations (hereinafter referred to as a synchronous master station) transmits a timing reference signal at regular intervals to one of a plurality of transmission paths. The timing reference signal transmitted from the synchronous master station propagates through each terminal station and then returns to the own station. The synchronous master station measures the time (T1) required for the transmitted timing reference signal to return to its own station. Next, the synchronization master station transmits the time (T1) acquired by measurement to each terminal station (hereinafter referred to as a slave station) other than the synchronization master station. On the other hand, when the slave station receives the timing reference signal from the adjacent terminal station, the slave station transfers the timing reference signal to the other adjacent terminal station. The timing reference signal transferred from the slave station propagates through each terminal station and then returns to the own station. The slave station measures the time (T2) required for the transferred timing reference signal to return to the local station. Next, the slave station divides by 2 the value obtained by subtracting the time (T2) from the time (T1). This is an amount corresponding to the transmission delay time between the synchronous master station and the own station. Then, the slave station controls the sampling time so as to be a time that is backed by the transmission delay time from the time when the timing reference signal is received. As a result, it is described that the sampling times of all the terminal stations are accurately matched.

JP-A-8-62265 Japanese Patent Laid-Open No. 2-155421

In the multipoint measurement method based on the GPS time data described above, it is assumed that the measurement point can receive radio waves from GPS satellites. Therefore, it cannot be used inside a plant or in a house where radio waves from GPS satellites cannot be received.

Moreover, in the invention which concerns on patent document 1, the phase alignment of the sine waveform of measurement data is performed based on the transmission delay time of a measurement command signal, and it presupposes that a measurement object is a fixed sine waveform. Therefore, it cannot be used when it is desired to measure a waveform having a short duration such as irregular harmonic invasion or instantaneous voltage fluctuation.

Furthermore, in the invention according to Patent Document 2, it is assumed that a communication network capable of large-capacity communication is prepared in advance in order to transmit a response signal having a large amount of information during measurement. Therefore, it is not easy to install a measuring device when it is desired to temporarily measure a large number of measurement points simultaneously.

Therefore, the present invention can easily obtain measurement data that can be synchronized between multiple measurement points in a multi-point measurement system without taking the trouble of installing a communication network even at measurement points where GPS satellite radio waves cannot be received. It is an object to provide a system that can be acquired.

<First Configuration> In order to achieve the above-mentioned problems, the following means were adopted. That is, the present invention is a multipoint measurement system comprising a master station and a slave station, and the master station buffers the measurement value of the first measurement point as master station measurement data (temporarily stores data). And the master station measurement stored in the buffer and the trigger generation time based on the internal clock when the measurement value of the first measurement point satisfies a preset trigger generation condition. Means for storing data and transmitting a trigger signal to each slave station, the slave station storing a measurement value at a second measurement point in a buffer as slave station measurement data, and the trigger signal Is a multipoint measurement system having means for storing a trigger reception time based on an internal clock and the slave station measurement data stored in a buffer when receiving the signal, the trigger reception time being traced back by a transmission delay time At time Correct, the trigger reception time was that it comprises means for rewriting the sampling time of the slave station measurement data to match the trigger generation time.

According to the present invention, the master station and the slave station each store the measurement data stored in the buffer in conjunction with the trigger. Therefore, the measurement data of both stations can always be acquired as data having a certain temporal relationship. Furthermore, the multipoint measurement system rewrites the sampling time of the slave station measurement data so that the sampling time of the slave station measurement data is synchronized with the master station measurement data. Therefore, it is possible to acquire measurement data that is synchronized between the measuring instruments.

<Second Configuration> The master station transmits a transmission delay time measurement signal from the master station to the slave station, and the transmission delay time measurement signal transmitted to the slave station returns to the master station. Means for measuring the time (ΔT) required until the time, and means for obtaining a transmission delay time required when the trigger signal is transmitted from the master station to the slave station by dividing the time (ΔT) by 2; May be further included in the first configuration.

According to the present invention, the master station obtains a transmission delay time required for transmitting the trigger signal from the own station to the slave station. Therefore, it is possible to acquire the transmission delay time necessary for synchronizing the measurement data between the measuring instruments.

<Third Configuration> The slave station transmits a transmission delay time measurement signal from the slave station to the master station, and the transmission delay time measurement signal transmitted to the master station returns to the slave station. Means for measuring the time (ΔT) required until the time, and means for obtaining a transmission delay time required when the trigger signal is transmitted from the master station to the slave station by dividing the time (ΔT) by 2; May be further included in the first configuration.

According to the present invention, the slave station acquires a transmission delay time required when the trigger signal is transmitted from the master station to the own station. Therefore, it is possible to acquire the transmission delay time necessary for synchronizing the measurement data between the measuring instruments.

