26
g. 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/
Ω
input 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.
9
3. Specifications
IEC 1010 Over Voltage:
CAT II - 1000VDC, 600VAC
CAT III - 600V
Pollution Degree 2
※
INSTALLATION
Ⅰ·Ⅱ·Ⅲ
INSTALLATION CATEGORY(OVERVOLTAGE
CATEGORY)
Ⅰ
: Signal level, special equipment or parts of
equipment, telecommunication, electronic
etc., with smaller transient overvoltages
than INSTALLATION CATEGORY
Ⅱ
INSTALLATION CATEGORY(OVERVOLTAGE
CATEGORY)
Ⅱ
: Local level, appliances, PORTABLE
EQUIPMENT etc., with smaller transient
overvoltages than INSTALLATION
CATEGORY
Ⅲ
INSTALLATION CATEGORY(OVERVOLTAGE
CATEGORY)
Ⅲ
: Distribution level, fixed installation, with
smaller transient overvoltages than
INSTALLATION CATEGORY
Ⅳ.
UL 3111-1
