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6.8. Checking diodes
This function lets you check diodes and other semiconductors for opens
and shorts. It also lets you determine the forward voltage for diodes. You
can use this function when you need to match diodes.
1. Set the rotary selector to the diode position.
2. Plug the black test lead into your meter's COM terminal and the
red test lead into your meter's V//COM/Hz/Temp.- terminal.
3. Connect the test leads to the diode you want to check and note the
meter reading.
Notes:
*
If
the
display
germanium diode or 0.5 for a silicon diode, reverse the diode. If
the meter indicates and overrange, the diode is good. The displayed
number is the diode's actual forward voltage (up to 2.0 volts).
If the display indicates an overrange condition "OL", reverse the
*
polarity of the connection. If the display shows a value, the device is
good. The displayed value is the component's actual forward
voltage (up to 2.0 volts). If the display still indicates an overrange
condition, the device is open.
*
If the display shows a value both before and after you reverse the
polarity, the device is shorted.
When you connect the diode to the meter and the meter displays the
devices forward voltage, the red test lead is connect to the diodes anode,
and the black test lead is connected to the diode's cathode. This meter
supplies enough forward voltage to light most LED´s. However, if the
LED's forward voltage is greater than 2.0 volts, the meter incorrectly
indicates that the device is open.
shows
a
value
-43-
for
example
0.2
for
a
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