JP2016031288A - Measuring device and measuring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to accurately grasp the state of a change in the value to be measured with regard to the object of measurement.SOLUTION: A measurement device comprises: a measurement unit 11, having a clamp sensor, for measuring the value to be measured with regard to the object of measurement at prescribed time intervals and successively outputting measured value data D0; a memory 17 capable of storing the measured value data D0; a display unit 13 for displaying the result of measurement; a control unit 16 for making the measured value data D0 from the measurement unit 11 successively stored in the memory 17, and also executing a maximum value specification process for specifying a maximum value within a prescribed time of the value to be measured based on the measured value data D0 that is stored and a measurement result display process for making the specified maximum value numerically displayed on the display unit 13 as the result of measurement; and a wireless communication unit 14 and a wire communication unit 15 capable of communicating with a smart phone 2, the control unit 16 executing a data transmission process for making the measured value data D0 stored in the memory 17 transmitted to the smart phone 2 from either of the communication units 14, 15 when a transmission start condition is satisfied.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a measurement apparatus configured to measure a measurement amount of a measurement object by a measurement unit having a clamp sensor capable of clamping the measurement object and display the measurement result on the display unit, and such a measurement apparatus. The present invention relates to a measurement system including a mobile terminal device.

  As this type of measuring device, the applicant has a clamp unit that can clamp the measuring object, and can measure the current value of the current flowing through the measuring object in a non-contact manner with respect to the measuring object (clamp-type measurement). (Apparatus) is disclosed in the following patent document. When measuring current using this current measuring device, the lead wire to be measured is clamped by the clamp unit, and the operation unit is operated to instruct the start of measurement. At this time, the control unit controls the measurement unit to execute the measurement process, and the measurement unit measures the current value of the current flowing through the conducting wire based on the detection signals output from the pair of sensors in the clamp unit. Moreover, a control part displays the electric current value measured by the measurement part on a display part as a numerical value as a measurement result. Thereby, the measurement process about the electric current which flows through the conducting wire of a measuring object is completed.

JP 2011-106976 A (page 5-10, FIG. 1-5)

  However, the current measuring apparatus disclosed by the applicant has the following problems to be improved. That is, in the current measuring device disclosed by the applicant, the current value of the current flowing through the measurement target (conductor) clamped by the clamp unit is measured, and the measurement result (current value) is displayed numerically on the display unit. The configuration is adopted.

  In this case, as one of the usage modes of this type of measuring apparatus, there is measurement of an inrush current flowing through a measurement object. On the other hand, the current measurement device disclosed by the applicant is not only a normal measurement mode in which the measurement result (current value) to be displayed on the display unit is sequentially displayed according to the current value repeatedly measured by the measurement unit, It is possible to execute a measurement process in a peak hold mode that maintains a state in which the maximum current value measured within a predetermined time is displayed on the display unit. Thereby, in the current measuring device disclosed by the applicant, for example, it is possible to measure the maximum value of the inrush current that flows through the power cable when the motor is turned on and to display the value on the display unit numerically. It has become.

  However, when measuring the inrush current flowing through the measurement object, just looking at the maximum value displayed numerically on the display unit, how long the current of such value has flowed, and the maximum value It is not possible to grasp whether a large current of the same level as that has flowed a plurality of times, or whether the maximum current has flowed only once. Therefore, in the current measuring device disclosed by the applicant, it is difficult to accurately grasp in what state the inrush current flows. A similar problem exists in a measurement apparatus configured to display a measurement value such as a voltage value as a measurement result numerically in the same manner as the current measurement apparatus disclosed by the applicant. For this reason, it is preferable to improve this point.

  The present invention has been made in view of such a problem to be improved, and a main object of the present invention is to provide a measuring apparatus and a measuring system that can accurately grasp the state of change in the amount to be measured for a measurement target.

  In order to achieve the above object, the measuring apparatus according to claim 1 includes a clamp sensor capable of clamping the measuring object, and measures a measured amount of the measuring object at a predetermined time interval to obtain measured value data. A measurement unit that sequentially outputs, a storage unit that can store the measurement value data, a display unit that displays measurement results, and the measurement value data output from the measurement unit are sequentially stored in the storage unit, and Based on the measurement value data stored in the storage unit, a maximum value specifying process for specifying the maximum value within a predetermined time of the measurement target for the measurement object, and the specified maximum value as the measurement result A measurement device including a processing unit that executes a measurement result display process for displaying a numerical value on the display unit, the communication device including a communication unit capable of communicating with an external device, wherein the processing unit is defined in advance. When the transmission start condition is satisfied, it executes a data transmission process for transmitting the measurement data stored in the storage unit from the communication unit to the external device.