<Fourth Configuration> The master station further has means for notifying the slave station of the transmission delay time and the trigger occurrence time, and the slave station is notified of the trigger reception time from the master station. Means for rewriting the sampling time of the slave station measurement data so that the corrected trigger reception time is matched with the trigger generation time notified from the master station. The second configuration may further be included.

According to the present invention, the slave station rewrites the sampling time of the slave station measurement data so that the sampling time of the slave station measurement data is synchronized with the master station measurement data. Therefore, it is possible to acquire measurement data that is synchronized between the measuring instruments.

<Fifth Configuration> The master station further has means for notifying the slave station of the trigger occurrence time, and the slave station corrects the trigger reception time to a time that is traced back by the transmission delay time. The third configuration may further include means for rewriting the sampling time of the slave station measurement data so that the modified trigger reception time coincides with the trigger generation time notified from the master station.

According to the present invention, the slave station rewrites the sampling time of the slave station measurement data so that the sampling time of the slave station measurement data is synchronized with the master station measurement data. Therefore, it is possible to acquire measurement data that is synchronized between the measuring instruments.

<Sixth Configuration> In the present invention, the master station stores the measurement value of the first measurement point in the buffer as the master station measurement data, and the measurement value of the first measurement point is preset. Storing the trigger generation time based on the internal clock when the trigger generation condition set in advance and the master station measurement data stored in the buffer are stored and transmitting a trigger signal to each slave station, Storing the measurement value of the second measurement point in the buffer as slave station measurement data, the trigger reception time based on the internal clock when the trigger signal is received, and the slave station measurement data stored in the buffer. The multi-point measurement system corrects the trigger reception time to a time that is traced back by a transmission delay time, and the trigger reception time matches the trigger occurrence time. It was decided to perform the step of rewriting the sampling time station measurement data.

According to the present invention, the master station and the slave station each store the measurement data stored in the buffer in conjunction with the trigger. Therefore, the measurement data of both stations can always be acquired as data having a certain temporal relationship. Furthermore, the multipoint measurement system rewrites the sampling time of the slave station measurement data so that the sampling time of the slave station measurement data is synchronized with the master station measurement data. Therefore, it is possible to acquire measurement data that is synchronized between the measuring instruments.

<Seventh Configuration> The master station transmits a transmission delay time measurement signal from the master station to the slave station, and the transmission delay time measurement signal transmitted to the slave station returns to the master station. Measuring the time (ΔT) required until the time, and obtaining the transmission delay time required when the trigger signal is transmitted from the master station to the slave station by dividing the time (ΔT) by 2; May be further executed in the sixth configuration.

According to the present invention, the master station obtains a transmission delay time required for transmitting the trigger signal from the own station to the slave station. Therefore, it is possible to acquire the transmission delay time necessary for synchronizing the measurement data between the measuring instruments.

<Eighth Configuration> The slave station transmits a transmission delay time measurement signal from the slave station to the master station, and the transmission delay time measurement signal transmitted to the master station returns to the slave station. Measuring the time (ΔT) required until the time, and obtaining the transmission delay time required when the trigger signal is transmitted from the master station to the slave station by dividing the time (ΔT) by 2; May be further executed in the sixth configuration.

According to the present invention, the slave station acquires a transmission delay time required when the trigger signal is transmitted from the master station to the own station. Therefore, it is possible to acquire the transmission delay time necessary for synchronizing the measurement data between the measuring instruments.

<Ninth Configuration> The master station further executes a step of notifying the slave station of the transmission delay time and the trigger occurrence time, and the slave station is notified of the trigger reception time from the master station. Correcting the sampling time of the slave station measurement data so that the corrected trigger reception time coincides with the trigger generation time notified from the master station. Further, the seventh configuration may be further executed.

According to the present invention, the slave station rewrites the sampling time of the slave station measurement data so that the sampling time of the slave station measurement data is synchronized with the master station measurement data. Therefore, it is possible to acquire measurement data that is synchronized between the measuring instruments.

<Tenth Configuration> The master station further executes a step of notifying the slave station of the trigger occurrence time, and the slave station corrects the trigger reception time to a time that is traced back by the transmission delay time. The step of rewriting the sampling time of the slave station measurement data so that the modified trigger reception time coincides with the trigger generation time notified from the master station may be further executed in the eighth configuration. .

According to the present invention, the slave station rewrites the sampling time of the slave station measurement data so that the sampling time of the slave station measurement data is synchronized with the master station measurement data. Therefore, it is possible to acquire measurement data that is synchronized between the measuring instruments.

<Eleventh Configuration> The present invention is a multipoint measurement system comprising a master station and a slave station, and the master station stores the measurement value of the first measurement point as master station measurement data. And means for storing a trigger generation time based on an internal clock and transmitting a trigger signal to each slave station when a measured value at the first measurement point satisfies a preset trigger generation condition. And the slave station has means for storing the measurement value at the second measurement point as slave station measurement data, and means for storing a trigger reception time based on an internal clock when the trigger signal is received. The multi-point measurement system in the previous period corrects the trigger reception time to a time that is traced back by a transmission delay time, and rewrites the sampling time of the slave station measurement data so that the trigger reception time matches the trigger generation time. With And the.

