SU785799A1 - Pulse duration measuring device - Google Patents

Description

The invention relates to measuring equipment.

A device containing a comparator and shaper til ·

Known devices do not provide 5 measurements of the pulse duration at a given level in the absence of a priori data on the amplitude of a single go pulse repeating. 10

A device is also known containing a limiter, a differentiating circuit, an amplifier, a Schmitt trigger, and voltage dividers. The limit threshold for measuring the duration at a given level 15 is set by the operator with a known pulse amplitude in a periodic pulse sequence [2].

This device does not allow measuring * 20 the duration at a given level of single or radio repetitive pulses with unknown amplitudes.

The aim of the invention is to enhance the functionality.

This goal is achieved by the fact that in the device for measuring the pulse duration, containing a voltage divider and connected in series 30 with a limiter, a differentiating circuit and a Schmitt trigger, a delay line, a peak detector, a switched storage unit, a pulse inhibitor, a key, the first input of which is connected to the device’s input, and the output is connected to the inputs of the peak detector, the inhibitor of the inhibit pulses and through the delay line to the input of the limiter, the second input of which is through a switched apominayuschy unit and a voltage divider connected to the output of the peak detector, a second input switch connected to the output of the pulse prohibition, the second input of which is connected to the output of Schmitt trigger "ta, the output of the differentiating circuit connected in parallel to the second input dial storage unit.

The drawing shows the proposed device, a structural diagram.

The device contains a key 1, a delay line 2, a peak detector 3, a shunt pulse generator 4, a voltage divider 5, a limiter 6, a switched storage unit 7, a differentiating circuit 3, a Schmitt trigger 9.

The device operates as follows.

The input signal through the public key 1 is supplied simultaneously to the delay line 2, the peak detector 3 and the driver 4 of the inhibit pulses. The amplitude of the pulse, divided by a divider 5 a predetermined number of times, creates a limit threshold for limiter 6. So that the limit threshold is maintained during the passage of the rise and fall, i.e. of the entire pulse through the limiter, the voltage separated by the divider 5 is stored by the switched memory unit 7. In order to prepare the device for operation for measuring the next pulse, the level voltage is removed from the switched memory device by the pulse from the output of the differentiating circuit 8 formed by the decay of the measured pulse.

The creation of a time interval equal to the pulse duration at a given level is ensured by setting the threshold voltage for the limiter 6 until the moment of arrival of the pulse. For this, the delay time of the pulse in line 2 must be at least its duration. The influence of the Next pulse on the restriction level is prevented by applying a prohibition pulse to the key 1, which is generated by the device 4.

The duration of the inhibit pulse is equal to the delay time. This pulse closes the electric key from the moment the studied pulse passes through it until the drop in the output pulse of the Schmitt trigger 9 occurs.

To measure the durations in a wide range of their values without reducing the speed of the device, the duration of the delay varies discretely. This ensures the formation of a time interval at the output of the device for all pulses whose duration exceeds the duration of the delay in the line.

Thus, the device provides the formation of a pulse with a duration equal to the duration of the 5 measured pulse at a given relative level, even if the new pulse will significantly differ in amplitude from the previous one.

Claims (1)

Claim A device for measuring pulse duration, comprising a voltage divider and series-connected limiter, a differentiating circuit and a Schmitt trigger, characterized in that, in order to expand the functionality, a delay line 20, a peak detector, a switched storage unit, a prohibition pulse generator are introduced into it, the key, the first input of which is connected to the input of the device, and the output is connected to the inputs of the peak detector, the pulse shaper of the prohibition and through the delay line to the input of the limiter, the second input of which is connected to the peak output via a switched storage unit and a voltage divider 30 of the detector., The second key input is connected to the output of the inhibit pulse generator, the second input of which is connected to the output of the Schmitt trigger, and the output of the differentiating circuit is connected to the second input of the switched storage unit.