Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG930-—1998
Pile Dynamic Measuring Instrument
Pile Dynamic Measuring lnstrument1998-05-14 Issued
Implementation from 1998-10-01
Issued by the State Administration of Quality and Technical Supervision
JJG930—1998
Verification Regulation uf PilDynamicMeasuringInstrument
JJG930-1998
This verification regulation was approved by the State Administration of Quality and Technical Supervision on May 14, 1998, and came into effect on October 1, 1998.
Responding unit: National Technical Committee Drafting unit: Chaobei Institute of Metrology, China Institute of Metrology
The drafting unit is responsible for interpreting the technical provisions of the small regulations. Main drafters of this regulation:
Participating drafters:
Yang Ranche
Feng Xiaohua
JJG930—1998
(Hubei Institute of Metrology)
(China Institute of Metrology)
National Ground Support Team Physical Exploration Tips
(Hunan Institute of Geomatics)
(Wuhan Rock and Sea Engineering Technology Development Company) (Hubei Institute of Geomatics)
Technical requirements
Calibration conditions
Calibration methods
Processing of calibration results and calibration cycle
Appendix 1
Appendix 2
Selection of calibration items
Format of calibration certificate (back side)
JJG9-198
JJG: 930—1996
Calibration procedure for pile dynamic measuring instrument
This procedure is applicable to the calibration of pile dynamic measuring instruments that are manufactured, in use and after repair. 1. Overview
Dynamic tester (hereinafter referred to as dynamic tester) is mainly used for basic performance test in engineering. The dynamic tester is composed of sensors, adapters, signal collectors and display controllers. The physical quantities to be measured are acceleration, velocity, dynamic force, strain, etc. The physical quantities can be measured by the dynamic tester. 2. Technical requirements
1 Basic requirements for dynamic test
1. The main technical data of the dynamic tester (including software version) should be provided, and the main technical performance indicators and effectiveness of the system should be provided. Instrument connection method, this instruction manual, 1, 2 The measuring instrument should be complete (including measurement and control cables) according to the measured physical quantity and on-site working conditions, and the system should be controlled. If there are multi-channel dynamic measuring instruments, they should be calibrated according to the actual use conditions: 1.3 The functions of the dynamic measuring instrument 1 are normal:
2 Appearance
2, 1 The dynamic measuring instrument should be marked with the name, model, number, manufacturer name and factory date 2.2 The installation of the sensor should be smooth and flat, and the installation screw holes and bolts should be intact. 2.3 The measuring electrodes and joints should be kept intact and clean: avoid being contaminated by oil and dirt. 3 Working condition of dynamic measuring instrument
3, 1 The working procedure of the measurement should be able to: There should be no freezing, leakage and other phenomena. 3.2 There should be a grounding port on the panel of the dynamic measuring instrument, and the circuits should be well grounded. 3.3 The image of the instrument should be clear and the display should be stable. 4 Technical indicators
4.1 System reference sensitivity of the dynamic measuring instrument
According to the measurement system composed of 4 basic physical units (acceleration, velocity, dynamic force, dynamic strain), at each frequency point of the white parameter number, its expanded minimum uncertainty (:-3) is: velocity
dynamic force
dynamic strain
(dynamic strain sensor refers to tool-type strain sensor) 4.2 Frequency compliance characteristics of the dynamic measuring instrument
J.IG: 930—1998
Within the frequency range of (C-211), the system sensitivity of the vibration meter varies by 1% compared with the reference point
4.3 The amplitude of the vibration meter is 10
4.4 The time indication error of the vibration meter
The time resolution of the vibration meter.0
4.5 The frequency variation indication error of the vibration meter is 1%
The frequency resolution of the vibration meter is 0.01H
4.6 The dynamic range of the vibration meter is 50 (B
4.7 The system noise of the vibration meter is 2m
4.8 4.10 Inter-channel test of dynamic measurement: 1%
4.11 Frequency range error of dynamic measurement instrument: 2%
4.12 Micro-amplitude error of dynamic measurement instrument: 5%
4.13 Sampling length of effective measurement: 1024 points
3. Setting conditions
5. Environmental conditions
5.1 Room temperature: (20±5)
Relative humidity: 80°C
5.2 weeks without strong electric field Interference: no air, body: no vibration, no impact, h Verification equipment
