18
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/µ
A
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
•
HOLD:
Freezes the reading on the LCD.
19
position.
Measuring Continuity
WARNING!
Do not attempt to make continuity measurements with circuit
energized. Make sure the temperature probe is NOT plugged
in during this test.
Instrument set-up:
FUNC.
BLACK RED
TEST LEAD
TEST LEAD
COM
V/
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
input jack.
4.
Set the rotary switch to the
position.
5.
Connect test leads to circuit to be measured.
6.
The 265 will beep and the LED will illuminate at
resistances of 35
Ω
or lower.
Optional Modes
•
HOLD:
Freezes the reading on the LCD.
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