Test Products International 275 - Manual (Page 21)

Measuring Capacitance
WARNING!
All capacitance measurements are to be made on de-energized
circuits with all capacitors discharged only. Failure to de-energize
and discharge capacitors prior to measuring them could result in
instrument damage and/or personal injury. Make sure the temper-
ature probe is NOT plugged in during this test.
Instrument set-up:
FUNC. BLACK RED
TEST LEAD
TEST LEAD
COM V/ Ω/µA
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
input jack.
4. Set the rotary switch to the
5. Remove the capacitor from the circuit and discharge it.
6. Connect test leads to the capacitor to be measured.
Observe polarity on polarity sensitive capacitors.
7. Read the capacitor value on the LCD.
Optional Modes (See Other Features Section)
• D-H: Freezes the reading on the LCD.
21
position.
Measuring Diodes
WARNING!
Do not attempt to make diode measurements with the circuit
energized. For accurate tests, remove the diode completely
from the circuit prior to measuring it. Make sure the tempera-
ture probe is NOT plugged in during this test.
Instrument set-up:
FUNC. BLACK RED
TEST LEAD
TEST LEAD
COM V/ Ω/µA
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
input jack.
4. Set the rotary switch to the
5. Connect the black test lead to the banded end of the diode
(cathode) and the red test lead to the non-banded end of
the diode (anode).
6. For a good diode, the reading on the display should be
between 0.5V and 0.8V. The reading will be lower for a
germanium diode.
7. Reverse the leads on the diode.
8. For a good diode, the reading on the display should be OL
(overload).
Optional Modes (See Other Features Section)
• D-H: Freezes the reading on the LCD.
position.