List of relevant testing items of 100 inspectionsThird-party testing institutions support sample sending and door-to-door testing, mainly providing sample testing services for companies, enterprises, public institutions, individual businesses, and university scientific research, and reporting CMA/CNAS/CAL qualifications, which are true and effective.
Sample size: according to the size of the sample to choose the sample or door-to-door
display style: electronic
version of the detection cycle: 3-15 working days (expedited).
Standard number: NF C93-010-2015 Chinese standard name: NF C93-010-2015 Preferred number series for resistors and capacitors English standard name: Preferred number series for resistors and capacitors Release date: 2015-08-22 Implementation date: 2015-08-22 Chinese standard classification number: L10 International standard classification number: 31.040.01; 31.060.01
Testing method for resistors: 1. When using a pointer type multimeter for testing, first turn the gear knob on the pointer type multimeter (hereinafter referred to as the multimeter) to the appropriate "Q" position based on the resistance value of the resistor. After selecting the measurement gear, it is also necessary to stop and zero the resistance of the multimeter. Short the two probes of the multimeter to each other, and turn the "zero" knob to point the needle to the "0" position (full scale) of the resistance scale. It is important to note that every time a gear is changed during measurement, the gear should be reset to zero. Connect the two probes of the multimeter (regardless of positive or negative) to the leads at both ends of the resistor to be tested, with the needles pointing to the corresponding resistance scale. If the watch needle does not move, the indication is small and stable, or the indicated value differs significantly from the value indicated on the resistor, it indicates that the resistor is damaged. When measuring resistors with resistance values of several tens of kiloohms or more, be careful not to touch the leads at both ends of the resistor with your hands at the same time to avoid measurement errors caused by connecting the human body resistance. 2. Before using a digital multimeter to measure a resistor, there is no need to zero it. Turn the gear knob to the appropriate "O" position, and turn on the power switch to measure. When selecting the measurement gear, it is advisable to display as many significant digits as possible on the display screen. For ordinary measurements, resistors below 200 Ω can be selected in the "200 Ω" gear, resistors between 200 and 1999 Ω can be selected in the "2k Ω" gear, and resistors between 2 and 19 99k Ω, resistor can be selected in "20kQ" gear, 20-199 9k Ω resistor can be selected in "200k Ω" gear, 200-1999k Ω resistor can be selected in "2M Ω" gear, 2-19 The 99MQ resistor can be selected in the "20M Ω" range, ranging from 20 to 199 The 9M Ω resistor can be selected in the "200M Ω" gear. Resistors above 200M Ω cannot be measured due to exceeding the maximum range (using DT890B digital multimeter as an example). When measuring, two probes (regardless of positive or negative) are connected to both ends of the measured resistor, and the LCD display screen displays the resistance value of the measured resistor R. If "000" (short circuit) is displayed, only "1" (open circuit) is displayed in the highest position, or if the displayed value differs significantly from the value indicated on the resistor, it indicates that the resistor is damaged. The content introduced above is the detection method for resistors. Of course, there are many ways to detect the quality of resistors, so you can also choose the appropriate detection method based on actual needs
The content of the above article is a partial list. For more testing needs and details, please consult the free online consultant of the institution: 152 0173 3840 (phone and WeChat), conducting testing on over a hundred inspection websites - issuing authoritative testing reports has legal effect
Function of testing report:
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1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
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6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in Chinarole of the test report:
1. Project bidding: issue an authoritative third-party CMA/CNAS qualification report;
2. Online e-commerce platform entry: quality inspection report recognized by major e-commerce platforms;
3. Used as a sales report: issue a test report with legal effect to make consumers more assured;
4. Papers and scientific research: provide professional personalized testing needs;
5. Judicial services: provide scientific, fair and accurate testing data;
6. Diagnosis of industrial problems: verification and correction of problems in industrial production;