According to the present invention, the master station stores master station measurement data and trigger occurrence time, and the slave station stores slave station measurement data and trigger reception time. Therefore, the measurement data of both stations can always be acquired as data having a certain temporal relationship. Furthermore, the multipoint measurement system rewrites the sampling time of the slave station measurement data so that the sampling time of the slave station measurement data is synchronized with the master station measurement data. Therefore, it is possible to acquire measurement data that is synchronized between the measuring instruments.

<Twelfth Configuration> In the present invention, the master station stores the measurement value of the first measurement point as master station measurement data, and the measurement value of the first measurement point is set in advance. The trigger generation time based on the internal clock is saved and the trigger signal is transmitted to each slave station when the trigger generation condition is satisfied, and the slave station transmits the measurement value at the second measurement point to the slave station. A step of saving as measurement data and a step of saving a trigger reception time based on an internal clock when the trigger signal is received, and the multipoint measurement system goes back the trigger reception time by a transmission delay time The time is corrected, and the step of rewriting the sampling time of the slave station measurement data so that the trigger reception time coincides with the trigger occurrence time is executed.

According to the present invention, in conjunction with the trigger, the master station stores the trigger occurrence time, and the slave station stores the trigger reception time. Therefore, the measurement data of both stations can always be acquired as data having a certain temporal relationship. Furthermore, the multipoint measurement system rewrites the sampling time of the slave station measurement data so that the sampling time of the slave station measurement data is synchronized with the master station measurement data. Therefore, it is possible to acquire measurement data that is synchronized between the measuring instruments.

According to the present invention, it is possible to easily obtain synchronized measurement data among multiple measurement points without taking the troublesome work of installing a communication network even at measurement points where GPS satellite radio waves cannot be received.

A multipoint measurement system according to the best mode for carrying out the present invention will be described below with reference to the drawings.

Hereinafter, the configuration of the first embodiment is an exemplification, and the present invention is not limited to the configuration of the first embodiment.

<Configuration of Embodiment 1> FIG. 2 is a diagram showing a main configuration of a multipoint measurement system according to Embodiment 1. In FIG. As shown in FIG. 2, the multipoint measurement system according to the first embodiment includes an electric wire 1, a sensor 2, a sensor 3, a master station 4, a sensor 6, a sensor 7, a slave station 8, and a communication line 10.

The electric wire 1 is a general electric wire. Typical electric wires are high-voltage electric wires used for wide-area transmission and distribution networks, electric wires used for indoor wiring, communication wires, instrumentation wires, and the like. The purpose of the first embodiment is to measure the voltage at each measurement point provided on the same electric wire at multiple points. Therefore, FIG. 2 illustrates the case where the measurement points are the same electric wire. However, each measurement point may be an electric wire of a different system or voltage. Moreover, a measurement point is not restricted to an electric wire. That is, the measurement quantity to be measured may be, for example, earthquake acceleration, precipitation amount of weather, atmospheric pressure, wind force, atmospheric pressure, weight, pressure, flow rate, acceleration, sound, image, cosmic radiation dose, and the like.

The sensors 2 and 3 are voltage probes that measure the voltage of the electric wire 1 and transmit it to the master station 4. The sensors 6 and 7 are voltage probes that measure the voltage of the electric wire 1 and transmit it to the slave station 8. The purpose of the first embodiment is to measure the voltage at each measurement point provided on the electric wire at multiple points. Therefore, FIG. 2 shows the case where the sensor is a voltage probe. However, as described above, the amount to be measured is not limited to voltage. That is, the sensor may be, for example, a capacitor, a coil, a strain gauge, an electromagnetic flow meter, a thermistor, a pH sensor, a semiconductor sensor, or the like as long as it detects a measurement amount to be measured and converts it into an electric amount. FIG. 2 shows the case where there are two sensors at each station. However, there may be one sensor for each station, or three or more sensors. Further, the sensors 2 and 3 and the sensors 6 and 7 are not limited to the same type (for example, voltage probe). That is, a combination of different types (for example, a voltage probe and a current clamp) may be used.

The configurations of the master station 4 and the slave station 8 will be described later. In FIG. 2, only one slave station 8 is shown. However, the number of slave stations is not limited to one, and there may be a plurality of slave stations.