  A measurement system according to claim 2 is a measurement system including the measurement device according to claim 1 and a portable terminal device as the external device, wherein the measurement device is a first display as the display unit. A first communication unit serving as the communication unit, a first storage unit serving as the storage unit, and a first processing unit serving as the processing unit, wherein the mobile terminal device is capable of displaying a measurement result. A second communication unit capable of communicating with the first communication unit of the measurement device, a second storage unit capable of storing the measurement value data transmitted from the measurement device, and a first communication unit. The measurement value data received by the second communication unit is sequentially stored in the second storage unit, and a graph showing a change in the measured amount for the measurement object based on the measurement value data is displayed on the second display unit To display And a second processing unit that performs the graph display processing.

  In the measuring apparatus according to claim 1, the processing unit sequentially stores measurement value data of the measurement amount for the measurement target measured by the measurement unit having the clamp sensor in the storage unit, and the measurement amount is defined in advance. A maximum value specifying process for specifying the maximum value within a specified time based on the measured value data, and a measurement result display process for displaying the specified maximum value as a measurement result on the display unit, and a predetermined transmission start. When the condition is satisfied, a data transmission process for transmitting the measurement value data stored in the storage unit from the communication unit to the external device is executed.

  The measurement system according to claim 2 includes a measurement device and a portable terminal device, and the second processing unit of the portable terminal device transmits the second measurement value data transmitted from the measurement device and received by the second communication unit. A graph display process is executed for sequentially storing the data in the storage unit and displaying a graph indicating a change in the measured amount for the measurement target on the second display unit based on the measurement value data.

  Therefore, according to the measurement device according to claim 1 and the measurement system according to claim 2, the graph displayed on the second display unit of the mobile terminal device is viewed based on the measurement value data transmitted from the measurement device. Thus, it is possible to accurately grasp how the value of the measured amount measured by the measuring unit of the measuring device has changed. Moreover, since it is not necessary to mount a display unit having a large size capable of displaying a graph in the measuring apparatus, it is possible to suitably avoid a situation in which the measuring apparatus is enlarged.

1 is a block diagram showing a configuration of a measurement system 100. FIG. 1 is an external view of a measurement device 1 and a smartphone 2 in a measurement system 100. FIG.

  Hereinafter, embodiments of a measurement apparatus and a measurement system will be described with reference to the accompanying drawings.

  The measurement system 100 illustrated in FIGS. 1 and 2 is an example of a “measurement system”, and includes a measurement device 1 and a smartphone 2. In this case, the “smart phone” broadly means a mobile phone having a PDA (personal digital assistant) function. In this specification, the “smart phone” in the broad sense means “by installing various programs”. "Those that can add arbitrary functions or customize the operating environment or display environment of the terminal" are called "smartphones". The smartphone 2 is an example of a “portable terminal device”, and is configured by an existing “smart phone” in which a measurement system program Dp dedicated to the measurement system 100 is installed, as will be described later.

  The measuring device 1 is a clamp-type current measuring device that is an example of a “measuring device”. As shown in FIG. 1, the measuring unit 11, the operation unit 12, the display unit 13, the wireless communication unit 14, and the wired communication unit 15. The control unit 16 and the memory 17 are provided. The measurement unit 11 is an example of a “measurement unit”, and includes a clamp sensor unit 11a that is an example of a “clamp sensor that can clamp a measurement target” as illustrated in FIG. Under the control of the control unit 16, the measurement unit 11 samples a current value (an example of “amount to be measured”) of a current flowing through a measurement target (not shown) clamped by the clamp sensor unit 11 a at a preset sampling cycle. (An example of a configuration of “Measure the measured amount at a predetermined time interval”) The measurement value data D0 (an example of “measurement value data”) is sequentially output to the control unit 16.

