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C9970
Users Guide
Theory of Operation
The Product uses electronics and a high-voltage mechanical design to indicate
the presence of dangerously-high ac and dc voltages. To do so, the Product first
determines the voltage difference between the body of the user and the object
under test. Then, the Product compares that difference to an internal safety
reference. If the voltage difference exceeds the safety reference, the Product
indicates danger. The user does not need to interpret readings.
The capacitance between the handle of the Product and the hand of the user is
part of the measuring circuit and may affect the sensitivity of the Product. When a
user works aloft near power transmission lines and is isolated from ground,
voltages can be induced onto the body of the user. The induced voltages may
cause the Product to indicate danger when no danger exists. The induced
voltages are harmless, but they must be discharged. See Aerial Tests.
Safety Gloves
The Product is designed to detect voltages ≥110 V, 60 Hz, ac. The use of gloves
reduces the sensitivity of the Product and may cause erroneous results. See
Theory of Operation.
If you wear gloves and the Product does not detect hazardous voltage, do a
second test without gloves and follow the results of the second test.
If you wear gloves and use the Product to do a test and the Product detects
hazardous voltage, do not retest without gloves. Move away from the test area
and refer to the safety procedures of your company.
Features of the Product
Figure 1 shows the features of the Product: a yellow, plastic, two-piece unit.
The front housing includes the carbide probe tip, two LEDs (one green and one
red), a check contact, a ground terminal, and a battery (not shown).
The rear housing, which acts as a handle, includes a set of concentric rings called
the flashguard, the on/off switch called the trigger, an instruction label, and a belt
clip.
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