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Application Notes
Disconnect power from the terminal
block, find the fuse or circuit breaker that
controls the block and turn it off.
Set up the meter following the steps
under “Measurement Procedure” on
page 13. Then proceed with the
following:
• Connect the red test lead to the hot side of the
block and the black lead to the neutral side of the
block. Reconnect power to the block and read the
voltage on the meter. The reading should be
approximately 110V to 130V.
• Disconnect power from the block and move the
red wire to ground. Reconnect power to the
block and read the voltage on the meter. Typically
less than 20V should exist from neutral to
ground. If 110V or above exists, the block may
be wired incorrectly.
1312
b. Measuring AC Volts (cont.)
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into COM input jack.
3. Plug red test lead into VΩ input jack.
4. Set the rotary switch on the 135 to the desired range
in the ACV function depending on the voltage to be
measured.
5. Connect test leads to circuit to be measured.
6. Reconnect power to circuit to be measured.
7. Read the voltage on the 135.
c. Measuring DC Amps
CAUTION!
Do not attempt to make a current measurement with the
test leads connected in parallel with the circuit to be
tested. Test leads must be connected in series with the
circuit.
WARNING!
Do not attempt to make a current measurement of cir-
cuits with more than 600V present. Instrument damage
and/or personal injury may result.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
DCA COM mAµA 0.1µA 1.999A
(up to 2mA range)
DCA COM A 0.01A 10.00A
(10A range only)
b. Measuring AC Volts
CAUTION!
Do not attempt to make a voltage measurement if a test lead is
plugged in the A or µmA input jack. Instrument damage and/or
personal injury may result.
W
ARNING!
Do not attempt to make a voltage measurement of more than
1000V or of a voltage level that is unknown.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
ACV COM VΩ 0.1mV 750V