Ac Hazardous Voltage Testing - Fluke C9970 User Manual

C9970 Voltage Detector
Users Guide

AC Hazardous Voltage Testing

No grounding is required except when testing aloft near power transmission
lines (see "Aerial Testing" on page 14).
For AC measurements, do not make contact between the metal
probe tip and exposed bare wire.
The Voltage Detector is designed to detect 60 Hz, AC hazards. At frequencies
below 60 Hz, the Voltage Detector requires higher voltages to trigger a
hazard indication. At frequencies higher than 60 Hz, the Voltage Detector
requires less voltage to trigger.
To test for hazardous AC voltage, do the following:
Perform a self check (see "Self Check" on page 8).
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Do not connect the ground lead to the Voltage Detector.
Press and hold down the trigger while approaching the object to be
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tested. The tip must be the closest point to the object under test. If the
red LED flashes, immediately move away from the object. A high voltage
is present and you should not continue the test.
When high voltages are present and a hazard indication
appears, move away immediately.
If no hazard indication appears while approaching the object, press the
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probe tip against the object. It may be necessary to turn the Voltage
Detector from side to side to break through paint or other surface
finishes or corrosion. Ensure that a reliable contact is made.
To avoid false indications due to static electrical discharge, release and
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repress the trigger while still making contact with the object. Ensure that
a reliable contact is maintained.
Still holding the trigger down, remove the Voltage Detector from the
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object and observe the LEDs:

The green LED means a safe condition.

The red flashing LED means dangerous voltages are present.
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W X
Warning
Note
W
Caution