SU1532881A1 - Arrangement for tolerance inspection of contact resistance of potentiometer contacts in gyroscopic instruments - Google Patents

Abstract

The invention relates to instrumentation engineering and can be used to monitor the contact resistance of a potentiometer. The purpose of the invention is to expand the scope of application by ensuring tolerance control of the contact resistance of potentiometers. The device comprises a low-frequency filter 1, a block 2 for selecting an absolute signal magnitude, a block 3 for sampling-storage and shift, a comparator 4, an indicator 5, a generator 6 for control. New is the presence in the composition of the device filter 1 low frequency, block 2 of the absolute magnitude of the signal and the indicator 5. Expansion of the scope of application is achieved by ensuring tolerance control of contact resistance of potentiometers. 3 il.

Description

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The invention relates to instrumentation technology and can be used to control transient contact resistance of potentials.

The purpose of the invention is to expand the scope by providing tolerance control of contact resistance of potentiometers.

Fig. 1 is a schematic diagram of the connection of the potentiometer under test; 2 is a plot of the voltage supplied from potentiometer p | FIG. 3 is a block diagram of a device for the tolerance control of a contact resistance of a potentiometer in gyroscopic instruments.

The tested potentiometer R of the connectors to the source of the two-pole voltage U of the direct current (Fig.) Is not a component of the tolerance control device.

With any changes in contact resistance, the voltage (Fig. 2) coming from the slider changes in proportion to the amplitude and duration of the values of change in contact resistance and is superimposed on its smooth change taken from terminals A and B. Registration and evaluation is carried out by processing this information.

The device for tolerance control contains a low-frequency filter I, 1 block 2 of the absolute value of the signal, block 3 of storage and shift, comparator 4, indicator 5, control generator 6 and the low frequency filter output 1 through block of the absolute value of the signal sig

the isolation is connected to the first input of the storage and shift sampling unit 3 and the second input of the comparator 4, the output of the sampling storage and shift unit 3 is connected to the first input of the comparator 4, the output of which, in turn, is connected to the input of the indicator 5, the first output control generator 6 is connected to the second input of the sample-storage and shift unit 3, and the second output to the third input of the comparator.

The device works as follows.

Smoothly varying voltage from the gyropribor potentiometer during its verification at the stand enters the input of a low-frequency filter 1 with a band

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a pass of 0-250 Hz at a level of 3 dB, and from its output to the block 2, the selection of the absolute value of the signal, the output of which always has only a positive value.

The first command pulse from the output of the First Control Generator 6 opens for storage the sample-storage and shift unit 3 for a short time (25-KG6s), where its voltage is stored until a new comparison cycle of 4-1 (G3s. In the applied in block 3 sample storage and shift of an operational amplifier with a large input impedance, the output level is shifted to the negative side by a trimming resistor by a selected selection threshold of 100 mV and fed to the reference input of the comparator 4, to the other input of which all time goes Current voltage. At the end of the cycle, control generator 6 receives a second command pulse at comparator 4 and, at the output of comparator 4, if the current voltage value changes less than the reference signal Scrap, which is fixed in the RS flip-flop of indicator 5, which excludes self-return. the cycle repeats. 0

The device allows to provide tolerance control of changes in contact resistance of potentiometers over a wide range (10.0-10 s) with intervals between the moments of Changes of about 10 ..

Claims (1)

Invention Formula A device for tolerance control of transient contact resistance of potentiometers in gyroscopic instruments, comprising a control generator, a sampling-storage and shearing unit, a comparator, the first output of the control generator is connected to the second input of the storage and shearing sampling unit, and the second output - to the third; the input of the comparator, the first input of which is connected to the output of the sample-storage and shift unit, the first input of which is connected to the second input of the comparator, characterized in that, in order to expand the field of application by providing tolerance control of the contact resistance of the potentiometers, a low filter is introduced into it frequency, the absolute value selection unit of the signal and the indicator, while the output of the low-frequency filter through the absolute selection unit is ± 10 b P / HR one  Li 61J # Jl rV / -Y Editor O.Spesyvyh Order 8095/51 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 The signal is connected to the first input of the storage and shift sampling block, and the comparator output is connected to the indicator input. one Compiled by I.Kozlov Tehred L. Oliynyk Proofreader E. Lonchakova Circulation 714 Subscription