Voltage Measurements - Line-To-Ground; Test Point Measurements - HDE DigiVolt DVM-80UVM Operating Instructions Manual

OPERATING INSTRUCTIONS
the use of two person crews allows each person to operate one meter stick and maintain
high safety standards.
In order to make line-to-line measurements, each probe must contact an energized line.
Be sure that only those probes intended for the particular application are used (see page
9). Always keep the connecting cord free and clear of energized phases and ground.
For phasing applications, the probes will be placed on opposite sides of an open point,
typically a switch. The phasing operation will indicate if two sides of a line are in-phase
before closing a switch.
To check all phases, proceed as follows:
1) Measure voltage on each phase from line-to-ground to verify all phases are
live and at the same voltage.
2) Place one of the probes on a conductor on one side of the switch.
3) Place the other probe on one of the three phases on the other side of the switch.
4) If the conductors are out-of-phase, the meter will read line-to-line voltage.
If they are in-phase, the meter will read near zero but may read up to 15% of
the line-to-line voltage.
5) Continue this procedure with all three phases on both sides of the switch.
If an intermediate reading is found, the phasing cannot be determined by this
method and the switch should not be closed until other means are used for phasing.
Voltage Measurements – Line-to-Ground
Keep the connecting cord free and clear while testing.
To use this two-stick voltmeter/phaser, first connect one of the probes to either
a ground or system neutral making sure the resistor stick is making contact at all
times during measurement. The other probe should be connected to the energized
source to be measured.
Maintain contact only long enough to read the meter. Always remove the probe
from the energized source first before removing the ground connection.

TEST POINT MEASUREMENTS

The DVM-80UVM includes a Test Point feature for measuring voltage from elbow test
points. To activate Test Point mode simply push the ON button again. Test Point mode
is indicated by a blinking decimal point. To turn Test Point mode off, simply push the ON
button once again and the decimal point will stop blinking. When using a voltmeter/phasing
set 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
approximate line voltage.
8
continued