  The operation unit 12 is a changeover switch for switching the measurement mode, and a HOLD switch for holding / releasing the measurement result displayed on the display unit 13 (restriction of display change of measurement value and release of restriction). The operation signal corresponding to the switch operation is output to the control unit 16. The display unit 13 is an example of a “first display unit” as a “display unit”, and displays an effective value indicating an effective value of a current flowing through a measurement target as illustrated in FIG. 31a or a measurement result display 31 such as a maximum value display 31b indicating a maximum value within a predetermined time (maximum current value: maximum peak value, which is the larger one of the absolute values of ±) is displayed. .

  In this case, since the “measuring device” having the “clamp sensor (clamp sensor unit 11a)” like the above-described measuring device 1 needs to hold the device in the hand and clamp the measuring object with the “clamp sensor”, It needs to be sufficiently downsized. For this reason, also in the measurement apparatus 1 described above, a large-sized “display unit” that can display a large amount of information cannot be mounted, and a small display unit 13 that does not increase the size of the apparatus is mounted. Yes. Therefore, in the measurement apparatus 1 (measurement system 100) of this example, as described later, the display unit 13 of the measurement apparatus 1 simply displays a measurement result as a numerical value, and a “waveform (graph) that requires a wide display area. For “)”, a configuration of displaying on the smartphone 2 is adopted.

  As an example, the wireless communication unit 14 is configured to be capable of performing short-range wireless communication in accordance with the Bluetooth (registered trademark) standard, and various types of wireless communication unit 14 are paired with the smartphone 2 as described later. Send and receive signals and data. Further, as an example, the wired communication unit 15 includes a connection connector (not shown) conforming to the USB standard, and can be connected to the smartphone 2 via a signal cable C (see FIG. 1) connected to the connection connector. It is configured to transmit / receive various signals and data via the signal cable C. In this case, in the measurement apparatus 1 (measurement system 100) of this example, the wireless communication unit 14 and the wired communication unit 15 correspond to the “first communication unit” as the “communication unit”, and the smartphone is operated according to the control of the control unit 16. 2, a process for receiving the transmission request signal S transmitted from 2 and a process for transmitting the measurement value data D0 and the measurement result data D1 to the smartphone 2 are executed.

  The control unit 16 corresponds to a “first processing unit” as a “processing unit”, and comprehensively controls the measuring apparatus 1. Specifically, the control unit 16 controls the measurement unit 11 according to the selected measurement mode, thereby measuring the current value of the current flowing through the measurement target clamped by the clamp sensor unit 11a and measuring the current. The measured value data D0 output from the unit 11 is sequentially stored in the memory 17. Further, the control unit 16 generates measurement result data D1 by specifying a measurement result corresponding to the selected measurement mode based on the measurement value data D0 stored in the memory 17, and generates the measurement result data D1. Storage in the memory 17 and display of the measurement result on the display unit 13 based on the measurement result data D1 are executed.

  Furthermore, as an example, the control unit 16 transmits a transmission request signal S from the smartphone 2 and includes measurement value data D0 to be transmitted to the smartphone 2 as described later (“predetermined transmission start condition” The measurement value data D0 and the measurement result data D1 stored in the memory 17 are transmitted from the wireless communication unit 14 or the wired communication unit 15 to the smartphone 2. In this example, the process of transmitting the measurement value data D0 from the wireless communication unit 14 or the wired communication unit 15 to the smartphone 2 corresponds to a “data transmission process”. The memory 17 corresponds to a “first storage unit” as a “storage unit”, and temporarily stores the calculation result of the control unit 16, the measurement value data D0, the measurement result data D1, and the like.

  In this case, in the measurement apparatus 1 (measurement system 100) of this example, as will be described later, a normal direct current measurement mode for measuring the current value of the direct current flowing through the measurement object and the alternating current flowing through the measurement object. In addition to the measurement processing in the normal AC current measurement mode that measures the current value of the current, the DC inrush current measurement mode that measures the DC inrush current, and the AC inrush current measurement mode that measures the AC inrush current (hereinafter, When these measurement modes are not distinguished from each other, the measurement process in the “inrush current measurement mode”) can be executed.

  In the measurement apparatus 1 (measurement system 100) of this example, as will be described later, when the inrush current measurement mode is selected, the control unit 16 is based on the measurement value data D0 output from the measurement unit 11. The “maximum value specifying process” for specifying the maximum current value (maximum value) measured within a predetermined time and the “effective value specifying process” for specifying the effective value are executed to obtain the measurement result data D1. Generate. Further, the control unit 16 stores the generated measurement result data D1 in the memory 17, and, as shown in FIG. 2, the measurement result display 31 such as the effective value display 31a and the maximum value display 31b based on the measurement result data D1. Is displayed on the display unit 13. In the measurement apparatus 1 (measurement system 100), the process of displaying the maximum value display 31b on the display unit 13 corresponds to the “measurement result display process of displaying the specified maximum value as a measurement result on the display unit as a numerical value”.

