SU373656A1 - DIGITAL MEASURING DEVICE FOR AN ANGLE ANTENGEN LOSS OF NON-ELECTROLYTIC CAPACITORS - Google Patents

Description

one

The invention relates to the field of electrical measuring equipment.

A digital loss tangent meter for non-electrolytic capacitors is known, which contains a pulse generator, an AC amplifier, a threshold circuit, a test element, a switch and a pulse counter.

A disadvantage of the known device is a considerable measurement time.

Since for any non-electrolytic capacitors, the loss tangent-tg6 does not exceed 0.01745, which corresponds to the angle bG, and the tangents of angles less than one degree are proportional to the angles themselves up to the fifth sign, you can measure counting directly into tg6 values, having a linear scale.

In order to increase speed, a sinusoidal current generator, delay lines, and AND BAN. At the same time, the nerve output of the frequency divider through the delay line and the sinusoidal current generator are connected to the connection point of the AC amplifier input with the measured capacitor, the output of the threshold device is simultaneously connected to one of the inputs of the AND circuit and the inhibiting inputs of the circuit. "And the second prohibiting input of the circuit" BANCH is connected to the first output of the frequency divider, the third input of the circuit "And the signal input of the circuit" BANZ are connected to the second input of the frequency divider, the output of the circuit "And the output of the circuits "BAN connected in parallel to the input time-scale converter.

FIG. 1 shows a functional diagram of the proposed device; in fig. 2 - time diagrams that show his work.

The device consists of a pulse generator 1, a sinusoidal current generator 2, a frequency divider 3, a delay line 4, a key 5, a pulse counter 6, a digital indicator tg6 7, a threshold device 8, a “BAN 9” circuit, a PI 10 circuit, a time-scale converter 11, the amplifier 12 AC.

Pulses with frequency / o (Fig. 2, a) from the generator / pulses are fed to the input of frequency divider 3, which is a conventional pulse counter with division factor K. Square frequency pulses i (period T) from the first output of frequency divider 3 (Fig. 2, b) through the delay line 4 is fed to the input of the generator 2 sinusoidal current (Fig. 2, b), the output voltage of the generator 2 is shown in (Fig. 2, d). The output of the generator 2 is loaded onto the measured capacitor, from which the voltage (Fig. 2, e) is fed to the AC amplifier 12, from the last it goes to the input of the threshold device 8 (Fig. 2, e), producing a positive pulse at the output polarity (Fig. 2, g).

The pulses from the second output of the frequency divider 5 (Fig. 2, h) simultaneously with the pulses coming from the first output of the frequency divider 3 and the pulse generated by the threshold device are fed to the inputs of the BAN 5 circuit. The output of the AND circuit 10 (Fig. - the first pulse) and the output of the “BAN 9” circuit (Fig. 2, to - the second pulse) are connected in parallel to the input of the time-scale converter: //; the pulses allocated by circuits 9 and 10 and extended in time by the time-scale converter // (Fig. 2, l) control the operation of key 5. During one period T, key 5 opens twice and pulse counter 6 comes from the generator / pulses number of pulses, proportional to 26 (Fig. 2, m). The scale conversion of the time-base converter 11 is selected in such a way that the number of pulses corresponds to the numerical value tg6. In this case, the pulse counter 6 captures this number and outputs a signal to the digital indicator tg6 7. The device can operate both in the one-time measurement mode and in the cyclic mode. In the first case, only two pulses are output to the key 5 from the output of the time-of-time converter //.

Subject invention

A digital loss tangent meter for non-electrolytic capacitors containing a pulse generator, one of the outputs of which is connected to a digital indicator of the loss tangent through a serially connected switch and pulse counter, the other output of the pulse generator is connected

To the input of the frequency divider, as well as an AC amplifier, in parallel to the input of which the measured capacitor is connected, the output of the AC amplifier through a series-connected threshold device and

a time-scale converter is connected to the second key input, characterized in that, in order to increase speed, delays, a sinusoidal current generator, an AND and BAN schemes are introduced, the first output of the frequency divider through the delay line and a sinusoidal current generator connected to the point of connection of the input of the AC amplifier with the measured capacitor, the output of the threshold device is connected simultaneously to one of the inputs of the AND circuit and one of the prohibitive inputs of the BAN circuit, the second input of the AND circuit The prohibitory input of the “BANGE” circuit is connected to the first output of the frequency splitter, the third input of the “AND” circuit and the signal input of the “BANGE” circuit are connected to the second input of the frequency divider, the output of the “AND” circuit and the output of the “BANGE CONTROL .