Test Products International 183A - Manual (Page 10)

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f. MEASURING DIODES
CAUTION!
Do not attempt to make diode measurements with
circuit energized. The only way to accurately test
a diode is to remove it completely from the circuit
before attempting to measure it.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM VWHz 0.001V 2.000V
Measurement Procedure:
1. Disconnect power to the circuit to be measured.
2. Plug the black test lead into the COM input jack.
3. Plug the red test lead into the V WHz input jack.
4. Set the rotary switch to the function.
5. Connect black test lead to the banded end of the diode
and the red test lead to the non-banded end of the
diode.
6. Reading on the display should be between
0.5 and 0.8 volts.
7. Reverse test lead connections in 5 above.
8. Reading on the display should be OFL (Overload).
NOTE: If diode reads 0 in both directions, diode is short-
ed. If diode reads OFL in both directions, diode is open
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 press the
REL pushbutton. This value will automatically be
deducted from your reading.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
W COM VWHz 0.1W 40.00MW
Measurement Procedure:
1. Disconnect power to the circuit to be measured.
2. Plug the black test lead into the COM input jack.
3. Plug the red test lead into the V WHz input jack.
4. Set the rotary switch on the 183A to the W function.
5. Connect the test leads to the circuit to be measured.
6. Read the resistance value on the 183A.
Optional Functions:
RANGE
REC
REL
HOLD
Manually select the appropriate range.
Activate MIN/MAX record mode (page 24).
Activate REL mode (page 24).
Freeze the reading on the LCD.