  On the other hand, the smartphone 2 is an example of a “mobile communication terminal” as an “external device”, and as described above, is configured by an existing “smartphone” in which the measurement system program Dp is installed. Specifically, as shown in FIG. 1, the smartphone 2 includes a main body memory 21, an operation unit 22, a display unit 23, a wireless communication unit 24, a wired communication unit 25, a control unit 26, and a storage memory mounting unit 27. It is configured. In addition, since the component for implement | achieving "the function as a mobile telephone" in the smart phone 2 or the "function as PDA" is well-known, illustration and description are abbreviate | omitted.

  The main body memory 21 stores an operation program of the smartphone 2, and various programs (programs installed by the user) such as the measurement system program Dp, measurement value data D0 transmitted from the measurement device 1 as described later, and Various data such as measurement result data D1 are stored. A part of the program such as the measurement system program Dp, the measurement value data D0, the measurement result data D1, and the like can be installed in the storage memory M attached to the storage memory attachment unit 27. In this case, in the smartphone 2 (measurement system 100) of this example, the storage memory M mounted on the main body memory 21 and the storage memory mounting unit 27 corresponds to the “second storage unit”.

  The operation unit 22 includes a touch panel disposed on the surface side of the display unit 23 in addition to a power switch (not shown) and outputs operation signals corresponding to these operations to the control unit 26. The display unit 23 is an example of a “second display unit”, and displays various display screens under the control of the control unit 26. In this case, in the smartphone 2 (measurement system 100) of this example, when the measurement system program Dp is started as described later, the measurement processing screen 40 is displayed on the display unit 23 as shown in FIG. The

  On the measurement processing screen 40, as an example, the measurement result display 41 based on the measurement value data D0 and the measurement result data D1 transmitted from the measurement apparatus 1, hold of the measurement result display 41, and release of the hold (display change). HOLD switch for performing regulation and cancellation of regulation), and various types of SAVE switch for instructing execution of data storage processing for storing the latest measured value data D0 and measurement result data D1 in the storage area of the main body memory 21 An operation switch (a pseudo switch that can be operated via the touch panel) is displayed. The measurement result display 41 includes an effective value display 41a indicating an effective value specified based on the measurement result data D1, a maximum value display 41b indicating a maximum value specified based on the measurement result data D1, and measured value data. It is composed of a waveform display 41c (an example of a “graph showing a change in measured amount”) drawn based on D0.

  The wireless communication unit 24 is configured to be capable of performing short-range wireless communication in accordance with the Bluetooth standard in the same manner as the wireless communication unit 14 of the measurement device 1 and is paired with the measurement device 1 as described later. Various signals and data are transmitted and received in a live state. In addition, the wired communication unit 25 includes a connection connector conforming to the USB standard in the same manner as the wired communication unit 15 of the measurement apparatus 1 and can be connected to the measurement apparatus 1 via a signal cable C connected to the connection connector. Configured to transmit and receive various signals and data via the signal cable C. In this case, in the smartphone 2 (measurement system 100) of this example, the wireless communication unit 24 and the wired communication unit 25 correspond to the “second communication unit”, and the transmission request signal S to the measurement apparatus 1 is controlled according to the control of the control unit 26. And the reception processing of the measurement value data D0 and the measurement result data D1 transmitted from the measurement apparatus 1 are executed.

  The control unit 26 is an example of a “second processing unit”, and comprehensively controls the smartphone 2. Specifically, the control unit 26 displays the measurement processing screen 40 on the display unit 23 according to the measurement system program Dp, and transmits a transmission request signal to the measurement apparatus 1 via the wireless communication unit 24 or the wired communication unit 25. A process of transmitting S is executed. In addition, when the measurement value data D0 and the measurement result data D1 are received by the wireless communication unit 24 or the wired communication unit 25, the control unit 26 stores the received measurement value data D0 and the measurement result data D1 in the main body memory 21. Store sequentially. Further, the control unit 26 displays the effective value display 41a and the maximum value display 41b on the measurement processing screen 40 based on the measurement result data D1, and also displays the waveform display 41c on the measurement processing screen 40 based on the measurement value data D0. Is displayed. In the smartphone 2 (measurement system 100) of this example, the process in which the control unit 26 displays the waveform display 41c on the display unit 23 (measurement processing screen 40) based on the measurement value data D0 is “graph display process”. Equivalent to.

