21
20
e.
Measuring Resistance
WARNING!
Do not attempt to make resistance measurements
with circuit energized. For best results, remove
the resistor completely from the circuit before
attempting to measure it.
NOTE:
To make accurate low ohm measurements, short
the ends of the test leads together and record the
resistance reading. Deduct this value from actual
readings.
Instrument set-up:
FUNCTION
BLACK
RED
MINIMUM
MAXIMUM
TEST LEAD
TEST LEAD
READING
READING
Ω
COM
V
Ω
Hz 0.1
Ω
40.00M
Ω
Measurement Procedure:
1.
Disconnect power to circuit to be measured.
2.
Plug black test lead into the
COM
input jack.
3.
Plug red test lead into
V
Ω
Hz input jack.
4.
Set the rotary switch on the 183 to the
function.
5.
Connect the test leads to the circuit to be
measured.
6.
Read the resistance value on the 183.
d. Measuring AC 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
circuits 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
umA
COM
mA
0.01mA
400.0mA
A
COM
A
0.001A
10.00A
Measurement Procedure:
1.
Disconnect power to circuit to be measured.
2.
Plug black test lead into the
COM
input jack.
3.
Plug the red test lead into the
mA
or
A
input
jack depending on the value of current to be
measured.
4.
Set the rotary switch to the
mA
or
A
function.
5.
Connect test leads in series to circuit to be
measured.
6.
Reconnect power to circuit to be measured.
7.
Read the current on the 183.
