Abstract: A method and apparatus for verifying the seismic integrity of a lead of an electronic component contained in an electric circuit wherein: a force of a desired magnitude is applied to the lead of the electronic component with the magnitude corresponding to the expected maximum force which would be exerted on the lead by an earthquake, and an indication is provided when the lead has been subjected to the applied force for a given period of time corresponding to the approximate period of time the maximum force of an earthquake would be exerted on the lead. Moreover, the force is released if the desired magnitude has been applied for a further preset period of time which is greater than the given period of time, or if the magnitude of the applied force exceeds a preset maximum value.

Abstract: A contact chatter detector includes a bipolar power supply and a switching system which permits the fixed contacts of a relay under test to be connected either to the positive or the negative terminal of the power supply, the movable contacts of the relay under test being grounded. Depending upon the switch position and whether or not chatter is present, the fixed contacts may be at ground potential, a positive potential, or a negative potential. Binary gates continuously monitor the fixed contacts, and are able to accommodate the three input states by receiving power from power supply translation circuits which effectively adjust the gates to be responsive to the negative potential and ground at one switch position and to ground and the positive potential at another switch position. Interruption alarms connected to the gates determine whether chatter exceeds a predetermined minimum, regardless of the rate at which the chatter pulses occur.