Patent ID: 8686737
Filing Date: 2014-04-01
Classification: G01R

Abstract:
1. A diagnostic circuit for connecting to a unit under test having a load and two lines of a sinusoidal source, the diagnostic circuit comprising: a voltage sensing device having a first input and a second input; terminals including first terminals for connecting to the load and second terminals for connecting to the two lines of the sinusoidal source; relays each connected between one of said second terminals and one of said first terminals for connecting the sinusoidal source to the load; a D/C voltage source and ground; a first diode pair having a first clamping diode connected between said D/C voltage source and said first input and a second clamping diode connected between said ground and said first input; and a second diode pair having a first clamping diode connected between said D/C voltage source and said second input and a second clamping diode connected between said ground and said second input.