Amprobe DM-4 Power-Quality-Recorder - Manual (Page 39)

11.3 USING THE INSTRUMENT IN A THREE PHASE 3- WIRE SYSTEM (DELTA)
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Instrument connection in a 3 wires three-phase system (DELTA)
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38
DM-4 Power Quality Recorder
CAUTION
The maximum voltage between V1, V2, V3 and COM (L2) inputs is
CATIII 600V~ phase-phase. Do not measure voltages exceeding the
limits prescribed by this manual. Should you exceed the voltage limits
you could damage the instrument and/or its components or endanger
your safety.
CAUTION
Please note that in this case the yellow cable (neutral) is connected with
the red cable on phase 2. You can use any phase you want as reference.
CAUTION
If possible, before connecting the instrument to the electrical equipment
to be tested take the power supply off the electrical equipment.
Phase 1
Phase 2
Phase 3
Black
Red
Blue