  The measurement system program Dp installed in the smartphone 2 is transmitted to the control unit 26 from the measurement device 1 (the wireless communication unit 14 or the wired communication unit 15), and the wireless communication unit 24 or the wired communication unit. The measurement value data D0 and the measurement result data D1 received by the control unit 25 are sequentially stored in the main body memory 21 (or the storage memory M), and the effective value display 41a and the maximum value display 41b are displayed on the display unit based on the measurement result data D1. The procedure for executing the process of displaying on the waveform display 41c display unit 23 (measurement processing screen 40) indicating the change in the current flowing through the measurement object based on the measurement value data D0. Is recorded.

  In using the measurement system 100, first, the measurement system program Dp is installed in the smartphone 2. As an example of the measurement system program Dp, an installation optical disk can be provided as an accessory of the measurement apparatus 1, or can be downloaded from an arbitrary site on the Internet and used. Note that the installation work of the measurement system program Dp is the same as the installation work of various programs for the “smartphone”, and thus detailed description thereof is omitted. Next, Bluetooth pairing is performed between the measuring device 1 and the smartphone 2. Since the pairing work is the same as the pairing work of various known Bluetooth devices, detailed description is omitted. Thereby, the measurement system 100 is ready for use.

  Next, for example, when measuring an inrush current of alternating current flowing through a power cable as a measurement target, first, the operation unit 12 of the measurement apparatus 1 is controlled to set conditions for measurement processing. At this time, the measurement process is set to be executed in the AC inrush current measurement mode. In practice, the measurement range is manually selected for each selected measurement mode or a setting operation for automatically selecting the measurement range is performed. However, it is easy to understand the operation principle of the measurement apparatus 1 (measurement system 100). Therefore, the description related to the selection of the measurement range is omitted. Subsequently, the operation unit 22 of the smartphone 2 is operated, and as an example, the wireless communication unit 24 is turned on (set to a communicable state). At this time, the wireless communication unit 14 of the measuring apparatus 1 and the wireless communication unit 24 of the smartphone 2 paired by the above-described pairing work are in a state where they can communicate with each other.

  Next, the operation unit 22 is operated to start the measurement system program Dp. At this time, the control unit 26 causes the display unit 23 to display the measurement processing screen 40 in accordance with the measurement system program Dp. At this point in time when the measurement process by the measurement device 1 has not started (as described later, the measurement value data D0 and the measurement result data D1 are not transmitted from the measurement device 1), the measurement process screen of the smartphone 2 is displayed. In 40, an effective value display 41a of "0.0A", a maximum value display 41b of "0A", and a waveform display 41c without a line segment indicating the waveform are displayed (not shown). Further, as an example, the control unit 26 controls the wireless communication unit 24 when the measurement processing screen 40 is displayed according to the measurement system program Dp, so that the measurement device 1 can measure the measured value data D0 and the measurement result. A transmission request signal S for requesting transmission of data D1 (a signal for informing that reception of measurement value data D0 and measurement result data D1 is ready) is transmitted.

  Subsequently, the start of the measurement process is instructed by a switch operation (process start operation) of the operation unit 12 in the measurement apparatus 1, and the power supply cable in a state where no current is supplied is clamped by the clamp sensor unit 11a. At this time, the control unit 16 controls the measurement unit 11 to start a current value measurement process, and the value (absolute value) of the measurement value data D0 output from the measurement unit 11 is defined in advance. Monitoring is started as to whether or not a value (as an example, ± 5 A) is exceeded. On the other hand, the measurement unit 11 performs a current value measurement process at the set sampling period, and outputs measurement value data D0 having a value of “0A” each time. In addition, the control unit 16 sequentially stores the measurement value data D0 output from the measurement unit 11 in the memory 17, and the value of the measurement value data D0 does not exceed the threshold value (the supply of alternating current to the measurement target is not performed). The effective value display 31a of “0.0A” and the maximum value display 31b of “0A” are displayed (not shown).

