Compliance West HT-2000PR, Instruction Manual

Page: 9 / 41

3
Figure 1. Test points of three-wire device.
In some cases the device under test is not necessary an electronic device, it could be any tool that
can be in contact with a source of electric power, for example an ordinary screwdriver, in this
case the only test that we can perform is the insulation between the handle and the metal of
contact (Defeating the ground connection test) to ensure the proper isolation of the handle.
Safety Precautions
The dielectric withstand test generates voltages of up to 2000 Volts AC (HT-2000PR & HT-
3000PR) or 2800 Volts DC (HT-2800PR & HT-3000PR) at potentially lethal current levels.
Currents of as little as 5 mA at 120V can cause death, and the HT-PR is capable of generating
20mA AC at up to 2000 Volts, and 5mA DC at up to 2800 Volts. The HT-PR has been designed
to minimize exposure to high voltages. However, the potential for serious injury or death exists
and personnel should be aware when they conduct this test.
Test Personnel
Personnel require special training to conduct the dielectric withstand test. They should
understand electrical fundamentals clearly, and be aware that high voltage is adept and creative
at completing a path to ground. Instructions should include a warning against any metal jewelry.
Operators should not allow others in the testing area, especially when tests are being conducted.
Organization is to be stressed. The operator should keep the area free of unused leads and
equipment.
Testing Area
The area used for conducting the dielectric withstand test should be as remote as possible from
normal production line activities. Only personnel actually conducting the test should be allowed
in the area, and it should be taped or roped off to preclude casual entry by other employees. In
addition, the area should be marked "WARNING - HIGH VOLTAGE TESTING" or the
equivalent to warn others of the nature of the testing taking place.
The bench being used should be non-conductive, and any exposed metal parts should be tied
together and grounded. If a conductive surface must be used, it should be grounded.
Because of sparking during a dielectric test failure, it is not safe to conduct dielectric withstand
tests in combustible atmospheres.