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OPERATING INSTRUCTIONS
ontinued
When the meters are first applied
to voltage, they both measure line-
to-ground voltage. This is indicated
in the displays by L-G.
Once one meter is applied to line-to-
ground voltage, it begins to wirelessly
search for a second meter. Any
DDPM-40 may connect with any
other DDPM-40 applied to voltage
in the area. When two meters have
established wireless communication,
moving dots will appear in the bottom
right corner of each display.
After a few seconds, both meters will
show line-to-line voltage, indicated in
the displays by L-L.
If they are out of phase, one meter
will show REF indicating it is the
reference phase and the other
meter will show the phase angle.
Here, the +120° indicates it is leading
the reference phase by 120°.
And here the -120° shows this meter
lagging the reference phase by 120°.
If the two meters are in phase, the
line-to-line voltage will be near zero
and one meter will again show REF
while the other phase indication will
show IN.
As soon as one meter is removed from
voltage, the wireless link is shut down
until the next time voltage is applied.
9
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