The communication line 10 is a communication line that connects between the master station 4 and the slave station 8. The communication line 10 communicates a trigger signal, a transmission delay time measurement signal, a trigger occurrence time, and a transmission delay time. The trigger signal and the transmission delay time measurement signal are relatively simple signals composed of stepped voltage fluctuations. The trigger signal and the transmission delay time measurement signal are not limited to step signals. That is, any signal can be used as long as the slave station 8 can recognize the trigger signal transmitted from the master station 4. On the other hand, the trigger occurrence time and the transmission delay time are relatively complicated time data signals. In FIG. 2, a wired communication means is shown. However, communication between the master station and the slave station is not limited to wired communication. That is, if the master station and the slave station can communicate with each other, and even the trigger signal can always communicate with a certain time delay, the power line already installed in the building of the wireless communication, the local telephone device, the measurement location, etc. It may be power line communication using In the first embodiment, it is assumed that the trigger occurrence time and the transmission delay time can be communicated. However, the communication line 10 is not limited to one that can communicate the trigger occurrence time and the transmission delay time. That is, in the case of a communication line that cannot communicate the trigger occurrence time and the transmission delay time, these data may be carried artificially.

FIG. 3 is a diagram illustrating a main configuration of the master station 4 according to the first embodiment. The master station 4 is a portable general-purpose measuring instrument. This measuring instrument consists of an internal clock, sensor input interface, communication interface, CPU (central processing unit), temporary storage device (memory), storage device (hard disk), operation unit, display unit, elapsed time counter, etc. Yes. As shown in FIG. 3, the master station 4 includes a trigger output detection unit 11, a trigger measurement unit 12, a trigger condition file 13, a master station measurement data storage file 14, an external trigger output unit 15, and a trigger generation time transmission unit 16.

The trigger output detection unit 11 compares the measured amount of the measurement point acquired by the sensor input interface with the set value of the trigger generation condition set in the trigger condition file 13, and generates a trigger signal when the trigger generation condition is satisfied. . In the first embodiment, it is assumed that the trigger output detection unit 11 is configured by a program. However, the configuration is not limited to a program, and a digital circuit that compares the register value of the trigger condition may be used, or an analog circuit using a voltage comparator may be used.

The trigger measurement unit 12 accumulates the measurement data acquired from the sensor input interface in a temporary storage device using a FIFO method (first-in first-out method). In the first embodiment, the trigger measurement unit 12 is configured to store the measurement data in the buffer. However, the measurement data may be always stored if the storage device has sufficient capacity.

The trigger condition file 13 stores setting values that are trigger generation conditions. The set value is input from the operation unit by the measurement operator. In the first embodiment, it is assumed that the trigger condition file 13 is constituted by a data file. However, the configuration is not limited to a data file, and may be a configuration in which a register value of a digital circuit is set with a dip switch, or a reference voltage of a voltage comparator may be set with a variable resistor.

The master station measurement data storage file 14 stores the measurement data accumulated in the buffer of the trigger measurement unit 12 when a trigger signal is generated in the trigger output detection unit 11. The stored data includes measurement data, sampling time based on the internal clock, and trigger generation time based on the internal clock. In the first embodiment, it is assumed that the master station measurement data storage file 14 is configured by a storage device using a hard disk. However, the configuration is not limited to a hard disk, and may be configured by a recording device / medium such as a magnetic tape, CD, DVD, or memory card.

The external trigger output unit 15 transmits the trigger signal generated by the trigger output detection unit 11 to each slave station using a communication interface. The communication interface is connected to each slave station by a communication line 10.

The trigger generation time transmission unit 16 transmits the trigger generation time based on the internal clock to each slave station using the communication interface. The communication interface communicates with each slave station using the communication line 10. When the sampling time correction of the measurement data is not performed inside the slave station 8, the trigger generation time transmitter 16 may not be provided in the master station 4. In this case, the measurement operator collects data of the trigger occurrence time on the display unit.

FIG. 4 is a diagram illustrating a main configuration of the slave station 8 according to the first embodiment. The slave station 8 is a portable general-purpose measuring instrument. The measuring instrument includes an internal clock, a sensor input interface, a communication interface, a CPU (Central Processing Unit), a temporary storage device (memory), a storage device (hard disk), an operation unit, a display unit, and the like. As shown in FIG. 4, the slave station 8 includes a transmission delay time measurement data storage unit 19, a trigger measurement unit 20, an external trigger input unit 21, a slave station measurement data storage file 22, a trigger generation time reception unit 23, and a delay time measurement unit. 24, a delay time correction data editing unit 25, and a master station synchronous measurement data storage file 26.

The transmission delay time measurement data storage unit 19 stores a time required for transmitting the trigger signal from the master station 4 to the slave station 8 (hereinafter referred to as a transmission delay time). In the first embodiment, the transmission delay time is stored in the slave station 8. However, if the sampling time correction of the measurement data is not performed inside the slave station 8, the transmission delay time need not be stored in the slave station 8. In this case, the measurement operator collects transmission delay time data on the display unit.

The trigger measurement unit 20 has the same configuration as the trigger measurement unit 12 described above.

