Test Products International 293 - Manual (Page 23)

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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:
FUNC. BLACK RED MIN MAX
TEST LEAD TEST LEAD READING READING
COM V/ Ω 0.001V 2.000V
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug the black test lead into COM input jack.
3. Plug red test lead into the V/ Ωinput jack.
4. Set the rotary switch to the function.
5. Connect the 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
shorted. If diode reads OFL in both directions, diode
is open.
e. Continuity Buzzer
WARNING!
Do not attempt to make continuity measurements with
circuit energized.
Instrument set-up:
FUNC. BLACK RED MIN MAX
TEST LEAD TEST LEAD READING READING
Ω COM V/ Ω 0.001K Ω 4.000KΩ
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 Ω input jack.
4. Set the rotary switch to the Ω Ω function.
5. Press the FUNC button until is on the LCD.
6. Connect test leads to circuit to be measured.
7. Listen for the buzzer to confirm continuity.
Optional Modes
•
HOLD: Freezes the reading on the LCD.
• TRIM: Push TRIM button to stabalize reading.
!