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It is imperative that a good ground be provided to the HT-2800. Before connecting the HT-2800,
ensure that a low-resistance gro und is provided by the building wiring. If the HT-2800 is used on a high-
resistance grounding circuit, dangerous high voltages may be present to the operator. In addition, the
power to the Testing Area should be provided with an easily reached shutoff switch which can be actuated
by personnel outside the Area if needed.
Safety Techniques
The high voltage circuit of the HT-2800 can be shut off at any time by pressing the
RESET
button.
The HT-2800 has been provided with a Reset switch to provide an unarmed "Standby" setting
when it is energized, but idle. When the red
RESET
button is lit. the tester will not provide high voltage
until the
RESET
Button and the
TEST
Button have been pressed in order. To prevent inadvertent
operation, the operator should b e instructed not to press the
RESET
Button until the test is ready.
The HT-2800 is equipped with a Ground Continuity Check which will not allow high voltage to be
applied if the Test Return Lead is not properly connected. This is an important safety feature and should
not be defeated unless two wire products are being tested. In that event, it is imperative that the operator
make absolutely sure the Test Return Lead is properly connected to the equipment being tested. If the lead
is not properly connected, a dielectric withstand test failure may energize exposed dead metal of the
equipment being tested. Additionally, the HT-2800 may not recognize the failure. The test will continue for
its normal length of time, and the HT-2800 may show a "PASS".
The HT-2800 has been designed for one-touch operation with the right hand. If possible, it should
be set up to the left and in front of the equipment under test. The equipment under test should be
connected to the HT-2800 and then left alone by the operator. After the operator is clear of the Tester and
the equipment under test, he should press the
RESET
Button, then the
TEST
Button, with his right hand.
This will allow the greatest separation between the operator and the test being conducted.
The HT-2800 is designed to bleed the high voltage away after the test has concluded. In order to
ensure that any voltage present in the equipment being tested has been completely bled away, the operator
should not unplug the equipment under test from the HT-2800 until the front panel meter reads zero volts.
Using the HT-2800 Dielectric Withstand Tester
The dielectric withstand test involves high voltage and caution should be exercised when using
the Tester. The Tester's return lead is connected to ground potential and when properly connected to the
equipment being tested, it will guard against the operator contacting high voltage. Always make sure the
return lead is firmly connected to exposed dead metal. In the sections below, the three tests are discussed.
Continuity Check
The continuity check ensures that the grounding pin of the power supply cord is properly
connected to the exposed dead metal of the chassis. If this connection is absent, the exposed dead metal of
your product could be at line potential indefinitely after an internal wiring fault, causing risk of shock to
anyone touching it.
If the green
Ground OK
LED lights and the test continues, the connection between the grounding
pin and the exposed dead metal of the equipment being tested has a res istance of below three ohms*.
Ground Check Failures
If the red
Ground Open
LED lights, the buzzer sounds, and the test is terminated. The connection
between the grounding pin of the attachment plug cap and the exposed dead metal of the chassis has a
resistance of greater than three ohms*. This indicates a problem with the connection of the HT-2800 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