The Reasonability Check of Electrical Connector Testing Instruments and Equipment

The check process of the reasonability of electrical connector testing instruments and equipment is as follows:

1. Inspect the equipment allocation rate

The equipment allocation rate is the ratio of the actual number of parameters that can be tested to the number of parameters that should be tested specified in the product technical standards. For the quality consistency inspection of electrical connectors and their components, the equipment allocation rate should reach 100%.

2. Inspect the measuring range and resolution ratio of instruments and equipment

The measuring range and resolution ratio of the instrument and equipment shall be compatible with the test parameters specified in the items of product quality consistency inspection.

Suggestion: 1 / 5S ≤ a ≤ 2 / 3S I ≤ 1 / 5T - 1 / 10T

General Training Module:

S -- the measuring range of the instrument

A -- the checked value

I -- the resolution ratio

T -- the permissible error of tested parameters.

(1) 1/5S≤A≤2/3S

The value of the tested object is usually required to be within 20%-80% of the measuring range of pointer instruments and equipment such as spring scales, ergometers, torque meters, tension testers, ampere meters, voltmeters, insulation resistance detectors, etc. The detection accuracy and service life will be affected if the tested value is beyond the upper and lower limits of this range, .

The above factors have been considered in the design of electronic intelligent instruments. There is a certain safety margin between the upper limit of the range displayed by the instrument LCD and the upper limit of the range that the instrument can withstand, so users can use it at ease. For example, the upper limit of AC voltage set in the withstand voltage test of the 30X series multi-functional instrument produced by NAC company is 750V, and the AC voltage that the actual instrument can withstand is 1060V.

(2) I≤ 1/5T～ 1/10T

According to the test methods for electrical connectors in GJB1217, it is not allowed to exceed 1μs during vibration, impact, collision and cable pull-out force tests. According to the above provisions, the monitor with the detection sensitivity (resolution ratio) of 0.1μs should be selected. For example, the monitoring transient interruption time (0.1-99.9 μ s) and the detection sensitivity (resolution) of 0.1μs can be set on the NM-11A of NAC company according to the technical standards of the detected interconnection devices.

3. Check the accuracy of instruments and equipment

The accuracy of the instrument and equipment should be compatible with the permissible error range of the tested parameters. According to the different nature and characteristics of test tasks, enterprise test laboratories can be divided into inspection, monitoring and measurement. The measurement properties of the inspection and monitoring of electrical connectors and their components (wiring harness) can judge the product parameters or control the technological parameters within the permissible error range. The measuring error of the equipped instruments and equipment is required to be far less than the permissible error range of the tested (controlled) parameters, i.e. U < T. However, the measurement of unshaped design experimental articles is different from that of the first two categories. There is no specified range for the measured parameters, and only the accuracy (△ tolerance) is required for the measured parameters.

For the measured objects without technical standards or process documents, the actual measured values are usually provided to the commissioned surveyor only through the measurement. In this case, the requirements can be met as long as the limit error of measurement U is less than or equal to △ tolerance.

For example, the insulation resistance test, withstand voltage test and contact resistance test according to the connector product standard belong to the inspection category, while the control of process parameters such as the temperature and pressure during the insulator injection molding belong to the monitoring category. In the same way, the transient interruption time of dynamic environmental tests such as vibration and impact can be monitored by transient interruption monitors. The test of finalized products with product standard and permissible  transient interruption time belongs to the inspection category, while the test of products that are not finalized and without product standard belongs to the measurement category when they are in design and process investigation tests.