Simpson 260 Series - Resistance Measurement Procedures; Steps for Measuring Resistance

Operation
418 RESISTANCE MEASUREMENTS
CAUTION
e Voltage applied to a resistance range will cause read-
ing errors if low and damage the Instrument if high.
When making in-circuit measurements, make certain
that the circuit is completely deenergized before mak-
ing connections to it.
e When making in-circuit measurements, circuit paths in
parallel with the resistance being measured may
cause reading errors. Check circuit diagrams for
the presence of such components before assuming
that the reading obtained is correct.
4.18.1 When resistance is measured, the INTERNAL batteries
ВІ and B2 furnish power for the circuit. Since batteries are sub-
ject to variation in voltage and internal resistance, the Instrument
must be adjusted to zero before measuring a resistance, as follows:
a. Turn range switch to desired ohms range.
b. Plug the black test lead into the — COMMON jack and the red
test lead into the + jack.
c. Connect ends of test leads together to short the VOM resistance
circuit.
d. Rotate the ZERO OHMS control until pointer indicates zero
ohms. If pointer cannot be adjusted to zero, one or both of
the batteries must be replaced. (For battery replacement, refer
to Section V.)
e. Disconnect shorted ends of test leads.
4.19 | MEASURING RESISTANCE
a. Before measuring resistance in the circuit make sure the power
is off to the circuit being tested and all capacitors are dis-
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