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Gold-plated Bellows for Test
June 27, 2008 |Estimated reading time: 1 minute
CEDAR GROVE, N.J. Servometer PMG LLC introduces Gold Plated Bellows Contacts, an alternative to spring-loaded test pins for next-generation high-frequency test applications. Servometer contact springs are manufactured from electrodeposited nickel and gold plated according to ASTM-B-488 to enhance their conductivity, and provide low DC resistance with minimal insertion loss.
The test contacts are designed to provide lifetime spring and force repeatability. Servometer contacts are rated for a maximum current of 4 A. Typical bellows have a low loss of 0.20 dB (shorter) to 0.45 dB (longer) at 6 GHz with a total bandwidth much higher. Length does matter with regard to test pins, so the shorter the part the better.
Mechanically, the advantages of Servometer Bellows over spring-loaded test pins reportedly include one-piece construction with natural spring force. This eliminates moving parts that can bind or cause extra unwanted resistance or impedance issues. The bellows can typically be made as small as 0.5 mm in diameter for denser PCBs.
If required, the bellows could be coated with noise reduction materials to reduce crosstalk between test pins in close proximity, with little or no loss of mechanical capabilities. The bellows are made by electrodeposition, with different materials possibilities that make conductivity at high frequencies comparable to similar-sized spring-loaded test pins. Bellows can be made with nickel, copper, gold, or silver and are ROHS compliant.
For more information, visit www.servometer.com.