The external trigger input unit 21 receives a trigger signal transmitted from the master station 4 using a communication interface. The communication interface is connected to the master station 4 by a communication line 10.

The slave station measurement data storage file 22 stores the measurement data accumulated in the buffer of the trigger measurement unit 20 when the external trigger input unit 21 receives the trigger signal. The saved data configuration and other configurations are the same as those of the parent station measurement data storage file 14 described above.

The trigger occurrence time receiving unit 23 receives the trigger occurrence time transmitted from the master station 4 using a communication interface. The communication interface is connected to the master station 4 by a communication line 10. If the sampling time correction of the measurement data is not performed inside the slave station 8, the trigger generation time receiving unit 23 may not be provided in the slave station 8.

The delay time measuring unit 24 acquires the time when the trigger signal transmitted from the master station 4 is received as the trigger reception time based on the internal clock. When the sampling time correction of the measurement data is not performed inside the slave station 8, the measurement operator acquires the trigger reception time data on the display unit.

The delay time correction data editing unit 25 edits the data in the slave station measurement data storage file 22 based on the transmission delay time, trigger generation time, and trigger reception time (= trigger generation time by the slave station internal clock). In the first embodiment, it is assumed that the delay time correction data editing unit 25 is configured by a program. However, it may be constituted by a digital circuit. Further, when the measurement data sampling time correction is not performed inside the slave station 8, the delay time correction data editing unit 25 may not be provided in the slave station 8. In this case, the sampling time correction of the slave station measurement data is performed by a general-purpose personal computer or the like.

The master station synchronization measurement data storage file 26 stores the slave station measurement data whose sampling time has been corrected as master station synchronization measurement data. In the first embodiment, it is assumed that the master station synchronization measurement data storage file 26 is configured by a storage device using a hard disk. However, the configuration is not limited to a hard disk, and may be configured by a recording device / medium such as a magnetic tape, CD, DVD, or memory card.

<Processing Flow> The procedure for using the multipoint measurement system according to the first embodiment will be described below with reference to FIGS.

<Measurement of transmission delay time> The measurement operator activates the measuring devices of the master station 4 and the slave station 8, respectively. Next, a transmission delay time measurement switch provided at the input unit of the master station 4 is pressed. When the transmission delay time measurement switch is pressed, the master station 4 transmits a transmission delay time measurement signal from the external trigger output unit 16 to the slave station 8 and starts an elapsed time counter synchronized with the internal clock. The slave station 8 returns the transmission delay time measurement signal to the master station 4 immediately after receiving the transmission delay time measurement signal at the external trigger input unit 21. When the master station 4 receives the transmission delay time measurement signal returned from the slave station 8, the master station 4 stops the elapsed time counter. Next, the transmission delay time required when the trigger signal is transmitted from the master station to the slave station by dividing the elapsed time based on the value of the elapsed time counter (corresponding to the time (ΔT) of the present invention) by 2. And the transmission delay time is transmitted from the trigger generation time transmission unit 16 to the trigger generation time reception unit 23 in the slave station 8 as transmission delay time measurement data. The slave station 8 stores the transmission delay time measurement data received from the master station 4 as the transmission delay time measurement data 19. When measuring the transmission delay time, if the internal processing time of the master station or slave station cannot be ignored, the value obtained by subtracting the internal processing time of the master station or slave station from the elapsed time based on the value of the elapsed time counter is 2. It is desirable to divide and obtain the transmission delay time required when the trigger signal is transmitted from the master station to the slave station.

<Setting of trigger condition> The measurement operator sets the trigger condition in the trigger condition file 13 from the operation unit of the master station 4 after the measurement of the transmission delay time is completed. The measurement operator shifts the measuring devices of the master station 4 and the slave station 8 to the measurement state when the trigger condition setting is completed.

FIG. 5 is a processing flow of the measuring instrument of the master station 4. The master station 4 that has shifted to the measurement state captures the measurement data measured by the sensors 2 and 3 into the trigger output detection unit 11 and the trigger measurement unit 12 (S1). The trigger output detection unit 11 performs an operation of comparing the measurement data with the trigger condition setting in the trigger condition file 13 (S2). The trigger output detection unit 11 transmits a trigger signal when the trigger condition is satisfied. The trigger measurement unit 12 accumulates measurement data in which a measurement time based on an internal clock (not shown) and a measurement value are synchronized in a buffer that is a temporary storage device of the trigger measurement unit 12. Further, the temporary storage device of the trigger measurement unit 12 sequentially discards old measurement data by the FIFO method until a trigger signal is transmitted (S3). On the other hand, when the trigger signal is transmitted, the temporary storage device of the trigger measurement unit 12 holds the measurement data accumulated in the buffer that is the temporary storage device (S4), and stores the measurement data in the master station measurement data storage file 14. (S5)
. When the trigger signal is transmitted, the external trigger output unit 15 generates a trigger signal for the slave station (S6), and transmits the trigger signal for the slave station (S7). When the trigger signal is transmitted, the trigger generation time transmitter 16 generates a trigger generation time for the slave station based on the internal clock (S8), and transmits the trigger generation time to the slave station (S9).

