SU614393A1 - Digital voltmeter - Google Patents

Description

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This invention relates to a measurement technique.

A digital voltmeter is known that contains matching blocks, triggers, assemblies, stable frequency generator, counter, amplitude-time converters connected to the first matching blocks, to the other inputs of which are connected to the stable frequency generator outputs, and the outputs are connected to the inputs of the first assembly 1Д.

However, this digital voltmeter has insufficient measurement and is very powerful in operation,

The purpose of the invention is to improve measurement accuracy and reliability.

This is achieved by offering; A compatible digital voltmeter, matching blocks, triggers, assemblies, stable frequency generator, counter, amplitude-time transducers connected to the first matching blocks, to the other inputs of which are connected to the stable frequency generator outputs and equipped with a frequency divider and a block for allocating the number of healthy amplitude-time converters. Outputs of amplitude-time converters via triggers are connected

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to the inputs of the allocation unit of the number of serviceable amplitude-time converters, the outputs of which are connected to the inputs of the second matching units. The other inputs of these coincidence blocks are connected to the outputs of a frequency divider whose input is connected to the output of the first assembly, and the outputs of the second coincidence blocks are connected to the input of the counter via the second assembly.

The drawing shows the functional diagram of this digital voltmeter. It contains amplitude-time converters gj j connected to the first blocks of the match 2-1г-2- П J to the other inputs of which are connected the outputs of the generator 3 of stable frequency, and the outputs are connected to the inputs of the first assembly 4,

In addition, this voltmeter contains a frequency divider 5 and a block 6 for allocating the number of serviceable amplitude-time converters. The outputs of the amplitude-time converters 1-lfl- П through the triggers 7-1т7-Н are connected to the inputs of the block 6, the number of serviceable amplitude-time converters and to the blocks of coincidence 2-1Т-2- ". The outputs of the block 6 are connected to the inputs of the second blocks match 8-1-g8-y. The other inputs of the el-rS-C match blocks are connected to the output frequency divide 5, the input of which is connected to the output of assembly 4, and the outputs of the match blocks 8-1-8- are connected to the input of counter 9 via the second build 10. The operation of this voltmeter is next. In the original state, the voltmeter is set by a reset pulse (the flip-flops P and the counter 9 set them to the zero state). In the process of measuring the amplitude -. temporal transducers l-lfl- W form time intervals in the form of electrical pulses, the duration of which is determined by the conversion factors and the error aad of the transducers by random processes, etc. Triggers 7-1g7- "front edges of pulses from the output of ampc" transiently time converters 1-l-fl-W are set to one state. Signals from the outputs of trigger 7 1 --- 7-- P set blocks of matches 2-1t2-P to the state at which the AND-phase signals from the generator of 3 stable frequency during the action of the pulses from the outputs of hych tritudo-time converters 1-1-g1-tf proch "t through them to the assembly 4, and from its output - to the divider 5 frequencies, the outputs of which form signals with frequencies 4d, / 2, / Y5 .., f g./rt. When the number of serviceable amplitude-time converters arrives at block 6 for “single signals from outputs, flip-flops 7-1-g7-” block 6 generates an output and a single signal that is sent to the coincidence block 8-K, the latter sends a signal with a frequency of 10, from the output of which a signal to the post gives to the counter 9. Counter 9 counts N pulses: q, K tU —JCT- U d. — i, .1e ... Kc is the coefficient where K |, Kj you convert amplitude-time converters 1-1-1-k, tr- and

Claims (1)

4 is the alternating voltage, i is the frequency of the signal of the generator 3 of a stable frequency. The measurement result is the arithmetic average of the converted values of P amplitude-time converters 1-1-1-c. With two good amplitude-time converters, counter 9 counts the pulses, the number of which is Ho: M «KitJ f With an OD of a good time-amplitude converter, the 9 ps counter reads the pulses, which are equal to: N. This digital voltmeter remains operable, if the faulty amplitude-time converter at its output has both a low voltage level corresponding to a logical zero and a high level corresponding to a logical one. DETAILED DESCRIPTION OF THE INVENTION A digital voltmeter containing match blocks, assembly triggers, a stable frequency generator, a counter, amplitude-time converters connected to the first blocks of the match, to the other inputs of which the outputs of the stable frequency generator are connected and the outputs connected to the inputs of the first assembly, about so that, in order to improve measurement accuracy and reliability of operation, it is equipped with a frequency divider and a block for allocating the number of serviceable amplitude-time converters, with the amplitude outputs The o-time transducers are connected via triggers to the inputs of the block, the number of healthy amplitude-time transducers, whose inputs are connected to the inputs of the second matching blocks, the other inputs of these matching blocks, are connected to the outputs of the frequency divider, the input of which is connected to the output of the first assembly, and the second outputs blocks of coincidence are connected to the input of the counter via the second assembly. Sources of information taken into account in the examination: 1. USSR Author's Certificate No. 416620, cl. q 011 19/04, 10.01.72.