Resistance Measurement - Sperry instruments SP-5A Operating Instructions Manual

the equipment under test.
3) Select the mAdc range that is higher than the maximum current
to be measured. If the maximum current is unknown, do not
attempt to take a measurement.
4) Remove power from the circuit to be tested and discharge any
capacitors and inductors.
5) Connect the test leads into the circuit so that the meter is in
series with the current where current is to be measured. The cur-
rent should enter through the red lead and leave through the black
lead in order for the meter to indicate in an upscale direction.
6) Turn on power to the circuit under test. Read the current on the
V-ma Scale and use the full-scale numbers, which correspond to
the range select. The 50 full scale numbers must be divided by
100 when using the 0.5 mAdc range.
7) Turn off the power to the circuit under test. Discharge all capac-
itors and inductors. Remove the test leads from the circuit under
test.
5-3) Resistance Measurements
1) Follow the Preparation for Use procedure in sec. 4.
2) Read all safety precautions in sec. 2.
Resistance measurements must be made on de-energized
(dead) circuits only. Impressing a voltage across the instrument
while set to any resistance range may result in electric shock,
instrument damage and/or damage to the equipment under test.
CAUTION
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