Using Conductance For High Resistance Or Leakage Tests - Fluke 88 V User Manual

Model 88 V
Users Manual
Using Conductance for High Resistance or
Leakage Tests
Conductance, the inverse of resistance, is the ability of a
circuit to pass current.
The Meter's 60 nS range measures conductance in
nanosiemens (1 nS = 0.000000001 Siemens). Because
such small amounts of conductance correspond to
extremely high resistance, the nS range lets you determine
the resistance of components up to 100,000 MΩ, 1/1 nS =
1,000 MΩ. This test might be used to test DIS coil packs
on a car.
To measure conductance, set up the Meter as shown for
measuring resistance (Figure 4); then press Cuntil the
nS indicator appears on the display.
The following are some tips for measuring conductance:
•
High-resistance readings are susceptible to electrical
noise. To smooth out most noisy readings, enter the
MIN MAX recording mode; then step to the average
(AVG) reading.
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•
There is normally a residual conductance reading
with the test leads open. To ensure accurate
readings, use the relative (REL) mode to subtract the
residual value.