
Meter
168
17.4 Diode
The
Meter
function can also be used to test the function of a diode. To test a diode using the meter
function, the diode is connected to the metter input positive to anode, negative to cathode for forward-
biased diodes, and positive to cathode, negative to anode for reverse-bias diodes. The meter will then
measures the voltage drop across the diode.
In forward bias mode, a value falling between 0.6 to 0.7 indicates a healthy and ideal state of the diode
if it’s a silicon diode. The value will show in between the range of 0.25 to 0.3, in the case of germanium
diodes, while in reverse bias mode, there should be no or very little current flowing through the diode.
The diode test is useful for verifying the polarity and health of diodes in electronic circuits.
Reversing the condition of the diode by connecting the will prevent current flow through the device. The
meter will indicate the
Overload
in the case of a healthy diode indicating an open circuit. The meter
showing irrelevant values indicates that the diode is defective, maybe open or short. No current flows
through an open diode. It’s pretty much like an open switch that allows zero current to flow through the
diode.
When the voltage drop across the diode is zero, it will indicate the flow of current and is called a shorted
diode. In such a case, zero voltage value is indicated on the meter.
Step 1.
Press the
key.
Step 2.
Press the
softkey to view the available metering option.
• Use the
to select
"Diode."
.
Figure 17.3
Diode Measurement
Содержание 2510B Series
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