Peak Atlas DCA Pro User Guide June 2019 – Rev 1.7
Page 8
Diodes
The DCA Pro will analyse almost any type of diode. Any
pair of the three test clips can be connected to the diode, any way
round. If the unit detects a single diode, a message similar to the following
will be displayed:
In this example, the Cathode (symbol of
K) is connected to the Green test clip
and the Anode (symbol of A) is
connected to the Blue test clip,
additionally, the Red test clip is unconnected.
The forward voltage drop is also displayed; this gives an indication of the diode
technology. In this example, it is likely that the diode is a standard silicon
diode. A germanium or Schottky diode may yield a forward voltage of about
0.25V. The current at which the diode was tested is also displayed. Unlike most
multimeters that don’t have a defined diode test current, the DCA Pro typically
tests diodes (PN junctions) at a forward current of 5mA. You can test at
different currrents by performing an I/V graph using the PC software.
will detect only one diode even if two diodes are
connected in series when the third test clip is not connected to the
junction between the diodes. The forward voltage drop displayed
however will be the voltage across the whole series combination.
will determine that the diode(s) under test is an LED if
the measured forward voltage drop exceeds 1.50V. This has no effect on
the readings displayed other than the LED message instead of Diode
message. Please refer to the section on LED analysis for more
information.
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