Methods for the calibration of vibration and shock pick－ups－Primary vibration calibration by comparison of phase angles

This standard specifies the requirements and methods for vibration calibration using the phase comparison method. This standard applies to linear sensors with a calibration uncertainty of less than ±3°. GB/T 13823.7-1994 Calibration method for vibration and shock sensors Vibration calibration using the phase comparison method GB/T13823.7-1994 Standard download decompression password: www.bzxz.net
This standard specifies the requirements and methods for vibration calibration using the phase comparison method. This standard applies to linear sensors with a calibration uncertainty of less than ±3°.

National Standard of the People's Republic of China
Calibration methods for vibration and shock sensors
Vibration calibration by phase comparison method
Methods tor thc calibrution pf vibration and shock pick-upsPrimary vibration calibration by comparison of phase angles1 Subject content and scope of application
This standard specifies the requirements and methods for vibration calibration by phase comparison method. This standard applies to linear sensors with a calibration uncertainty of less than ±3°. 2 Technical requirements
2.1 Environmental conditions
Room temperature: 20±5℃,
2.2 Instruments and equipment
2.2.1 Standard accelerometer and signal conditioner GB/T13823.7-94
The standard accelerometer and signal conditioner should be calibrated together. The maximum phase shift error within the use rate range is less than 2%. 2, 2.2.2.3 Power amplifier and generator
Total distortion of acceleration waveform: Maximum not more than ±%; Transverse, bending and swing acceleration should be kept to a minimum, with the maximum value at the operating frequency being 1% of the acceleration in the main vibration direction; AC noise should be less than 40dB of this number; 2.2.4 Phase measuring instrument
Frequency range: 20~50001 Phase range: 0～90° Phase angle error: 1°, 2.2.5 Oscilloscope frequency range: 51z～1MHz 3 Preferred frequency 6 frequencies that can be counted and relied on by sensor L should be selected from the following frequencies: 20.40.80.160.315, 630.1250.2306.5600Hz. 4 Follow the standard procedure 4. 1 Control system components
m. Customer standard industry data free download 4.2 According to the technology
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GR/T 13823.7- 94
Gongze type instrument
Standard accelerometer
Micro calibration sensor
Situation signal adjustment
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Phase comparison method Vibration filter system diagram
Rui Xue generator
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Excessive measurement
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Adjust the vibration generator to reach the selected light and vibration level, and measure the phase difference between the two sensors after it stabilizes. 5 Data Processing
The calibration data shall give the relationship between the phase angle and the change. The calibration uncertainty shall be calculated by deducting the corresponding setting level A (Supplementary Material). The confidence level is
.H/13823.7-.94
Appendix A
Uncertainty Calculation
(Supplementary Material)
This standard specifies the confidence level (7=95%; the total uncertainty of the calibration shall be calculated according to Formula A1): X. -+ x+x!
- Random uncertainty
Where: x-
X.\ The system can be determined under the following conditions.
For a given setting multiple of the random uncertainty X, the following formula (A2) is used: Xr:9
Where.e....n
e +e+ri++ri
ntn -1?
The difference between the single measurement base value of the series and the arithmetic mean: Number of core measurements:
[Given the student distribution with the confidence level and the number of measurements, there is (, distribution value", (AI)
For the system error, first eliminate and correct it, and the remaining part is used as the system uncertainty X.4, calculated according to formula (A3): X.5>
Where: K-2.0, the confidence water half is 95%;
Total phase fish error,)||t t||AΦ is calculated according to formula (A4):wwW.bzxz.Net
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where: The phase of the standard accelerometer and the real signal conditioner is (\): The phase angle error of the phase measuring instrument. (): The phase angle error of the signal conditioner of the nuclear sensor is (\). Additional notes:
This standard is proposed and managed by the National Mechanical Vibration and Shock Standardization Technical Committee: This standard is issued by the Fujian Provincial Institute of Metrology Science and Technology. (A3)
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