8.1.3 Signal Test Board Extension
The signal test board extension is designed to be used
with the signal test board. The extension can be plugged
into the connector where the signal test board would
normally connect. The signal test board will then plug into
the extension board. When the extension board is used,
the measurement terminals on the signal test board are
easier to reach.
Figure 8.2 Signal Test Board Extension
8.1.4
Signal Test Board Pin Outs
Table 8.1 lists 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 chapter 6 Test Procedures of this manual.
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 preferred instrument. When similar
signals are being measured at multiple points, a digital
voltmeter can be used with some degree of accuracy. By
comparing several signals to one another, such as gate
drive signals, and obtaining similar readings, it can be
concluded that 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
Service Manual
MG94A222 Danfoss A/S © Rev. 2014-02-10 All rights reserved. 121
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