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Typical Results

Channel HI (OHMS) LO (OHMS) GU (OHMS)

0.51

0.49

0.48

0.42

0.52

0.49

0.46

0.49

0.47

0.51

0.43

0.45

0.50

0.48

0.52

0.43

0.44

0.50

0.35

0.31

0.41

0.39

0.41

0.35

0.40

0.36

0.40

0.35

0.36

0.33

0.39

0.41

0.36

0.41

0.38

0.40

0.61

0.59

0.57

0.61

0.55

0.59

0.60

0.54

0.55

0.60

0.61

0.55

0.58

0.60

0.55

0.54

0.51

0.55

0.61

Test 2-2: DC Isolation Test

This test verifies that sufficient DC isolation exists at various points on the

multiplexer. DC Isolation is checked from HI to Chassis, HI to LO, and HI

to GU (GUARD). This test uses the test fixture (see Figure 2-1).

NOTE

The DMM used should be capable of measuring at least 1 GΩ. 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 3458A, a typical return for an overload is 1.E+38 and the entry in Table

2-2 should be >1.2 GΩ.

Chapter 2 Verification Tests 33

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