Reading Code With an Analog Voltmeter

Fig. 28 Code interpretation using analog voltmeter:

When a service code is reported on the analog voltmeter for a functional test, it will represent itself as a pulsing or sweeping movement of the voltmeter's needle across the dial face, Fig. 28. A single digit of three will be reported by three needle pulses (sweeps). However as previously stated, a service code is represented by a two digit number, such as 2-3. The self-test service code of 2-3 will appear on the voltmeter as two needle pulses (sweeps), then after a two second pause, the needle will pulse (sweep) three times. The continuous testing codes are separated from the functional codes by a six-second delay, a single half-second sweep and another six-second delay. They are produced on the voltmeter in the same manner as the functional codes.