KYORITSU 1109S - Manual (Page 14)

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6-2. DC Voltage Measurements
# WARNING
When measuring a high voltage greater than 250V, turn off power
to the circuit under test 8.nd follow the steps as described below.
Then, turn on power to the circuit being measured and proceed
with the voltage measurements. Be careful not to touch the wiring,
test leads and the instrument during voltage measurements. After
making measurements, turn off power to the circuit under test and
disconnect the test leads.
# WARNING
Never use the instrument on a high voltage power line carrying
more than 250V.
# WARNING
Never make voltage measurements with the range selector
switch set to the DC mA or ohm range position or the test lead
erroneously connected to the AC 15A terminal. This may not only
damage the instrument or blow the fuse, but also cause an injury
to the operator.
Applications:
Measuring voltage on batteries, electrical appliances, bias voltage of IC
of transistor circuits and any other DC voltages.
⑴ Insert the red test lead into the + terminal of the instrument and the
black test lead into the −COM Terminal.
⑵ Set the range selector switch to the desired DC voltage range
position. .
⑶ Connect the red test lead to the positive (+) side of the circuit under
test and the black test lead to the negative (-) side of the circuit (in
parallel with the circuit).
⑷ If the measured voltage is less than 250V, set the range selector
switch to the lower voltage range position for more accurate reading.