SU120605A1 - Device for measuring the duration of electrical pulses - Google Patents

Description

The proposed device for measuring the duration of electrical pulses refers to the known amount of devices in which the time period sought is determined by the voltage up to which the capacitor is charged during this period.

In the device according to the invention, a capacitor is charged from a DC source and switched on by means of a trigger circuit controlled by measured pulses.

The peculiarity of the proposed device is the application of a transformer connected to the source of measured pulses, to the secondary winding of which a polarized relay is activated, triggered by the reverse direction pulse that occurs in this winding and disconnects the circuit at the moment of the end of the measured pulse.

This makes it possible to isolate a single pulse when measuring the duration of pulses of one direction. By switching said polarized relay to a relay with adjustable time delay, it is possible to measure the delay of electrical pulses at the output of the circuit relative to the signals applied to its input.

The drawing shows the basic electrical circuit of the device. The structure of this device includes: a trigger circuit comprising lamps / 7i and L, capacitor C and resistance; a set of measuring capacitors Ci-C, connected via a Yag switch, a lamp voltmeter containing Lz and JJ lamps. milliammeter mA and resistance; transformer Tr-} power; a lamp rectifier L for supplying a direct current circuit to the trigger circuit; an electronic time relay containing a thyratron Ld, a set of capacitors Cs-С „, connected by a switch // 2, and a transformer Tr-2; Differential transformer Tr-3, dl

No. 120605- 2 -

measuring the duration of imulsions; Wi-W2 double-winding and isolated relays and / (| - / /. keys. The switch L1 switches on the lamp voltmeter for various measurement limits, as well as for calibration resistance R, ..

The key / Ci is closed to measure the duration of a single pulse. The switch / (the switch is placed in the position And and the switch K is in the On position; using the IJi switch, one of the capacitors Ci-Ct is connected, which corresponds to the expected pulse duration, the terminals a-b are included in the break of the direct current circuit, through which the test A direct current signal is applied to the terminals, and a voltage is supplied to the terminals in the corresponding polarity from the output of the circuit under test.The voltage pulse is supplied to the primary winding / differentiating transformer Tr-3. duration. On the falling edge of this pulse, a peak of reverse polarity voltage is obtained, which, passing through the winding Wi of a polarized relay connected to the secondary winding of the Tr-3 transformer, triggers this relay. This means that the measuring circuit is turned off at the moment of the end of the measured pulse, thus allowing a single pulse to be separated from the series.

To make the next measurement, it is necessary to discharge the measuring capacitor by pressing the key K2 and turn the key K to the position One. In this case, the resistance R is removed from the voltage supplied through the dd circuit to the winding W of a polarized relay, in contact Wz of which an input DC circuit of the circuit under test is prepared.

To switch to the measurement of the electrical pulse delay at the circuit output relative to the signal applied to its input, the switch key Lz is transferred to position 3, the switch Ks closes and, similarly to the previous one, a DC signal is applied to the input of the circuit under test, and a pulse is removed from its output entry to the trigger circuit input. While watching the deviation of the arrow milliammeter mA. By rotating the knob of the switch Yag, the capacitors Cs-C of increasing capacity are alternately inserted into the circuit of the electronic time relay until the milliammeter arrow is deflected. The sought delay value is found as the difference in the readings of the milliammeter and the time relay.

Subject invention

Claims (2)

1. A device for measuring the duration of electrical pulses, containing a capacitor charged from a constant voltage source and activated by means of a trigger circuit controlled by measured pulses, characterized in that, in order to isolate a single pulse in the measurement of the duration of pulses of one direction, A transformer connected to the source circuit of the measured pulses is applied, to the secondary winding of which a polarized relay is activated, triggered by the action of a pulse generated in this winding. reverse direction and tripping circuit B the moment of the end of the measured pulse. 2. The device according to claim 1, characterized in that, in order to use it, to measure the delay of the pulses at the output of the circuit relative to the signals fed to its input, an adjustable time delay relay is used, connected to a polarized relay.