Test method for contact resistance of connectors

Test method for contact resistance of connectors

Note: EIARS-364 was issued earlier on this TP-23

1.0TP Low contact resistance 23

2.0 Purpose

This method introduces the contact resistance of the standard method without damage or melting of the insulation layer.

3.0 Sample Preparation

3.1 The test sample consists of a pair of matching terminals, such as tin pins and solder bases, matching terminals with opposite polarity or printed circuit boards and their matching terminals.

3.2 Connect the wires specified in the specifications as shown in Figure 2A, and the terminal coordination is shown in Figure 2, as shown in Figure B

3. The test sample should be assembled into a connector that can function normally, and samples that cannot be installed as connectors should not be forcibly installed in any other way. If forcibly installed, it will affect the strength of the contact surface inside the matching terminal.

4.0 Testing Methods

4.1 Testing instruments

The testing instruments include:

4.1.1 A 10% millivolt meter with a full deviation range accurate to ± or an accurate reading accurate to 2% ± the appropriate range.

4.1. Two low-level circuits have the ability to transmit and accurately measure the maximum current of 1000mA and the maximum open circuit potential of 20mV. The feasible circuit shown in Figure 1 (with an output test current of 1mA), measured for AC, with a frequency not exceeding 2KHz

4.1. DC or AC power can be used for measurement, but in any case, DC testing should be controlled.

4.2 Test steps

4.2.1 Connect test samples T1 and T2.

4.2.2 Apply voltage in the positive direction of the test circuit and record the voltage drop, including the polarity of voltage Vf and current If.

4.2. Apply voltage in the opposite direction of the test circuit and record the voltage drop, including the polarity of voltage Vr and current Ir.

4.2.4 The contact resistance is equal to the absolute value of the voltage drop difference in the positive and negative directions divided by the sum of the absolute values of the positive and negative currents. The formula is as follows:

R=| Vf Vr |/(| If |+| Ir |)

Where: R=contact resistance Unit: ohm

Vf=positive pressure including polarity in volts

Vr=Reverse voltage drop including polarity, in volts

If=single test current unit: ampere

Ir=Reverse test current in amperes

4.2.5 Preventive measures

4.2.5. Before or during the test, the sample pressure shall not exceed 20200mV.

4.2.5. The total resistance (including contact terminal and main resistance) shall not be less than 1000m Ω.

4.2.5. Before the completion of the low-voltage resistance test between any pre state and environmental exposure, terminal contact must not be interrupted.

5.0 Details

When testing according to specifications, the following details should be explained:

(a) Number of tested samples

(b) The type and size of the wire

(c) Requirements for resistance

(d) Dimensions Y-Y (see Figure 2A)

6.0 Reference Documents

The data form should include:

(a) Test title

(b) Sample description

(c) Testing instruments used

(d) Test steps

(e) Evaluation and observation

(f) Test date and operator name

(g) Sample analysis.