Dry Buzzing of Reed Switches
After Tin plating of the reed switch leads, the next step is Dry buzzing. Buzzing stabilizes the contact and also stabilizes any minor physical alignment defects. By operating the Reed Switches at no load condition, at special multiple high frequencies, the “buzz” adds the required contact area stability.
As the reed switches are not connected to any load during this operation, there is no load wear-out of the Reed Switch contacts. The number of operations that a reed switch needs to be buzzed depends on the design of the reed switch and smaller reed switches may require more buzzing operations. Reed Switches with better blade-glass-seal alignment also require less buzzing than ones with slight misalignment, but still within tolerance. Static Contact Resistance and Variable Contact Resistance drop after dry buzzing, which indicates a more stable contact. Buzzing more than required will be counter productive and will slowly lead to higher contact resistance levels.