SU1661677A1 - Capacitor capacitance meter - Google Patents

Abstract

This invention relates to instrumentation and is intended to automatically measure the capacitor capacitance in a wide frequency range. The purpose of the invention is to improve the measurement accuracy at a given frequency - achieved by introducing into the device an input unit 1 consisting of exemplary capacitors 2, 3 and terminal 4.2 for connecting the measured capacitance, stabilization mode unit 8, keys 12-14, frequency keyboard unit 15, a register memory unit 16, a digital comparator 17 slots and a decoder 18, and the frequency-capacitive converter 5 is made in the form of an inductance unit 6 and a capacitor unit 7. The device also contains a terminal 4.1 for connecting the measured capacitance, a frequency-capacitance converter 5, a frequency-digital converter 9, a calculation and control unit 10, and an indicator 11. 1 sludge.

Description

This invention relates to a test instrument and is intended to automatically measure the capacitance of a capacitor in a wide frequency range.

The aim of the invention is to improve the measurement accuracy at a given frequency.

The drawing shows the block diagram of the device.

| The device contains an input block il, consisting of exemplary capacitors 2 and 3 () and terminals 4.1–4.2 for connecting the contacts 4 of the measured capacitors (C), the block 7 of capacitors, the block 6 of inductances, the frequency-capacitive converter 5, containing the stabilization unit 8 frequency-digital converter 9, calculation and control unit 10, indicator 11t, three keys 12, 13 and 14, frequency keyboard block 15, register memory block 16, digital code comparator 17, decoder 18.

The device works as follows.

After dialing the frequency at which it is necessary to measure the capacitance of the capacitor Cx under study, the command from block 15 of the frequency keyboard goes through block 16 of the register memory to the digital comparator 17 of the frequency codes. By the same command, the measured capacitor Cd is connected to the frequency-capacitive converter 5, its frequency value is measured by the frequency-digital converter 9, the measured frequency is supplied to the digital comparator 17, In case of a mismatch between the codes of the set and the measured frequency, the calculator 10 The control produces a control signal which, via decoder 18, acts on the block 6 of inductance, by means of which the required frequency subband is established. After aligning the first frequency bits by the digital frequency code comparator 17, a block of 7 capacitors is turned on, which allows the subsequent codes of the set and measured frequency to be balanced with the required accuracy. be

block 10 calculation and control. The next moment the command to disconnect the measured capacitor is given.

With " via controlled contacts 4 of unit 1 of a controlled key 12. In the second cycle, to the frequency-capacitive converter 5 is connected with a controlled key of 13 C ()

The frequency f is measured and stored. In the third cycle, a disconnection command C is received and connected with a control key 14 C, the frequency f is measured and stored.

5 Further according to the formula

s, - “, / Ј.) .. s,

0

i (f, / f4) 2 - fj.

f- (f, / f2):

Crx is calculated, and then C. The result of Cx is highlighted on the display of indicator 11. The mode stabilization unit 8 allows stabilizing the parameters of the frequency-capacitive converter 5 (Rx and Sx) in the measured range as the frequency changes and read them by the data.

Claims (1)

0 claims A device for measuring the capacitance of a capacitor, containing a series-connected frequency-capacitor converter, a frequency-digital converter, a calculation and control unit, and an indicator, the first input of the frequency-capacitive converter connected to the first 0 terminal for connecting the measuring capacitance, characterized in that, in order to improve the measurement accuracy at a given frequency, serially connected 5 frequency selection unit, register memory unit and digital code comparator, decoder, three keys, stabilization unit, two model capacitors, first pins Which Q are connected to the first terminal for connecting the measured capacitance, and their second outputs respectively via the first and second switches are connected to the second input of the frequency-capacitor converter and connected via the third switch to the second terminal for connecting the measured capacitance to the switches the control output of the unit is calculated516616776 Both the control and the input are decrypted with the digital comparator input, the output of which is connected to the control codes, and the output of the stabilization unit by the variable frequency capacitance press input terminal is connected to the corresponding BXQ converter, and the frequency capacitance output convertible-to-digital converter connector.