What is the terminal line reliability test? What items are included?

Date：2021-09-17 17:45:00 Views：1868

In order to ensure the application quality and safety factor of wiring terminals and prevent the occurrence of redundant common faults, it is proposed to scientifically study and formulate relative selection technical standards according to the technical standards of commodities and carry out purposeful reliability detection to prevent invalid. The terminal line inspection generally involves the following items: plugging force test, durability test, insulation resistance test, vibration test, mechanical impact test, cold and hot impact test, mixed gas corrosion test, etc.

The specific test items of terminal wires are as follows:

（1） Terminal line plugging force test

Purpose: to verify whether the plugging force of terminal wire meets the requirements of product specifications.

Principle: fully insert or pull out the terminal wire at the specified rate, and record the corresponding force value.

（2） Terminal wire durability test

Objective: To evaluate the impact of repeated plugging on terminal wires and simulate the plugging status of terminal wires in actual use.

Principle: continuously plug and unplug the terminal wire at the specified rate until the specified number of times is reached.

（3） Insulation resistance test of terminal line

Purpose: to verify whether the insulation performance of the terminal line meets the requirements of circuit design or whether its resistance value meets the provisions of relevant technical conditions when it is subjected to environmental stresses such as high temperature and humidity.

Principle: apply voltage to the insulating part of the terminal line, so as to generate leakage current on the surface or inside of the insulating part.

（4） Terminal line withstand voltage test

Objective: to verify whether the terminal line can work safely under rated voltage and withstand overvoltage, so as to evaluate whether the insulation material or insulation gap of the terminal line is appropriate.

Principle: apply the specified voltage between the terminal line contact and the contact, and between the contact and the shell for the specified time, and observe whether the sample has breakdown or discharge.

（5） Terminal line contact resistance test

Purpose: to verify the resistance value generated when the current flows through the contact surface of the contact.

Principle: measure the voltage drop at both ends of the terminal line by applying the specified current to the terminal line, so as to obtain the resistance value.

（6） Terminal line vibration test

Objective: to verify the effect of vibration on the performance of terminal wire and its components.

Vibration type: random vibration, sinusoidal vibration.

（7） Mechanical impact test of terminal wire

Purpose: to verify the impact resistance of terminal wire and its components or to evaluate whether its structure is firm.

Test waveform: half sine wave, square wave.

（8） Cold and thermal shock test of terminal wire

Objective: To evaluate the effect of terminal wire on its functional quality under rapid large temperature difference.

（9） Combined cycle test of temperature and humidity of terminal line

Objective: To evaluate the effect of terminal wire stored in high temperature and humidity environment on the performance of terminal wire.

（10） High temperature test of terminal wire

Objective: To evaluate whether the terminal and insulator properties change after the terminal wire is exposed to high temperature environment for a specified time.

（11） Salt spray test of terminal line

Objective: To evaluate the salt spray corrosion resistance of terminal wires, terminals and coatings.

（12） Mixed gas corrosion test of terminal wire

Objective: To evaluate the corrosion resistance of terminal wire exposed to different concentrations of mixed gas and its effect on its performance.

（13） Terminal wire rocking test

The resistance value presented by applying voltage to the insulating part of the terminal line so that leakage current is generated on the surface or inside of the insulating part.

Verify whether the terminal line can work safely under the rated voltage and withstand the over potential, so as to evaluate whether the insulation material or insulation gap of the terminal line is appropriate.

In conclusion, reliability is an important quality index, but qualitative description is not enough. It must be quantified in order to describe and compare. The development of reliability engineering can drive and promote the development of product design, manufacturing, use, materials, technology, equipment and management,Ensure that the performance meets the standardElectronic products have been raised to a new level.