FIG. 6 is a processing flow of the measuring instrument of the slave station 8. The slave station 8 that has shifted to the measurement state takes the measurement data measured by the sensors 6 and 7 into the trigger measurement unit 20. The trigger measurement unit 20 accumulates measurement data in which a measurement time and a measurement value based on an internal clock (not shown) are synchronized in a buffer that is a temporary storage device of the trigger measurement unit 20. In addition, the temporary storage device of the trigger measurement unit 20 sequentially discards old measurement data using the FIFO method until a trigger signal is received. On the other hand, when receiving the trigger signal from the external trigger input unit 21 (S10), the temporary storage device of the trigger measurement unit 20 holds the measurement data accumulated in the buffer which is the temporary storage device (S11), and stores the measurement data in the slave station. The data is stored in the measurement data storage file 22 (S12). When receiving the trigger signal from the master station 4, the external trigger input unit 21 sends the trigger signal to the trigger measurement unit 20 and sends trigger reception time data based on the internal clock to the delay time measurement unit 24. When receiving the trigger occurrence time data transmitted from the master station 4 (S13), the trigger occurrence time receiving unit 23 sends the trigger occurrence time data to the delay time measuring unit 24. When receiving the trigger occurrence time data, the delay time measurement unit 24 reads the transmission delay time measurement data 19 (S14). When the transmission delay time data 19 is completely read, the delay time measurement unit 24 sends the trigger generation time data, the trigger reception time data, and the transmission delay time measurement data to the delay time correction data editing unit 25. When receiving the trigger occurrence time data, the trigger reception time data, and the transmission delay time measurement data, the delay time correction data editing unit 25 edits the measurement data (S15), and the slave station measurement data synchronized with the master station measurement data. Is stored (S16). The editing of slave station measurement data will be described in detail below.

<Time Correction of Measurement Data> FIG. 7 is a processing flow of slave station measurement data performed inside the slave station 8. The underlined portion is the data portion to be edited. First, the trigger reception time data is corrected to a time that is back by the transmission delay time (S17 → S18). Next, by rewriting the sampling time of the slave station measurement data stored in the slave station measurement data storage file 20 so that the corrected trigger reception time coincides with the trigger occurrence time (S18 → S19), the slave station measurement data The time correction (S15) is completed, and the slave station measurement data synchronized with the master station measurement data is stored as the master station synchronization measurement data storage file 23 (S16).

In the first embodiment shown in FIG. 7, the internal clock of the master station 4 is delayed by 2 from the internal clock of the slave station 8, the transmission delay time is 1, and the trigger generation time based on the master station internal clock is 3. Although the case where the trigger reception time based on the slave station internal clock is 6 is shown, the present invention is not limited to these conditions. In the first embodiment, data correction is performed inside the slave station 8, but the present invention is not limited to this example. That is, the measurement data stored in each measuring instrument may be time-corrected separately by a general-purpose personal computer or the like based on the transmission delay time data, trigger generation time data, and trigger reception time data collected by the measurement operator. .

<Configuration of Second Embodiment> A modification of the method for measuring the transmission delay time measured by the master station 4 (hereinafter referred to as the second embodiment) will be described below. The first embodiment described above is an embodiment in which the transmission delay time is measured from the master station 4, but the second embodiment is an embodiment in which the transmission delay time is measured from the slave station 8. According to this, it is not necessary to transmit the transmission delay time from the master station 4 to the slave station 8. As in the first embodiment, the following configuration is an example, and the present invention is not limited to the configuration of the second embodiment.

The slave station 8 includes an elapsed time counter in addition to the configuration of the first embodiment. Other configurations according to the second embodiment are the same as those in the first embodiment.

<Processing Flow> The procedure for using the multipoint measurement system according to the second embodiment will be described below.

<Measurement of transmission delay time> The measurement operator activates the measuring devices of the master station 4 and the slave station 8, respectively. Next, a transmission delay time measurement switch provided at the input unit of the slave station 8 is pressed. When the transmission delay time measurement switch is pressed, the slave station 8 transmits a transmission delay time measurement signal from the slave station 8 to the master station 4 and starts an elapsed time counter synchronized with the internal clock. When receiving the transmission delay time measurement signal, the master station 4 immediately returns the transmission delay time measurement signal to the slave station 8 from the external trigger output unit 15. When the slave station 8 receives the transmission delay time measurement signal returned from the master station 4, the slave station 8 stops the elapsed time counter. Next, the transmission delay time required when the trigger signal is transmitted from the master station to the slave station by dividing the elapsed time based on the value of the elapsed time counter (corresponding to the time (ΔT) of the present invention) by 2. , And the transmission delay time is stored as transmission delay time measurement data 19. When measuring the transmission delay time, if the internal processing time of the master station or slave station cannot be ignored, the value obtained by subtracting the internal processing time of the master station or slave station from the elapsed time based on the value of the elapsed time counter is 2. It is desirable to divide and obtain the transmission delay time required when the trigger signal is transmitted from the master station to the slave station.

