Keysight VXI Bus 75000 C Series, Service Manual

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Keysight E1463A 32-Channel Form C Switch Service Guide 33
Test 2-2: DC Isolation Test Verification Tests
Test 2-2: DC Isolation Test
This test verifies that sufficient DC isolation exists at various points on the
Module. DC Isolation is checked from NO to NC, NO to Chassis, and NC to
Chassis. This test uses the test fixture (see Figure 2-1).
The DMM used should be capable of measuring at least 1 G  . If
the DMM indicates an overload, record the reading as >Rmax,
where Rmax is the highest resistance that the DMM can measure.
For example, if the DMM is an Keysight 3458A, a typical return for
an overload is 1.E+38 and the entry in Table 2-1 should be
>1.2 G

.
Figure 1-7
NC to NO Isolation