Abstract: Equipment is provided to test an electrical device, e.g. solenoid, or heater that effects an operation, e.g. movement of a valve, heating etc. To perform a test, the equipment actuates the device to cause the operation to commence. When the operation has proceeded to a predetermined extent, or after a predetermined time, whichever occurs first, a signal is produced which causes de-actuation of the device thus stopping the operation. A signal is also produced to indicate whether it was the elapse of the specified time or the operation proceeding to the specified extent that caused de-actuation. The equipment is particularly suited for testing a device forming part of a trip system.

Abstract: A system for monitoring a plurality of identified electric signals and the order in which they occur, comprising an electric pulse generator which generates an electric pulse upon receiving each electric signal, a serial counter which is incremented upon receiving an electric pulse from the generator, a data latch pulse system associated with each electric signal and which operates upon receiving the electric signal, a parallel data latch system which is operated by the data latch pulse system, and which accepts and holds the serial data held in the serial counter upon receiving the electric signal, a display decoder connected to the output of the parallel data latch system, and at least one display unit connected to the display decoder and displaying the number held in the serial counter upon receiving the electric signal.