  Next, supply of alternating current to the power cable clamped by the clamp sensor unit 11a of the measuring apparatus 1 is started. At this time, the current value of the alternating current flowing through the power cable is sequentially measured by the measurement unit 11 and the measurement value data D0 is output, and the control unit 16 outputs the measurement value data D0 from the measurement unit 11, The measured value data D0 is stored in the memory 17. Further, the control unit 16 (when the value of the measurement value data D0 exceeds the threshold value (that is, when the supply of the alternating current to the power cable is started) has passed 100 milliseconds (“predefined”). In the example of “100 ms”, the measurement unit 11 is controlled to finish the current value measurement process and output from the measurement unit 11 during 100 milliseconds before the measurement process is terminated. Based on the measured value data D0, a process of specifying “effective value” and “maximum value” is executed. As a result, the maximum value and the effective value within 100 milliseconds flowing through the power cable are respectively specified by the control unit 16, and the measurement result data D1 is generated. The “predetermined time” can be specified at any time other than “100 milliseconds”.

  Next, the control unit 16 stores the generated measurement result data D1 in the memory 17 and, as shown in FIG. 2, a character indicating an effective value (for example, “95.8A”) based on the measurement result data D1. The effective value display 31a is changed in the column, and the maximum value display 31b is changed in the character string indicating the maximum value (for example, “−263A”) (“the specified maximum value is numerically displayed on the display unit as the measurement result”). An example of the process of “display”). As a result, the user who has seen the effective value display 31a and the maximum value display 31b displayed on the display unit 13 of the measuring apparatus 1 can detect the AC inrush current flowing through the power cable clamped by the clamp sensor unit 11a. It is recognized that the effective value is “95.8A” and the maximum value is “−263A”.

  At this time, the transmission request signal S transmitted from the smartphone 2 is received by the wireless communication unit 24, and measurement value data D0 to be transmitted to the smartphone 2 exists (stored in the memory 17). Therefore, as an example, the control unit 16 determines that the value of the measured value data D0 is a threshold value for 120 milliseconds before the time when the measurement process is finished (for 100 milliseconds before the time when the measurement process is finished). Measurement value data D0 output from the measurement unit 11 and measurement result data D1 are read out from the memory 17 and transferred from the wireless communication unit 14 to the smartphone 2. Send it.

  In response to this, in the smartphone 2, the control unit 26 stores the measurement value data D0 and the measurement result data D1 received by the wireless communication unit 24 in the main body memory 21, and as shown in FIG. Based on D1, the effective value display 41a is changed to the value “95.8A”, and the maximum value display 41b is changed to the value “−263A”. Further, the control unit 26 displays a waveform indicating a change in the current value measured by the measurement unit 11 on the measurement processing screen 40 as the waveform display 41c based on the measurement value data D0. Thereby, the user who saw the measurement result display 41 displayed on the display unit 23 (measurement processing screen 40) of the smartphone 2 has passed through the power cable clamped by the clamp sensor unit 11a of the measuring device 1. The inrush current has an effective value of “95.8A” and a maximum value of “−263A”, and when such an effective value and a maximum value are measured, the current flowing through the power cable Is accurately grasped based on the waveform display 41c. This completes the measurement process for the AC inrush current.

  Further, in conjunction with the measurement process by the measurement apparatus 1 (immediately after the measurement process by the measurement apparatus 1 is completed), the measurement result display 41 indicating the measurement result of the measurement process is displayed on the display unit 23 (measurement process screen) of the smartphone 2. 40), the measurement system 100 has been described. However, in the measurement system 100, after a series of measurement processes by the measurement apparatus 1 is completed (measurement value data D0 and measurement result data D1 are stored in the memory 17). As long as it is, the user can display the measurement result display 41 on the display unit 23 (measurement processing screen 40) of the smartphone 2 at an arbitrary timing. Specifically, in a state where the measurement process of the inrush current by the measurement device 1 is completed, for example, a state in which wireless communication is possible between the wireless communication unit 14 of the measurement device 1 and the wireless communication unit 24 of the smartphone 2 In addition, the measurement system program Dp is activated on the smartphone 2. At this time, the display unit 23 of the smartphone 2 includes an effective value display 41a of “0.0A”, a maximum value display 41b of “0A”, and a waveform display 41c in a state where no line segment indicating the waveform exists. The measurement result display 41 is displayed on the measurement processing screen 40.

