10
To avoid possible damage to the meter or to the equip-ment under test,
disconnect circuit power and discharge all high-voltage capacitors before
measuring resistance.
Note – The meter provides an open voltage ≦–1.5V to the circuit under test that
causes the diode or transistor junction to conduct, so it is better to disconnect the
resistance from the circuit to get a correct measurement.
The resistance of test leads is about 0.1Ω ~ 0.2Ω. To test the leads resistance, touch
the probe tips together. For accurate measurement in low resistance.
R
UNKNOWN
= R
MEASUREMENT
- R
TEST LEAD
Caution
Measuring DC µA, DC A, AC A Current
Never attempt an in–circuit measurement where the open–circuit potential
to earth potential is greater
than 500V for
example a 3-phase system
measurement; you may damage the meter or be injured.
Warning
(Not IDM 71)
Making Basic Measurements
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