29
Testing a Device with 2-Wire Power Supply Cord
1.
Connect the HT-S unit to a correctly rated source of supply and turn the power switch to the I or
ON position. Push the
RESET
button. The yellow
TEST
indicator should light, indicating that
the HT-S unit is ready to test.
2.
Turn the
Ground Check
switch on the rear panel to the Off position.
3.
Plug the 18 AWG GL Test Lead (Alligator Clip/Banana Plug ends, black) into the
RETURN
receptacle on the front panel of the HT-S unit, then, connect the alligator clip end to an exposed
metal part on the chassis of the equipment to be tested.
4.
Plug the power supply cord of the device being tested into the
Device
receptacle on the front panel
of the HT-S unit. See Figure8 for detailed connections.
Figure 8. Testing a Two Wire Power Cord Device
5.
Make sure the power switch on the device being tested is in the 1 or ON position.
Push the
TEST
button on the HT-S unit. The HT-S unit will:
5.1
Ramp the voltage at the rate set by the Ramp Time procedure.
o
If leakage current between the AC pins of the power supply cord and the chassis ground of
the unit rises above the value set by the Leakage Limit procedure, the red
Excess Leakage
LED will light, the buzzer will sound, and the test will terminate.
o
If the leakage current level is below the set level when the high voltage set by the High
Voltage Level procedure is reached, the green
Full Voltage
LED will light and the test will
continue.
5.2
Conduct the high voltage test for the amount of time set in the Test Duration procedure.
o
If a breakdown of the insulation system between primary voltage and ground is detected,
the red
Hipot Fail
LED will light, the buzzer will sound, and the test will terminate.
o
If no breakdown is detected, the high voltage will be bled off, the green
Hipot Pass
LED
will light, and the red
RESET
switch will light.
6.
For safety, the operator should not disconnect the cords until the
Hipot Pass
LED is lit and the
reading on the front panel voltage meter has dropped to zero. This will ensure that the test voltage
has been bled off.
7.
The operator can now remove the equipment from the HT-S unit and connect another. The HT-S
unit should then be armed by pressing the
RESET
button. When ready, the operator then presses
the
TEST
button and the test procedure will be conducted again.
