Instrument calibration method for vibration and shock sensors - Database & Sql Blog Articles

Instrument calibration method for vibration and shock sensors

1

, instrument calibration content and scope of application

This standard specifies the instrumentation and test methods used for the magnetic sensitivity test of vibration and shock sensors.

This standard applies to vibration and shock sensors.

2

Instrument calibration standard

GB/T 2298

Mechanical vibration and shock

GB/T 13823.1

Vibration and shock sensor calibration method

3.

Instrument calibration term

The terms used in this standard are derived from

GB/T 2298

. Magnetic sensitivity definition

GB/T 13823.1

First

4.3.6

Article.

4

Instruments and devices

4.1

Magnetic sensitivity test device

Sensor magnetic sensitivity test device

1

Shown: bracket coil sensor sensor output test platform air cushion isolator

a

. Two coils of equal number of turns and the same size and shape are symmetrically and coaxially mounted above the test platform and are free to rotate about the axis of rotation on a horizontal plane.

b

. The sensor is mounted horizontally on the test platform and centered at the midpoint of the centerline of the two coils

(

That is, at the center of the two coils

)

.

c

. The excitation power source generates an alternating current while flowing through the two coils to generate a magnetic induction rms value at the sensor installation.

0.01T

Frequency is

50Hz

The alternating magnetic field. Magnetic field unevenness must not exceed the space in which the sensor is installed

±10

%.

d

. The quality of the test platform is greater than the quality of the sensor under test.

50

Double, and at the same time, take vibration isolation measures to make the signal-to-noise ratio greater than the test

10dB

.

e

. At the sensor installation, there should be no magnetically conductive material near the test platform and the coil.

4

.

2

Low noise amplifier

Gain error is less than

±2

%.

4

.

3

AC voltmeter

The error is less than the reading

±1

%

4.4

AC Tesla

The error is less than the reading

±5

%

4.5

Working temperature

The working environment temperature of each of the above instruments is

20±5

degree

5.

Test Methods

5.1

Connection of each instrument device

5.2

Determination of magnetic induction

The same current is applied to the two coils and the size is changed, and measured by a Tesla meter, the effective value of the magnetic induction of the magnetic field at the midpoint of the center line of the two coils is adjusted to

0.01T

.

5

.

3

Test procedure

The sensor to be tested is horizontally mounted on the test platform with a non-magnetic screw and placed at the midpoint of the center line of the two coils.

a.

Rotate the coil slowly while carefully observing the voltmeter and note the output value of the sensor and its corresponding angle;

b.

The sensor is rotated a small angle around its vibration sensitive axis and re-tightened;

c.

repeatedly

a

~

b

The steps until the sensor's output value in the magnetic field is found.

Pay attention to removing interference signals when testing.

6.

Final calculation method

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