Simpson 270 Series - Page 38

Operation
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. Turn power on.
g. For the
2.5V range read the value directly on the scale
marked 2.5 VAC. For the 10V, 50V, and 250V ranges, read
the red scale marked AC and use the black figure immediately
above the scale. For the 500V range, read the red scale marked
AC and use the 0-50 figures. Multiply the reading by 10.
NOTE: Turn off power to the circuit and wait until the
4.11
meter indicates zero before disconnecting the
test leads.
AC VOLTAGE MEASUREMENT 0-1000V RANGE
WARNING
Be extremely careful when working in high voltage
circuits. Do not handle the Instrument or test leads
while the circuit being measured is energized. OB-
SERVE ALL SAFETY PRECAUTIONS in paragraph 4.2
and in the instruction manual for the equipment being
tested.
Do not attempt any circuit-to-ground voltage measure-
ment which may exceed 1000 volts.
Be sure that the range switch is set to the 500V/1000V
range, function switch to AC position, and test leads
connected to common and 1000V jack.
Do not touch the Instrument or test leads while the
power is on in the circuit being measured.
a. Set the function switch at AC (Figure 4-3).
b. Set the range switch at 500/1000V position.
4-12