After the measurement of the transmission delay time is completed, synchronized multipoint measurement data can be acquired by the same procedure as that of the first embodiment.

<Configuration of Embodiment 3> A modification of the time correction method of slave station measurement data corrected by the slave station 8 (hereinafter referred to as Embodiment 3) will be described below. In the first and second embodiments, the sampling time of the slave station measurement data is corrected in the slave station 8, but in the third embodiment, the slave station measurement is performed by a general-purpose personal computer provided elsewhere. This is an embodiment for correcting the sampling time of data. According to this, even when the transmission delay time and the trigger occurrence time cannot be communicated from the master station 4 to the slave station 8, the measurement data of each station can be synchronized. Similar to the first and second embodiments described above, the following configuration is an exemplification, and the present invention is not limited to the configuration of the third embodiment.

The multipoint measurement system includes a general-purpose personal computer in addition to the configuration of the first or second embodiment. Other configurations according to the third embodiment are the same as those in the first or second embodiment.

<Processing Flow> The procedure for using the multipoint measurement system according to the third embodiment will be described below. Until <time correction of measurement data>, the multipoint measurement data is acquired by the same procedure as that of the first or second embodiment. In the third embodiment, it is assumed that the transmission delay time and the trigger occurrence time are not communicated from the master station 4 to the slave station 8. Therefore, the multipoint measurement data is not yet synchronized at this stage.

<Time correction of measurement data> The measurement operator sends trigger generation time data, trigger reception time data, transmission delay time data, master station measurement data, slave station from each measuring instrument of the master station 4 and slave station 8. Collect measurement data. Next, time correction of these measurement data is performed with a general-purpose personal computer. The method of time correction of measurement data is the same as the above-described <Time correction of measurement data>. Thereby, synchronized multipoint measurement data can be acquired.

<Effects of Embodiments 1, 2, and 3> As described above, the present invention can easily acquire measurement data having synchronism among multiple measurement points even at measurement points where GPS satellite radio waves cannot be received.

Even when the transmission delay time and the trigger occurrence time cannot be communicated, the synchronization of multipoint measurement can be achieved if only the trigger signal can be communicated. For example, it is relatively simple like power line communication using an existing power line. With a simple communication line, it is possible to easily acquire measurement data that is synchronized between multiple measurement points.

In addition, since general-purpose measuring instruments and data editing equipment can be used, it is possible to perform synchronized multipoint measurement at an extremely low cost, and the internal clock between the measuring instruments is not synchronized at all. Can also start measuring work. In addition, since a general-purpose measuring instrument can be used, trigger generation conditions can be set freely.

It is a figure which shows the main structures of the multipoint measuring system which concerns on a prior art. 1 is a diagram illustrating a main configuration of a multipoint measurement system according to Embodiment 1. FIG. 2 is a diagram illustrating a main configuration of a master station according to Embodiment 1. FIG. 2 is a diagram illustrating a main configuration of a slave station according to Embodiment 1. FIG. It is a figure which shows the processing flow of the main | base station which concerns on Embodiment 1. FIG. It is a figure which shows the processing flow of the sub_station | mobile_unit which concerns on Embodiment 1. FIG. It is a figure which shows an example of slave station measurement data time correction which concerns on Embodiment 1. FIG.

Explanation of symbols

1 Electric wire 4 Master station 5, 9 GPS antenna 8 Slave station 10, communication line

Claims (12)