According to the different verification methods and amplitude sizes, the verification equipment is divided into two parts: 6.1 Vibration test see Table 1 (applicable to small value parameter determination) 6.2 Impact method verification see Table 2 (most amplitude verification) IV. Verification method
7 Check the installation of sensors through the external dimensions and working conditions of the dynamic test according to the requirements of Articles 2 and 3 of this Regulation
All types of sensors (acceleration, velocity, dynamic force, dynamic strain) should be rigidly installed on the center of the standard vibration table or vibration table. ：The filter should be installed as far as possible with the back of the standard. 9. The reverse connection of the test cable should be the actual cable used, and connected to the instrument channel when it is actually used. ：The relay at the sensor end should be fixed firmly to avoid unnecessary interference. ：The system sensitivity test of the dynamic measuring instrument should be tested. 3. Dynamic small system state test 0. 4. Dynamic strain system sensitivity test. 93 non 198
T:(:~SAJn\H
2 :(2× 10-7...7..25 x 1(1 21m standard plus #
abandoned special inductance
AC voltmeter
rate meter
dynamic signal
dynamic seat special inspection
can be installed and
:(5x1f 1.-y10-11m
++(1xm-- -2 - 101)m/s
A,+ C% -1%
. 0.59-1%
3 .n.5%-1%
f:+10--2 × 1U-)Hz
d:(2× 10-T~1×10-2)r
;(5× U*4-.1 × 10-Jint/
:(4×10 3.-2×10)m/g
A.: 1.59,--3 pieces
5. ：1.5%--3%
TR: 2%.-10%
Y: 346.--5%
Residual frequency: 1V, differential voltage 0.29
1.001 H2
50.05%
Average frequency: = JJz～20 kHz
Maximum accuracy: 0.24
Sample frequency: 10ilkH:
Periodic frequency: 14
Interval value: 14
(160--1 500) Hx
Jin Ding device
Uncertain
Age item
The frequency of the dynamic intensity meter should be maintained within the range of the dynamic range
The measurement time is the measurement value
The measurement value is still related to the measurement error
JHL:930-1998
Table 1 (missing)
Inspection and construction H equipment service
Technical requirements
7: (---5× 1(r >ITx
: (3×10 7. -2.25>[0-=1m
Standard transportation
Haidouchuan
Method dynamic division
Frequency meter
Assisted total number
Protective liquid
+:(5:10-+- 2x10 1*m:
u:(410J.-2N1u)m/g
: .5% -1%
5..0.55..1*
5::10--22 10')H2
d:(2x10 +.10 2.
+++5x 11.-1×10-1e7s
:(4x10 5--3× Ic* m/*
5:1.5%-3%
5:2.5#-3 pulp
TR: 3% - 10%
7: 3%-5%
decomposition[V, error 0.2
minute:0.001 z
Analog value: 0.1
Application: 51-24H
Sharp point: 0.2%
High sampling point: 1110kIIz
66% standard: 1%
Direct phase: 1 constant
Uncertain!
Font size!
Calibration page
Amplitude error of the time domain and frame domain of the dynamic measuring instrument
Measured channel validity
Micro-integral amplitude error of the dynamic measuring instrument
Only the interference
Control item
Stop nonlinearity of the dynamic measuring instrument
Dynamic range of the dynamic measuring instrument
JJG9301998wwW.bzxz.Net
Table 1 (Continued)
Voltmeter
Generator
Amplification
Measurement system
Calibration station
Signal
Analysis
Technical requirements
Resolution: 1V, error 0.2 yuan
Frequency range: 5Hz-20kH
Accuracy: $0.2%
Resolution: 0.001Hz
Error: milli 0.05%
Instrument information for calibration
Technical parts
: 110--1+)m/g
r: (0.t -10)ms
7, : 3% ~ 5%
(50- 1U 000 ?m/g
Incoming frequency: 2100 kHz
Range: (0-2)kg
Resolution: 0.1g
Performance: one degree; one speed; one weight; one diameter; one true side: one rate; one impulse setting; TR-increase efficiency ratio, 3-relative error 10.1. Acceleration system for dynamic measurement and verification of sensitivity
Uncertainty
Verification device
Uncertainty
( - 3)
Pick up the work as shown in the figure:
Dynamic measurement receiver
Standard Shenzhen
Disassembly package
J3C:9301998
Adapter
Adaptor
Circular small ultra-small controller
Multiple electronic data collection
Signal analysis
Guangzhou HE clothing
Signal transmitter
Figure 1 Verification standard diagram
Use F for special excitation, the frequency point is: 80Hx or 16)H% The recommended standard value is 10 or 100, according to the 8th series of this regulation, such as the frequency sensor of the dynamic platform. Before calibration, the sensitivity of the motion meter is set to the value. During calibration, adjust the system reference sensitivity setting value of the motion meter according to the maximum display of the measuring instrument, so that the displayed amplitude of the measured vibration is consistent with the value displayed on the standard device. This value is the reference sensitivity of the system being tested. For a motion meter without a reference sensitivity setting function, the amplitude can be set on the vibration table as the unit. The system sensitivity measured by the motion meter is: mv/ms2.
