Iso-Tech IDM 103N Instruction Manual page 17

Note – Use the diode test to check the semiconductor junction
is good or bad. The Meter sends a current through the
semiconductor junction to measures the voltage drop across
the junction. A good junction drops between 0.4 V to 0.9 V.
Measuring DC mA, AC mA, DC A, AC A Current
And Frequency
 Warning
Never attempt an in–circuit measurement where The
open–circuit potential to earth potential is great than
500V, or example a 3-phase system measurement, you
may damage the Meter or to be injured.
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