SU789908A1 - Apparatus for digital displaying of electric pulse shape - Google Patents

Description

The invention relates to electrical measuring technology and can be used in analyzers of deterministic and random pulse signals. The known pulse shape analyzer containing amplitude selectors, with lecturers in duration, anatomizer adders and recorder 1. A disadvantage of this device is the complexity due to the use of analog nodes. The closest to the proposed technical entity is a device for digitally displaying the shape of an electric pulse, including comparators, sources of reference voltages, counters ow. 2. A disadvantage of this device is the reduced reliability due to the use of a large number (by the number of comparators) of pulse counters. The purpose of the invention is to increase reliability. To this end, a device for digitally representing the shape of an electrical pulse containing comparators, the first inputs of which are connected to the input of the device, and the second inputs are with sources of reference voltages, and pulse counters, the counting inputs of which are connected to a source of quantizing pulses, are equipped with two groups of blocks OR and triggers, the outputs of which are connected with the control of the pulse inputs of the pulse counters, the single inputs - with the inputs of the pulse meters installed and the outputs of the blocks OR of the first group, the installation inputs to O - from the output and blocks OR of the second group, the inputs of which are connected to the second outputs of the comparators, the first outputs of which are connected to the inputs of the blocks OR of the first group, and the inputs of the 1st blocks OR of the first and second groups are connected to the outputs (I + JK) -NX of cocharators, where " 3 О, 1, 2 ... and limited to the integer part of the number equal to (n - i) / K, b - the number of comparators, k - the number of OR blocks in each group. The drawing shows the electrical circuit diagram of the proposed device. The device consists of comparators 1, blocks OR 2 of the first group, blocks OR 3 of the second group, pressure switches, triggers 4, counters 5 pulses, source 6 of quantizing pulses and sources 7 reference voltages.

The device works as follows.

The signal under study is fed simultaneously to the inputs V) of the Comparators 1. The ratio of the Pog: Effective response thresholds (the larger to smaller Comparators 1 is determined by the required accuracy of the waveform, and the number of Comparators AND depends on this value and the possible range of amplitude variation of the input signal. The first and second outputs of the comparators are used to remove pulses generated, respectively, at the beginning and end of the moment when the input pulse exceeds the level of the reference voltage. rows of comparators are supplied to one inputs of OR 2 units of the first group, and the pulses from the second output - to inputs of OR blocks 3 of the second group number of blocks or the number of blocks is equal to 2 or 3 to i.ravno..

The minimum value of an integer k is selected from the ratio

 i-4alee (f,

least relative

where a is the level from which the digital display of the signal starts;

the ratio of the successive thresholds of the comparators. Each i-th block OR 2 and OR 3 receives signals respectively from the first and second outputs of the equipment with numbers i + JK, where -j O, 1, 2 ... The value of j is limited to the integer part of the number equal to (and - () / to.

From the outputs of the blocks OR the 2nd group, the signals arrive at the inputs of the installation of 5 counters of pulses, and the 1st counter is prepared to measure the duration of the signal under investigation after the operation of the (1 + k) -th comparator. At the same time, signals from the outputs of the OR 2 blocks of the first group are fed to the single inputs of the triggers 4, which are connected to counters prepared for the measurement, 5 pulses. Occurs on single outputs of the triggers 4 signals allow the passage of quantizing pulses to counters 5 pulses.

After the signals at the outputs of the OR 3 blocks of the second group appear, the corresponding triggers 4 return to the initial state and the arrival of quantizing pulses does not occur. pulse counters 5 controlled by these triggers are terminated. At the end of the signal under investigation, information about its form in a digital form is contained in the counters of 5 pulses. The number of levels k, over which the waveform can be reproduced, and the ratio value (T remain constant for a wide range of amplitudes of the input pulse.

The invention allows to reduce

The number of pulse counters, as a result of which the reliability of the device increases.

Claims (2)

1.Avtorial certificate of the USSR t 546828, cl. GOIR 29/02, 1975. 2. The patent of Germany No. 2.017.513, cl. GOLR 15/06, 1974 (prototype).