20
c. Plug the black test lead into the – COMMON jack and the red test lead into
the + jack.
d. Turn off power to the circuit to be measured and discharge any capacitors.
e. Connect the test leads across the circuit voltage to be measured with the
black lead to the grounded side.
f. For the 2.5V range read the value directly on the scale marked 2.5 VAC. For
the 10V, 25V, 50V and 250V ranges, read the red scale marked AC and use
the black figure immediately above the scale.
4.12 AC Voltage Measurement 0-500V Range
Be extremely careful when working in high voltage circuits. Do not handle the
Instrument or test leads while the circuit being measured is energized. OBSERVE
ALL SAFETY PRECAUTIONS in paragraph 4.2 and in the instruction manual for
the equipment being tested.
Do not attempt any voltage measurement which may exceed 1000
volts or the circuit-to-ground voltage of the Instrument, 1000 volts
maximum.
Be sure that the range switch is set to the 250V/500V/1000V range,
function switch to AC volts only position, and test leads connected
to common and 500V jack.
Do not touch the Instrument or test leads while the power is on the
circuit being measured.
Before proceeding with the following steps, review the Safety Precautions in Para-
graph 4.2.
a. Set the function switch to AC Volts Only position (Figure 4-6).
When making AC voltage measurements with the function switch
incorrectly set to DC, the Instrument pointer will remain at or near
zero, indicating a false “no voltage present” condition that could be
hazardous.
b. Set the range switch at 250V/500V/1000V position.
c. Plug the black test lead into the – COMMON jack and the red test lead in the
500V jack.
d. Be sure the power is off in the circuit being measured and that all its capaci-
tors have been discharged.
e. Connect the test leads across the circuit voltage to be measured with the
black lead to the grounded side.
f. Turn on the power in the circuit being measured.
g. Read the voltage on the red scale marked AC. Use the 0-50 figures and
multiply by 10.
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