25
d. Turn the power on. Read the current directly on the black DC scale. Use the
0-10 figures to read directly in amperes.
e. Turn the power off and disconnect the test leads.
!
The 10A range is not internally fused in the 260-8.
When using the 10A range, never disconnect a test lead from a jack
or from the circuit while the circuit is energized. Doing so may likely
damage the test jacks or leads and the arcing may be hazardous to
the operator. Turn off circuit power and wait for the meter reading to
drop to zero.
The polarity reversing feature of the function switch does not operate
on the 0-10A range. If polarity is found to be incorrect, turn off circuit
power, wait for the meter indication to reach zero and then interchange
test lead connections to the circuit.
4.20 Resistance Measurements
Voltage applied to a resistance range will cause reading errors if low
and damage the Instrument if high. When making in-circuit measure-
ments, make certain that the circuit is completely de-energized be-
fore making connections to it.
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 assum-
ing that the reading obtained is correct.
When resistance is measured, the batteries furnish power for the circuit. Since
batteries are subject 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 the 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 test leads.
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