Compliance West HT-2000PR, Instruction Manual

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6
To perform the ground connection check test, follow the next steps.
1. Identify the Ground resistance limit of your device (Refer to your Device standard for
the resistance limit setting).
2. Modify if necessary the Ground resistance setting (see Adjustments).
3. Get your Test leads Resistance (see Ground offset in Adjustments section).
4. Connect the Device under test (see Connections section for examples).
5. Run the Dielectric Withstand Test.
Note : the HT-PR always measures the Total resistance connected to the return and Chassis
connector, the open ground point will be:
R open = R2 + R setting
Where R2 is the total resistance of the test leads, if the Ground connection resistance of the
device under test is equal or greater than the value of the resistance setting the R open point will
be reached.
If the green
Ground OK LED light is on, the connection between the grounding pin and the
exposed dead metal of the equipment being tested has a resistance lower than the indicated on
the setting.
Ground Check Failures
If the red Ground Open LED light is on, the buzzer sounds, and the test is terminated. The
connection between the grounding pin and the exposed dead metal of the chassis has a resistance
higher than the indicated in the ground setting. This indicates a problem with the connection of
the HT-PR to the equipment being tested, or that the ground connection in the equipment being
tested is defective. The connection to the tester should be checked by removing the Test Return
Lead clip from the equipment under test and reconnecting it, taking care to make a good
connection. The unit should then be retested. If a failing result is repeated, the connection
between the power supply cord ground pin and the chassis of the equipment being tested should
be checked and reworked until a passing result is obtained.
Defeating the Ground Check
The Ground check can only be conducted on equipment using a three wire grounded power
supply cord. Some equipment, such as most portable lamps and all double insulated tools, have
only a two wire power supply cord, so the Ground test cannot be conducted.
Please note that defeating the Ground check should not be done except when necessary to
test two-wire devices. The Ground check feature provides an extra level of operator safety
because high voltage will not be applied if the Test Return Lead is not properly connected
to the exposed dead metal of the equipment being tested. If the Test Return Lead is not
properly connected, a dielectric withstand failure may energize exposed dead metal.