  Next, the smartphone 2 is operated to display a submenu (not shown) on the display unit 23, and the execution of processing for requesting the measurement apparatus 1 to transmit the measurement value data D0 and the measurement result data D1 is selected. At this time, the control unit 26 causes the wireless communication unit 24 to transmit the transmission request signal S to the measuring device 1 in accordance with the selection operation. Further, in the measurement apparatus 1, when the transmission request signal S transmitted from the smartphone 2 is received by the wireless communication unit 14, the control unit 16 determines that the “transmission start condition” is satisfied and stores it in the memory 17. The measured value data D0 and measurement result data D1 that have been transmitted are transmitted from the wireless communication unit 14 to the smartphone 2.

  In response to this, in the smartphone 2, the control unit 26 stores the measurement value data D0 and the measurement result data D1 transmitted from the measurement device 1 and received by the wireless communication unit 24 in the main body memory 21, and the measurement result data. Based on D1, for example, the effective value display 41a is changed to a value of “95.8A”, the maximum value display 41b is changed to a value of “−263A”, and measurement is performed based on the measured value data D0. A waveform indicating a change in the current value measured by the unit 11 is displayed on the measurement processing screen 40 as a waveform display 41c. Accordingly, the user who has seen the measurement result display 41 displayed on the display unit 23 (measurement processing screen 40) of the smartphone 2 has an effective value of the AC inrush current flowing through the power cable to be measured of “95. 8A ”and the maximum value is“ −263A ”and how the current value of the current flowing through the power cable has changed when such effective value and maximum value are measured. Can be accurately and easily grasped based on the waveform display 41c.

  In addition, although the usage method of transmitting and receiving various signals and data such as the transmission request signal S, the measurement value data D0, and the measurement result data D1 by wireless communication between the wireless communication units 14 and 24 has been described as an example, In the measurement system 100, various signals and data can be transmitted and received between the measurement device 1 and the smartphone 2 via the signal cable C in a state where the wired communication units 15 and 25 are connected by the signal cable C. As described above, when the transmission / reception is performed via the signal cable C, the measurement apparatus 1 and the smartphone 2 perform the same processes as the above-described processes.

  As described above, in the measurement apparatus 1, the control unit 16 measures the measured amount (the current value of the current flowing through the measurement target) for the measurement target measured by the measurement unit 11 having the clamp sensor. The data D0 is sequentially stored in the memory 17, and the “maximum value specifying process” for specifying the maximum value within a predetermined time based on the measured value data D0 and the maximum value display 31b indicating the specified maximum value are displayed. When the “measurement result display process” for causing the unit 13 to display a numerical value is executed and the transmission start condition defined in advance is satisfied (in this example, when the transmission request signal S is transmitted from the smartphone 2), the memory The “data transmission process” is executed in which the measured value data D0 stored in the wireless communication unit 14 or the wired communication unit 15 is transmitted from the wireless communication unit 14 to the smartphone 2.

  In addition, the measurement system 100 includes the measurement device 1 and the smartphone 2, and the control unit 26 of the smartphone 2 receives the measurement value data D0 transmitted from the measurement device 1 and received by the wireless communication unit 24 or the wired communication unit 25. A “graph display process” in which the waveform display 41c (graph) indicating the change in the measured amount for the measurement target is displayed on the display unit 23 based on the measured value data D0 while being sequentially stored in the main body memory 21 (or the storage memory M). ”Is executed.

  Therefore, according to the measurement device 1 and the measurement system 100, the waveform display 41c displayed on the display unit 23 (measurement processing screen 40) of the smartphone 2 is viewed based on the measurement value data D0 transmitted from the measurement device 1. Thus, it is possible to accurately grasp how the current value of the current measured by the measuring unit 11 of the measuring device 1 has changed. In addition, since it is not necessary to mount a large-sized “display unit” capable of displaying “waveform (graph)” on the measuring apparatus 1, it is possible to suitably avoid a situation in which the measuring apparatus 1 is enlarged.

