SU107455A1 - Meter Tester - Google Patents

Description

In order to check electric meters in a wide range of loads in the process of adjustment, it is necessary to have measuring devices that would allow automatically and with great accuracy for 1-2 disk turns to determine the value n sign of tolerance by means of a reference counter.

For this purpose, various devices have been proposed, in which the error of the counter being tested, expressed by a certain integer number of pulses, accumulates over any integer number of revolutions of the counter disk and is fed to an error indicator, which can be a pulse counter (electromechanical, electronic, magnetic) or str. ; Accurate instrument (millikulukonometr).

The device allows simultaneous testing of several counters on a single reference over a wide load range.

However, in known devices of this kind, indicator and counting devices must be designed for large capacity, so

how it is necessary to count a large number of pulses (100-500), coming from the sensor of the reference counter. This naturally impairs the metrological qualities of the device and reduces the durability of the counting nodes.

To eliminate this drawback, the proposed device is designed in such a way that the error indicator counts only the pulses that directly characterize the value of the error of the test meter. If the error of the counter under test compared to the reference one is zero, then the pulses supplied by the reference instrument sensor are not counted.

These meters achieve an unambiguity, the readings of the indicator device with any error of the test instrument, the metrological qualities of the entire measuring and installation increase (the probability of miscalculation of pulses decreases), the capacity of the indicator and counting devices decreases, and their durability increases.

The drawing shows a schematic diagram of the proposed device.

The device uses a reference counter with a disk / equipped with apertures through which light rays can pass from the source 2 of the crust to the sensitive element 3 of the photoelectric sensor. This sensor is turned on through the amplifier 1 mpulse Up and switch the BC on the error indicator And, the arrow of which deviates to the ANGLE, proportional to the number of arriving pulses.

A drum 4 is also mounted on the reference axis axis, on the surface of which a number of tracks 5 are recorded for magnetic recording. On each track are two magnetic heads. One of them, Universal Head 6 serves to lower the signals from the special Fi generator through the BKi switch, and to play the recorded, signals that are used to close the BC key switch at the same time as the error indicator. The second head 7 is designed to erase the record after each measurement of the checked counter and is connected to the generator A through the switch .B / Co.

The switch BK is controlled by signals from the photoelectric sensor 8, the checked counter 9 through the amplifier Dz and the cascade KU. In addition, it is affected by the signals of the magnetic head 6 through the amplifier Y.

The switch of the ACU to the circuit of the universal head 6 at the time of recording closes with a pulse removed from the sensor 8 of the counter being tested. Switching off the PCG in the circuit of the erasing magnetic head 7 is also controlled by the signals taken from sensor 8.

The proposed device operates as follows.

When the disk of the checked counter is turned 9, the CG cascade begins to receive pulses coming from the amplifier Dp. With the arrival of the first pulse, the CG cascade gives a signal

The BC switch that connects the magnetic head 6 to the generator G output provides these signals to the drum 4. At the same time, the signal from the KU cascade locks amplifier Y. When the signal from the KU cascade ends, the BKi switch breaks the connection between the FI generator and the magnetic head 6, and the amplifier Y opens for signals from the head 6.

If the disk of the checked counter rotates more slowly than the disk of the reference counter, then the recorded signal on drum 4 returns to the magnetic head 6 faster than the spot on disk 1) of the rotating counter to the photoelectric sensor 8 window.

In this case, the signal reproduced by the magnetic head 6 is fed to the amplifier U, and from the amplifier to the KUo cascade, which supplies the corresponding signals to the switches of the AC and BC2 switches. The AC switch restores the connection between the amplitude of the 1st pulses up to and the indicator And the beginning starts count impulses (perversity) coming from the sensor To. The switch BK2, by the signal from the cascade KUo, restores the connection between the generator / 2 erase voltage and the magnetic head 7, which erases the previously recorded signal on the drum 4.

After some time, the disk of the checked counter will make a full turn. This is indicated by the arrival of a second pulse from the amplifier Dp to the cascade of the capacitor bank which supplies a signal to the AC switch. In this case, the connection between the sensor Before and the indicator AND is broken, and the latter stops counting the pulses. Simultaneously, the cascade KU is blocked from pulses,. coming in with amplifier dp. This completes the checkout process. The indicator shows the magnitude and sign of error in percentage or time units.

At the next cycle of operation, the button on the cascade CU is pressed.

which is removed from the lock and sends a signal to the indicator I and the cascade / (The Subject will invent and

Claims (2)

1. Device for testing electric meters, containing a reference meter equipped with a photoelectric sensor, the DIFFERENT element of which, illuminated through holes in the disk, is connected to an error indicator through a switch controlled by a photoelectric sensor of the checked counter, characterized in that, in order to improve the accuracy measurement by calculating the error indicator only pulses supplied by the sensor of the reference counter and directly characterizing the magnitude of the error of the test About the counter, a drum is mounted on the axis of the reference counter, on which surfaces magnetic tracks are placed, against which a universal magnetic head is installed, fed at the moments of recording from the generator through a switch closed by a pulse removed from the sensor of the checked counter, and serves as signals , suitable for closing the switch in the indicator circuit. 2. The device according to claim 1, such that, in order to erase the recording, after each measurement of the error of the counter being tested, a head is applied connected to the generator through a switch controlled by signals taken from the sensor of this counter.