10.1.3 Signal Test Board Pin Outs:
Description and Voltage Levels
The tables on the following pages list the pins located on
the signal test board. For each pin, its function,
description, and voltage levels are provided. Details on
performing tests using the test fixture are provided in the
section
Test Procedures
. Other than power supply
measurements, most of the signals being measured are
made up of waveforms.
Although in some cases, a digital voltmeter can be used to
verify the presence of such signals, it cannot be relied
upon to verify that the waveform is correct. An
oscilloscope is the instrument prefered. However, when
similar signals are being measured at multiple points, a
digital voltmeter can be used with some degree of
confidence. By comparing several signals to each other,
such as gate drive signals, and obtaining similar readings,
it can be concluded each of the waveforms match one
another and are therefore correct. Values are provided for
using a digital voltmeter for testing as well.
Special Test Equipment
High Power Service Manual for Modular F Frame Drives
126
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