  Note that the configurations of the “measurement device” and the “measurement system” are not limited to the examples of the measurement device 1 and the measurement system 100 described above. For example, the example in which the effective value is specified together with the maximum value of the current flowing through the measurement target and the effective value display 31a is displayed on the display unit 13 has been described, but a configuration in which the effective value is not specified and displayed may be adopted. it can. Moreover, the structure which displays the waveform display 41c, without displaying both or one of the effective value display 41a and the maximum value display 41b on the display part 23 (measurement process screen 40) of the smart phone 2 is also employable. In addition, the configuration for measuring the current value as the “measurement amount” has been described as an example, but the configuration for measuring various electrical parameters such as the voltage value, resistance value, and power value as the “measurement amount” is adopted. You can also

  The “transmission start condition” is not limited to the above example of “when the transmission request signal S is transmitted from the smartphone 2 and the measurement value data D0 to be transmitted to the smartphone 2 exists”. “When a predetermined time has elapsed since the start of the measurement process”, “When a predetermined number of measurement value data D0 (for a predetermined time) has been output from the measurement unit 11”, and Various conditions such as “when measurement process is completed” can be defined. Furthermore, regarding the “graph indicating the change in the amount to be measured”, various “graphs” such as “line graph”, “bar graph”, and “pie graph” can be displayed on the “portable terminal device”.

  In addition, the configuration in which various signals and data such as the transmission request signal S, the measurement value data D0, and the measurement result data D1 are transmitted and received by short-range wireless communication according to the Bluetooth standard has been described as an example. Instead of (or in addition to) the configuration, a wireless communication unit that can be connected to a wireless LAN, a wireless communication unit that can perform short-range wireless communication according to the ZigBee (registered trademark) standard, and a configuration that conforms to the IrDA standard A configuration in which a wireless communication unit capable of performing infrared communication is provided to transmit and receive various signals and data can also be employed.

  Further, the configuration for transmitting and receiving various signals and data between the wired communication units 15 and 25 having the connection connector conforming to the USB standard has been described as an example, but instead of such a configuration (or this configuration) In addition, it is also possible to adopt a configuration in which various signals and data are transmitted and received according to various wired communication standards conforming to the IEEE488 standard, the IEEE1394 standard, or the like. Furthermore, the communication means between the measuring apparatus 1 and the smartphone 2 is not limited to short-range wireless communication or wired communication, but can also use long-distance communication using a public line network, Internet communication network, or the like.

  In addition, the “portable terminal device” is not limited to the “smartphone”, and the “measurement system program” can be installed on the “tablet terminal” or “notebook personal computer” to be used as the “portable terminal device”. it can.

DESCRIPTION OF SYMBOLS 100 Measuring system 1 Measuring apparatus 2 Smartphone 11 Measuring part 11a Clamp sensor part 12, 22 Operation part 13, 23 Display part 14, 24 Wireless communication part 15, 25 Wired communication part 16, 26 Control part 17 Memory 21 Main body memory 27 Storage memory Attached part 31, 41 Measurement result display 31a, 41a RMS value display 31b, 41b Maximum value display 40 Measurement processing screen 41c Waveform display C Signal cable D0 Measurement value data D1 Measurement result data Dp Measurement system program M Storage memory S Transmission request signal

Claims (2)

A measurement unit that has a clamp sensor capable of clamping a measurement object, measures a measurement amount of the measurement object at a predetermined time interval, and sequentially outputs measurement value data;
A storage unit capable of storing the measurement value data;
A display for displaying the measurement results;
The measurement value data output from the measurement unit is sequentially stored in the storage unit, and based on the measurement value data stored in the storage unit, the measurement amount for the measurement target is within a predetermined time. And a processing unit that executes a maximum value specifying process for specifying the maximum value in and a measurement result display process for displaying the specified maximum value as the measurement result on the display unit as a numerical value,
It has a communication unit that can communicate with external devices,
The processing unit executes a data transmission process for transmitting the measurement value data stored in the storage unit from the communication unit to the external device when a predetermined transmission start condition is satisfied. . A measurement system comprising the measurement device according to claim 1 and a portable terminal device as the external device,
The measurement apparatus includes a first display unit as the display unit, a first communication unit as the communication unit, a first storage unit as the storage unit, and a first processing unit as the processing unit,
The portable terminal device can store a second display unit capable of displaying a measurement result, a second communication unit capable of communicating with the first communication unit of the measurement device, and the measurement value data transmitted from the measurement device. The measurement value data transmitted from the second storage unit and the first communication unit and received by the second communication unit are sequentially stored in the second storage unit, and the measurement target is determined based on the measurement value data. A measurement system comprising a second processing unit that executes a graph display process for displaying a graph indicating a change in the amount to be measured on the second display unit.

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