10
OPERATING INSTRUCTIONS
continued
Test Point Measurements
To activate Test Point mode simply push the ON
button again. Test Point mode is indicated by TP
in the display. To turn Test Point mode off, simply
press the ON button again to continue cycling
through functional modes. When using a DDPM-40
to phase between test points, the important measurement is whether high voltage
is present or not. The proper procedure for phasing between elbow test points is
as follows:
1) Both elbows must be energized. Follow the proper safety practices for removing the
test point protective caps and exposing the live test points. Treat all exposed electrodes
as energized high voltage. Measure from both elbow test points to ground. These
measurements should show that both elbows are energized and, if both elbows are of
the same type and manufacture, should measure the same approximate line voltage.
2) Measure from one elbow test point to the other. This reading will show either a
high voltage reading indicating the elbows are out-of-phase or a zero or low voltage
reading indicating the elbows are connected to the same phase. The in-phase voltage
measurement can be between zero and 15% of the nominal line-to-ground voltage.
If both elbows are of different type and manufacture, then the reading may be higher.
Peak Hold
Press the ON button to activate this
feature and once again to clear the
reading. The H in the display confirms
Peak Hold. The display will hold the
highest reading while Peak Hold is
activated.
NOTE:
The meter will not shut
off while a peak reading is displayed.
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