SU240101A1 - DEVICE FOR TESTING ELECTRIC MEASURING INSTRUMENTS - Google Patents

Description

This invention relates to the field of electrical measurements.

It is known ycrpoiicTBO for calibration of switch-type electrical measuring instruments, containing two rigidly coupled optoelectronic converters (OEI, in the field of which the appropriate instrument indicator and digitized marks are located, an analyzer of OEP signals and a trace of the device being tested with an output signal the shaft of the engine moving the mobile unit OEP.

However, this device does not provide the required accuracy of verification due to the dynamic error that occurs in the process of continuous tracking of the pointer moving it.

The proposed device differs from the known ones in that it is equipped with a time transducer into the number of pulses, a reversible counter, a clock pulse generator, a stepping motor, and a voltage switch, while the inputs of the time converter to the number of pulses are connected to the output of the analyzer output signals of the converters, and the output to the input of the reversible counter, the output of which is connected to the stepper motor through a clock pulse generator; the output shaft of the engine is connected to a switch; paired; connected to the new device.

Marked features

allow you to fix a dynamic error

due to a full stop signpost over the nove 11oG | mark the scale and thereby increase the accuracy of the measurement.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 - for 1 mnoye location of the calibrated mark of the scale n of the pointer of the instrument being checked.

The device works as follows. In the initial state, the / lia switch is set to / pos. The output signals of the opto-electronic converters of the rolling unit 2 are fed to the analyzer 3.

From the output of the analyzer 3, a pulse, the duration of which is equal to the time interval between the pointer and the scale to be checked, is fed to the input of the following spesghem 4, the electric motor 5 of which switches the switch 6 nanr. supplied to the device being checked, in addition, nepe ieiuaeT indicator of the device being turned on (not shown in the drawing).

After pre-combining the pointer with the scale mark, the switch / is shifted to the // position, as a result of which the tracking system 4 is turned off, and the converter 7 is connected to the analyzer 5 by the interval of the Burden to the number of pulses. With

7 times intervals and the number of pulses are received in succession by two pulses, the durations of which ti and / h are respectively equal to the distance from the leading edge of the pointed mark 8 (Fig. 2) to the leading edge of the pointer 9 and from the trailing edge of the pointer to the trailing edge of the checked mark .

From the output of the transducer 7, a sequence of pulses proportional to the specified durations is fed to a reversible counter 10, which when the first sequence arrives is switched on for addition, and when the second sequence arrives for subtraction.

As a result, the number of pulses in the reversible counter is proportional to the displacement of the axes of symmetry of the pointer and the point being checked.

As long as the number recorded in the reversible counter is different from zero, the generator of 11 clock pulses is turned on, and its output pulses act on the stepper motor 12, which controls the switch 6. The last timed 1, is the pointer of the instrument being checked.

When combining the axes of symmetry of the index and the mark, the number written in reverse

the counter becomes zero, the clock is turned off, and the stepping motor is stopped.

Prevention and Conversation

ycTpoiicTBO for calibration of electrical measuring instruments, containing two optoelectronic transducers forming a moving unit, an output signal analyzer of the transducers and a tracking system moving the movable unit following the indicator of the instrument being tested, characterized in that it is equipped with a time interval transformer into a number of pulses, a reversible counter, a clock pulse generator, a stepper motor, and a voltage switch, while the inputs of the converter are The time intervals in the number of pulses are connected to the output of the analyzer of the output signals of the transducers, and the output to the input of the reversible counter, the output of which is connected to the stepper generator through the clock generator, the output shaft of which

associated with a voltage switch connected to a calibrated instrument.

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