SU1310664A1 - Device for calibrating vibration instrumentation - Google Patents

Abstract

The invention relates to vibration measuring equipment and can be used to calibrate vibration measuring equipment with a piezo sensor, mounted on a vibrating object, both during the tuning process and during operation. The aim of the invention is to increase the accuracy of the calibration by using as a test signal a voltage that repeats in frequency and shape, but stable in amplitude, the voltage due to the vibration of the object. The device works as follows. Not dismantling the piezo sensor 1 from object 4 closes the contacts of the toggle switch 8. The voltage at the output of block 9 depends on the value of UQ. By changing it, the readings of the output unit 7 are equal to zero. Then, the contacts of the toggle switch 8 are diluted and, by changing the transfer coefficients of the blocks 5 and 6, the nominal reading on the output unit 7 is set. 1 Il. & (L with Oi O 4;

Description

113

The invention relates to a vibration measuring technique and can be used to calibrate vibration measuring equipment with a piezo sensor installed on a test object.

The aim of the invention is to increase the calibration accuracy by using as a test signal a voltage repeating in frequency and in shape, but stable in amplitude, the voltage due to the vibration of the object.

The drawing shows a block diagram of the device.

The device for calibrating vibration measuring equipment contains a piezo sensor 1, which has an additional piezo plate 2 and a working piezo stator 3 and is mounted on the vibrating object 4, the input unit 5 connected in series, the amplifier 6 and the output unit 7, the toggle switch 8, connected to the additional unit with one contact - a piezoprotective piezoplate sensor; To the working piezoplate 3, the input of the input unit 5 and the variable voltage stabilization unit 9, consisting of an adjustable amplifier, are connected.

Then the contacts of the toggle switch 8 are opened and taking into account the known values of the voltage reference voltage Ugn and

10, the input of which is connected to the output of the input block, and the output is connected to 30 transmitting coefficients of the piezo sensor

with detector input 11 and another toggle switch contact 8, detector output 11

1 and detector 11, by changing the transmission coefficients K, K, set the reading of the output block 7 equal to nominal

connected to the first input of the differential amplifier 12, to the second input. which is supplied with a constant reference voltage, and the output of the differential amplifier 12 is connected to the control input of the adjustable amplifier 10.

The device works as follows.,

The piezoelectric sensor 1 is not dismantled from the vibrating object 4, toggle the contacts of the toggle switch 8. In this case, the readings of the output block 7 are determined by the expression 1 and detector 11 by changing the transmission coefficients K, K to set the reading of the output block 7 equal to the nominal

35

m; Oh,

and - KI,

 bn

40

where N is the nominal value of the indications of the output unit 1

 nominal values of Kg and K ratios.

Claims (1)

Invention Formula by N (Ug - and., where N is the output unit 1 Ua and. A device for calibrating vibration measuring equipment, containing a series-connected input unit, an amplifier and a decoder unit, a toggle switch and a piezo sensor with a working piezo plate connected to the input unit input, characterized in that, in order to improve calibration accuracy, it is equipped with a variable voltage stabilization unit voltage, brought to the input by the input consisting of an adjustable amplifier, the voltage block 5, the load of which is connected to the output of the input-word supply by the additional unit, the detector, the input pionoplate 2, connected to the output of an adjustable voltage from the output of the block 9, and the first contact of the toggle switch, voltage 5 brought to the input of the input block 5 due to vibration of the object i stabilization of alternating voltage, antiphase voltage Ug, Kg, K - transfer coefficients of the input unit 5 and amplifier 6, respectively. The voltage amplitude at the output of block 9 depends on the constant reference voltage U and does not depend on the voltage at the output of the input device 5. Then and, TO. Wy. Ksch where K. transmission piezo transmissions  - coefficient sensor 1, K - coefficient Torah 11. Change the constant reference voltage Uj, n of the output block 7 is reduced to zero N (Ue - K,  to;;   about Then the contacts of the toggle switch 8 are opened and taking into account the known values of the constant reference voltage Ugn and transmission coefficient 1 and detector 11, by changing the transmission coefficients K, K, set the reading of the output block 7 equal to nominal 35 m; Oh, and - KI,  bn where N is the nominal value of the indications of the output unit 1  nominal values of Kg and K ratios. Invention Formula 313106644 the differential amplifier, the first amplifier is connected to the control input, the input of which is connected to the output of the de-adjustable amplifier, and the piezo sensor, and the second input is designed to be filled with an additional piezo for supplying a constant base plate differential output with a large toggle switch contact.