It has a master station and a slave station,
The master station is
Means for storing the measurement value of the first measurement point in the buffer as master station measurement data;
When the measurement value of the first measurement point satisfies a preset trigger generation condition, the trigger generation time based on the internal clock and the master station measurement data stored in the buffer are stored and the trigger signal is Means for transmitting to the slave station,
The slave station is
Means for storing the measurement value of the second measurement point in the buffer as slave station measurement data;
A multipoint measurement system having means for storing a trigger reception time based on an internal clock when receiving the trigger signal and the slave station measurement data stored in a buffer;
A multipoint measurement system comprising means for correcting the trigger reception time to a time that is back by a transmission delay time, and rewriting the sampling time of the slave station measurement data so that the trigger reception time coincides with the trigger occurrence time. The master station is
Means for transmitting a transmission delay time measurement signal from the master station to the slave station;
Means for measuring a time (ΔT) required for the transmission delay time measurement signal transmitted to the slave station to return to the master station;
The multipoint measurement according to claim 1, further comprising means for acquiring a transmission delay time required when the trigger signal is transmitted from the master station to the slave station by dividing the time (ΔT) by two. system. The slave station is
Means for transmitting a transmission delay time measurement signal from the slave station to the master station;
Means for measuring a time (ΔT) required for the transmission delay time measurement signal transmitted to the master station to return to the slave station;
The multipoint measurement according to claim 1, further comprising means for acquiring a transmission delay time required when the trigger signal is transmitted from the master station to the slave station by dividing the time (ΔT) by two. system. The master station is
Means for notifying the slave station of the transmission delay time and the trigger occurrence time;
The slave station is
The trigger reception time is corrected to a time that is back by the transmission delay time notified from the master station, and the corrected trigger reception time is matched with the trigger occurrence time notified from the master station. The multipoint measurement system according to claim 2, further comprising means for rewriting a sampling time of slave station measurement data. The master station is
Means for notifying the slave station of the trigger occurrence time;
The slave station is
The trigger reception time is corrected to a time that is traced back by the transmission delay time, and the sampling time of the slave station measurement data is set so that the corrected trigger reception time matches the trigger generation time notified from the master station. Further having means for rewriting
The multipoint measurement system according to claim 3. The master station
Storing the measurement value of the first measurement point in the buffer as parent station measurement data;
When the measurement value of the first measurement point satisfies a preset trigger generation condition, the trigger generation time based on the internal clock and the master station measurement data stored in the buffer are stored and the trigger signal is And transmitting to the slave station,
The slave station
Storing the measurement value of the second measurement point in the buffer as slave station measurement data;
Executing the step of storing the trigger reception time based on the internal clock when the trigger signal is received and the slave station measurement data accumulated in the buffer;
Multipoint measurement system
A multi-point measurement method, wherein the trigger reception time is corrected to a time that is traced back by a transmission delay time, and the step of rewriting the sampling time of the slave station measurement data so that the trigger reception time coincides with the trigger occurrence time . The master station
Transmitting a transmission delay time measurement signal from the master station to the slave station;
Measuring a time (ΔT) required for the transmission delay time measurement signal transmitted to the slave station to return to the master station;
Further obtaining a transmission delay time required for the trigger signal to be transmitted from the master station to the slave station by dividing the time (ΔT) by 2;
The multipoint measurement method according to claim 6. The slave station is
Transmitting a transmission delay time measurement signal from the slave station to the master station;
Measuring the time (ΔT) required for the transmission delay time measurement signal transmitted to the master station to return to the slave station;
Further obtaining a transmission delay time required for the trigger signal to be transmitted from the master station to the slave station by dividing the time (ΔT) by 2;
The multipoint measurement method according to claim 6. The master station
Further executing the step of notifying the slave station of the transmission delay time and the trigger occurrence time, the slave station,
The trigger reception time is corrected to a time that is back by the transmission delay time notified from the master station, and the corrected trigger reception time is matched with the trigger occurrence time notified from the master station. The multipoint measurement method according to claim 7, further comprising the step of rewriting a sampling time of slave station measurement data. The master station
Further executing the step of notifying the slave station of the trigger occurrence time,
The slave station is
The trigger reception time is corrected to a time that is traced back by the transmission delay time, and the sampling time of the slave station measurement data is set so that the corrected trigger reception time matches the trigger generation time notified from the master station. The multipoint measurement method according to claim 8, further comprising executing a step of rewriting. It has a master station and a slave station,
The master station is
Means for storing the measurement value of the first measurement point as master station measurement data;
Means for storing a trigger generation time based on an internal clock when the measurement value of the first measurement point satisfies a preset trigger generation condition and transmitting a trigger signal to each slave station;
The slave station is
Means for storing the measurement value of the second measurement point as slave station measurement data;
A multipoint measurement system having means for storing a trigger reception time based on an internal clock when the trigger signal is received,
A multipoint measurement system comprising means for correcting the trigger reception time to a time that is back by a transmission delay time, and rewriting the sampling time of the slave station measurement data so that the trigger reception time coincides with the trigger occurrence time. The master station
Storing the measurement value of the first measurement point as master station measurement data;
Performing a step of storing a trigger generation time based on an internal clock and transmitting a trigger signal to each slave station when a measurement value of the first measurement point satisfies a preset trigger generation condition;
The slave station
Performing a step of storing a measurement value of a second measurement point as slave station measurement data, and a step of storing a trigger reception time based on an internal clock when the trigger signal is received;
Multipoint measurement system
A multi-point measurement method, wherein the trigger reception time is corrected to a time that is traced back by a transmission delay time, and the step of rewriting the sampling time of the slave station measurement data so that the trigger reception time coincides with the trigger occurrence time .

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