Electromagnetic relay contacts test equipment - is used for the analysis of contact bounce

摘要

Contacts (a, r, u, fu) of the relay (P) to be tested are connected through a connecting unit (A) to a first input to a gate circuit (T) which opens at the first change of position of the contacts. The second input to the gate circuit is connected to a generator (G) which supplies high frequency pulses needed to operate a counter (Z) during the open condition of the gate circuit. The counter is connected to a memory store (S) and a controller (K) which respectively stores the counter position and gives a read-out of its instantaneous position. A filter (F) may be used to prevent any measurement of contact bounce with a duration below a preset value. The equipment can measure the duration of contact bounce for any closing or opening contact, and the duration of contact change-over. During the measurement, the gate circuit (T) is opened at the initial change of position of the contact. The instantaneous position of the contact is then measured by the numerical count of the counter.