This standard specifies the technical requirements, test methods and inspection rules for digital dynamometers. This standard applies to digital dynamometers. JB/T 5669-1991 Digital dynamometer JB/T5669-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 5669-1991
Digital Dynamometer
Published on September 13, 1991
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Digital Dynamometer
1 Subject Content and Scope of Application
JB/T5669-1991
This standard specifies the technical requirements, test methods and inspection rules for digital dynamometers (hereinafter referred to as dynamometers). This standard applies to digital dynamometers.
2 Reference standards
GB 998
GB2829
GB 2423.4
ZBY002
ZBY003
3 Technical requirements
Low-voltage electrical appliances
Basic test methods
Periodic inspection counting sampling procedures and sampling tables (applicable to inspections of production process stability) Basic environmental test procedures for electrical and electronic products Test Db: Alternating damp heat test method Product labeling
Basic environmental conditions and test methods for transportation and storage of instruments and meters General technical conditions for packaging of instruments and meters
Dynamometers should comply with the requirements of this standard and be manufactured according to drawings and technical documents approved through the prescribed procedures. The dynamometer is divided into eight specifications according to the measuring range: 3.1
0~1, 0~3, 0~5, 0~10, 0~30, 0~50, 0~100, 0~200kN. 3.2 The measurement display mode shall adopt the digital tube three-and-a-half and four-and-a-half digit decimal display, one-digit soil number. 3.3
The indication error of the dynamometer shall not exceed 0.5% of the full scale. When the dynamometer works continuously for 4 hours, the change of the display value shall not exceed 0.2% of the full scale. 3.4
3.5 The test accuracy of the dynamometer shall comply with the requirements of Article 3.3 of this standard at a temperature of 0-40℃ and a relative humidity below 80%. The dynamometer shall be subjected to high (+50℃) and low (-5℃) temperature tests, and the test accuracy after the test shall comply with the requirements of Article 3.3 of this standard. 5 When the power supply voltage of the dynamometer changes within the range of DC 12 ± 1.2V, AC 220 ± 22V, and frequency 50 ± 2Hz, the accuracy shall meet the requirements of Article 3.3 of this standard.
The power consumption of the dynamometer power supply shall not exceed 11W. 3.7www.bzxz.net
The display value of the dynamometer power supply voltage self-calibration accuracy shall not exceed 1000 ± 5 characters. 3.9The insulation resistance between the power supply line of the dynamometer and the casing shall not be less than 50M2. The withstand voltage between the power supply line of the dynamometer and the casing shall not be less than AC 1500V. 3.10
1The paint layer, electroplating layer and sandblasting oxide layer of the casing, panel and parts of the dynamometer shall be uniform in color and shall not have defects such as cracks, blistering, shedding and damage.
3.12The markings on the dynamometer panel shall be clear and firm. The digital display window shall be easy to observe. Switches and knobs on the panel should be firmly fixed and should not be skewed or loose.
All parts of the instrument (purchased parts, cooperative parts) must have a certificate of conformity. 3.13
The internal wiring should be neat and beautiful, the solder joints should be firm, and no false or fake soldering is allowed to occur,
Ensure reliable contact.
Approved by the Ministry of Machinery and Electronics Industry on September 13, 1991 and implemented on July 1, 1992
Test method
4.1 Test conditions
JB/T 56691991
The test environment must meet the requirements of Article 3.5 of this standard. 4.2
Test instruments
Resistive strain type tension and pressure sensor
Standard force measuring machine
No. 5 standard digital voltmeter
AC voltmeter
Low temperature box (room temperature to -10℃);
High temperature box (room temperature to 100℃).
4.3 Indication error test
Connect each instrument as shown below
Standard force measuring machine
Calculate the measurement error 3 according to formula (1):
Accuracy 0.02%:
Accuracy 0.01%;
Accuracy 0.01%;
Accuracy 0.01%:
Sensor
Where: V,—output value of standard digital voltmeter, mV/word: V——measured output value, mV/word.
Working stability test
Dynamometer
Standard digital voltmeter
During the test, the load is added to the sensor, and the dynamometer is powered on and preheated for 0.5h, and the display value of the digital tube is recorded. Then it works continuously for 4h, and the change of the display value of the digital tube is measured.
4.5 Low temperature test
Put the dynamometer in a low temperature box starting from room temperature, and take it out after reaching -5℃ and keeping it for 1h, and test it after recovering for 4h. 4.6 High temperature test
Put the dynamometer in a high temperature box starting from room temperature, and take it out after reaching 55℃ and keeping it for 1h, and test it after recovering for 4h. 4.7 Wet heat test
Perform according to the provisions of test Db: alternating warm and hot test method in GB2423.4, and the test cycle is 2d. 4.8 Transportation and storage test
Transportation and storage environment test shall be carried out in accordance with the provisions of ZBY002. 4.9 Power consumption test
Adjust the power supply voltage to 220V (monitored by a 0.5-level AC voltmeter), and connect a 100mA AC ammeter to the primary circuit of the dynamometer power supply. Turn on the instrument power supply and measure the primary current A. (A), and calculate the power consumption according to formula (2): P=220A.
Self-calibration accuracy test
Turn on the power supply, preheat for 15 minutes, balance the bridge, turn on the self-calibration switch, and measure the display value of the dynamometer. 2
Insulation resistance test
Perform according to GB998.
4.12 Withstand voltage test
JB/T5669-1991
Put the dynamometer on a 50Hz sinusoidal high-voltage test bench, connect the high-voltage lead wires to the instrument power supply line and the casing respectively, and then increase the voltage from 0 to 1000V and keep it for 1 minute without breakdown. 4.13 Anti-vibration test
Fix the dynamometer on the vibration test bench, and the dynamometer shall not be displaced due to vibration. The vibration frequency is 50Hz, the amplitude is 0.5mm, the acceleration is 5g, and the vibration duration is 15min. After the vibration test, check whether the tester works normally. 5
Inspection rules
Each instrument must be inspected and qualified by the factory quality inspection department before it can leave the factory, and it must be accompanied by a product quality certificate. 5.2 The factory inspection items of the instrument include the following: a.
Appearance inspection:
Standard value error test;
Working stability test;
Self-calibration accuracy test.
Type test must be carried out under the following conditions: a.
New products to be trial-produced:
When changes in design, process, and materials affect product performance: When old products are transferred to other factories;
Products are produced again one year after being discontinued:
When batch production is carried out, regular sampling shall be conducted at least once every two years; When quality assessment is conducted for similar products.
Type inspection includes all test items of this standard. 5.4
Type inspection sampling plan shall be implemented in accordance with the provisions of GB2829. Marking, packaging, transportation and other
Instrument labels shall comply with the provisions of JB8, and the labels shall indicate: 6.1
Manufacturer name:
b. Product name and model;
Product number;
Measurement range:
Accuracy level:
Manufacture year and month.
The packaging of the instrument and its accessories shall comply with the provisions of ZBY003. Additional remarks:
This standard was proposed and managed by the Chinese Academy of Agricultural Mechanization Sciences of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Chinese Academy of Agricultural Mechanization Sciences. The main drafters of this standard were Chen Lihua, Meng Fanying, and Hong Liangchen. 3
People's Republic of China:
Mechanical Industry Standard
Digital Force Measurement
JB/T 56691991
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Word Count 6,000
Sheet 1/2
First Edition in December 1991
First Printing in December 1991
Print Quantity 1-500
Price 0.80 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn1661_699 /8
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