SU864191A1 - Device for indicating time delay of switching elements - Google Patents

Description

ORTING OR, two triggers and two indicators, a coaxial input with a resistance connected to the coupler installed between the generator and delay lines, and the output of the delay device is connected to the inputs of the throboscopic oscilloscopes and to the device input simultaneously, and the outputs of the stroboscopic scillographs through pulse shapers are connected to the input of the EXCLUSIVE OR element, the OUT of which through the trigger is connected to the indicator, and the output of one of the pulse shapers is connected via the second trigger to the second mu indicator.

FIG. 1 shows a diagram of an apparatus for indicating the delay time of switching elements in FIG. 2, the pulse shape used for switching.

The device contains a generator of 1 nanosecond pulses, a coupler 2, a coaxial line 3 with resistance, a delay line 4, a stroboscopic oscilloscope 5, an additional stroboscopic oscilloscope b, pulse formers 7 and 8, an element EXCLUSIVE OR 9, two triggers 10 and 11 and two indicators 12 and 13.

The device works in the following way.

On a sample connected to the device's input, pulses of a duration of several nanoseconds, having the form shown in Fig. 2, are received. Such a pulse shape is created by a coupler 2 and a coaxial line 3 with resistance. After the sample arrives at the sample, the reflected signal is fed to two channels of the stroboscopic oscilloscope, and with the aid of different delays, the signals in the pc channels are shifted along the time scale by 0, 9 of the total pulse duration. Using a manual sweep of a stroboscopic oscilloscope, the value of the amplitude of pulses at a specific point in time is applied to the analog outputs. Due to the time shift of the pulses, it is possible to set the sweep so that in one channel the amplitude will be recorded at the end of the pulse, and in the other at the beginning {on the step, Fig. 2).

As a result, at the analog outputs, four xs signal coupling appears: in the absence of switching, p9. Channels A and B receive only DC voltages and LEDs 12 and 13 show signals 0, when switching with a delay, a voltage step appears on the channel recording the amplitude at the end of the pulse) and in this case one indicator shows O, and another one if switching occurs without delay

the steps appear on both channels and the indicators show a signal 1.0. The device can register another 3flHO event: if the first pulse switches with a delay, and after a sequence without delay, then the indicators show the code 1.1. Increasing the measurement speed and improving the accuracy is that the pulse signals are not single, but with the frequency that is given. provides a small difference between the amplitudes of one after another of the following signals, and the recording circuit carries information only about the pulse that the first performs switching. The time it takes to establish the presence or from the Out-. delay is reduced to several minutes, therefore, the measurement process is accelerated by about 10-20 times. When manually adjusting the voltage of the pulse signals, it is possible to ensure that the amplitude of the following signals differs by 2-3% when using this device, where the amplitude of the pulses varies with a speed of 1 V / s at a frequency of 100 Hz, the difference between the amplitudes of the two pulses are hundredths of B, which when switching, where the voltage is ten B, is less than a tenth of a percent. Therefore, the accuracy of determining the delay is increased by approximately the order of.

Claims (2)

1. Shanks R.R. Ovonic threshold switching characteristics, - Journ ,; Non-Cryst Solids, 1970, v 2, p., 504. 2. Show H.P. Holberg S.M. Kosty lev S.A. ReverslbI.e switching lt amorphous chalcogenlde films electronic effects, 1973, v 31, p. 542. Phys. Rev. Lett. 6) tod S b Ji / zj