1. Basic inspection items
Electrical contact resistance detection
Electrical contact resistance is one of the important indicators for measuring contact quality, and is usually measured using a high-precision milliohm meter. The Electrical contact resistance value is indirectly obtained by measuring the voltage drop across the two ends when the contact is closed, and compared with the set standard range.
Arc current and arc time detection
The JF04C electrical contact material test system can simulate the contact-breaking action. Under the set closing pressure, contact spacing, action frequency, and other conditions, the arc current, arc voltage, arc time, and energy parameters are detected to evaluate the durability of the contact material.
Hydrogen sulfide and sulfur dioxide corrosion test
According to GB/T 2423.19-2013 and GB/T 2423.20-2014 standards, hydrogen sulfide and sulfur dioxide corrosion tests are carried out on the Solid Silver Contacts to evaluate their stability in harsh environments.
Auxiliary contact feedback detection
Auxiliary contact feedback is an internal detection method that judges the state of the relay itself by observing the state changes of the auxiliary Plated Contacts. Although this method is not widely used in practice, it has a certain degree of reliability.
Harness terminal voltage drop test
The essence of the harness terminal voltage drop is the contact resistance generated when the terminal is crimped with the wire. The resistance measurement method can be used to indirectly measure the harness terminal contact voltage drop, which is simple to operate and can be completed with only a high-precision milliohm meter.
2. Automated detection device
With the development of technology, automated detection devices have gradually become mainstream. For example:
High-speed industrial camera detection system
This system is suitable for online detection of contact gap (GAP value) and contact centering detection on the production line, measuring contact process size parameters, which is conducive to capturing contact defects caused during the production process.
Automated detection device for electrical control circuit board contacts
It includes a base plate and an operating compartment fixed at the upper end of the base plate, which can automatically detect the contacts on the electrical control circuit board to improve detection efficiency and accuracy.
3. Special inspection method
Magnetic blowout arc extinguishing detection
For relays that need to extinguish arcs, the magnetic blowout arc extinguishing method can be used for detection. By observing the influence of the permanent magnet placement direction on the contact polarity, it is possible to determine whether the Electrical contact is working properly.
Instantaneous on-off measuring instrument
This type of instrument is a multi-channel test and detection equipment, which can have up to 50 measurement channels. It simulates the action of relay Moving Contacts in actual work and fully meets the measurement requirements of this type of special equipment.