By Design World
Servometer‚Â® ‚â€“ PMG, LLC introduces Gold Plated Bellows Contacts, an alternative to spring loaded type test pins for the next generation of high frequency test applications. Servometer‚Â® contact springs are manufactured from electrodeposited nickel and gold plated to ASTM-B-488 to enhance their conductivity, and provide extremely low DC resistance with a minimum of insertion loss. They have been designed to provide lifetime spring and force repeatability. Servometer contacts are rated for a maximum current of 4 amps.
Typical bellows have a low loss of only .20 dB (shorter) to .45dB (longer) at 6 GHz with a total bandwidth much higher. As you will notice from the data above length does matter with regard to test pins, so the shorter the part the better.
Mechanically the advantage of ‚â€œbellows‚â€ over the spring loaded type test pins are:
‚â€¢ Servometer bellows are all one piece construction and are a natural springs, and therefore have no moving parts to bind or cause extra unwanted resistance or impedance issues.
‚â€¢ Servometer bellows can typically be made down to .020 inch (0.5 mm) in diameter. This becomes more critical as PCB densities increase and test pins are located closer and closer to each other.
‚â€¢ 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.
Because Servometer‚Â® bellows are made by Electrodeposition, the bellows can be made out of different materials. Thus, the conductivity of bellows at high frequencies from the Giga-Hertz range and up is superior to similar sized spring loaded test pin. Bellows can be made with Nickel, Copper, Gold or Silver for maximum performance. Servometer specializes in custom designed bellows. Servometer‚Â® bellows are ROHS compliant.