GW Instek GDM-398 - Manual (Page 31)

GDM-360/397/398/461 User Manual
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 Connect the test leads to the proper terminals as said above to avoid errors. The
LCD will display OL to indicate that the diode being tested is open or that the
polarity is reversed.
The Meter will display the forward voltage drop in voltage
(V) units.
 When diode testing has been completed, disconnect the connection between the
testing leads and the circuit under test, and remove the testing leads away from
the input terminals of the Meter.