The ASI-175 connects to the test plug on the front of the altimeter and quickly evaluates performance of the altimeter by monitoring and interpreting the outputs of various test points. The ASI-175 measures major power supply voltages and overall monitor performance by fault simulation. The Test Set also provides a swept altitude signal to check the operation of the altitude trips, it can initiate the test function, and provides the capability for checking the operation of the ground proximity warning system.

The Test Set is compact, lightweight, and enclosed in a sturdy plastic case. All power required to run the ASI-175 is supplied from the uut.