10,2 The sensitivity calibration method of the motion meter is the same as that required by Article 10 of this regulation. The unit of the test result is: ms.
10.3 The reference sensitivity of the dynamic force system of the motion measurement is recommended to use a grip value of 100m or 200m/
according to the following relationship:
,
dynamic force, N;
a-acceleration, m/s2
mass, kg:
Use the mass and vibration velocity values of the force sensor to replace the formula (, and you can get the accurate F value, and then you can determine the reference sensitivity value of the dynamic force system of the motion measuring instrument: The required length in the formula () is determined by the additional mass step speed standard. The selection of the mass needle block: the shape should be flexible, and the steel material and the shape of the measuring column should be suitable (the ratio is 1). The size of the mass disk should be adapted to the force of the probe. At the same time, 23 different mass blocks can be selected to calculate t
JJG 930—1998
System reference sensitivity value, during calibration, the force sensor needs to be installed under the standard accelerometer and the additional mass block, and rigidly connected. Attention should be paid to prevent the generation of structural vibration during calibration. The calibration method is the same as the reference sensitivity of the acceleration system, refer to Article 0.1 of this regulation, and the unit of the calibration result is: mV.
The principle of the dynamic strain calibration device is shown in Figure 2.
Standard end C
Vibration table
Standard accelerometer
Installation sensor
The following is a type of strain sensor
Dynamic tester
Amplifier
Adapter
Calibration principle diagram
Case
Current current meter
Frequency meter
Dynamic analyzer
Current sampling device
Display controller
Install the tool-type strain sensor in the middle of the strain calibration device, and the mounting bolts should be tightened as much as possible to ensure that the initial static strain is minimized as much as possible. The recommended vibration test frequency point is: 24UHz or 320Hz. Recommended The standard dynamic displacement amplitude is selected as: (5 ± 1) m (peak-to-peak) - the conversion relationship between the standard dynamic displacement amplitude (peak-to-peak) and the standard dynamic strain is as shown in formula (2): e =
Note x 10%
Formula: L-reference length of strain sensor, mme+
standard dynamic strain, E
dstandard vibration displacement amplitude, mml
Calibration method Back to the acceleration sensor, refer to Article 10.1 of this regulation: During calibration, the connection alarm time should be as short as possible (20:): When reading the value of the strain value being tested , the DC component must be removed: the unit of the calibration result is: mV/e
1 Calibration of the rate response characteristics of the dynamic tester
11.1 Off-point comparison method
The calibration principle is shown in Figure 1
The sensor to be tested is installed on the vibration table. According to the physical state of the sensor to be tested (such as acceleration), the sensitivity value is set on the dynamic tester. Referring to the frequency response range of the sensor to be tested when it leaves the factory, select no less than 7 rate points in the full frequency band. The recommended frequencies are: 10, 20, 40, 80, 160, 320, 650, 1250, 200Hz. The sampling frequency setting of the dynamic measuring instrument should be 15% of the reported dynamic frequency, and the loss value of the data rate point (1 or 11) is the reference value of the reference frequency point. In other words, each time domain loss is measured at a different measurement position. They are expressed in the following formulas: 0%
Where: loss
is the reference value of the first frequency point and the full difference. The calibration shall be in accordance with the provisions of Article A of this procedure. The result of the determination of the mountain danger (3)
If the selected frequency point exceeds the frequency response range of the modified tester, 5 supplements will be made! A frequency point is required to meet the cloud welding 4, 2 tickets are required.
The dynamic variable sensor will not be used to detect the frequency response characteristics of the speed point, 2 selections will be continued Liu De Cen
The installation method is different from the point-by-point comparison method. The short flow is based on the dynamic platform and the female determination report is separated from the frequency excitation camera. As much as possible, the product value setting is suitable for us to select the stimulus norm, record the frequency mountain line, the stack mountain line and the effective reference sensitivity point change 10 new norm value, in order to determine the domain characteristics of the device system under test
1 The dynamic test instrument should be tested at this time with more typical excitation method or previous method according to the present procedure. Article +.2. When the test is concluded, [2 Activision pre-test|| tt||12.1 Recording method verification
Special sliding vibration table to estimate the dynamic range (dynamic rate is the whole book rate point), more than not less than 6 different standard fraud values according to the vertical amplitude ", 2, 5 [we \ choose the whole effect) or according to 1, 2, 4, 6, 8, the average loss value, while the dynamic measurement according to each measured value according to (4) the dynamic measurement instrument sings the non-load more machine error:
Fay ei × 100%
(- 1.2--.*)
Amplitude nonlinear test error (normal)
rv--a, maximum amplitude
take the maximum amplitude of the product as the maximum amplitude of the velvet quality:ru
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