23
18.
Connect one end of the hookup wire to the
clip of the Test Return Lead and insert the
other end into one of the vertical parallel
slots in the High Voltage Device receptacle
on the front panel.
Keep clear of the wire
while the test is in progress
.
19.
Push the
RESET
button and then push the
TEST
button.
20.
The tester should conduct a test sequence,
terminated with a buzzer. At test
termination, the
Ground OK
,
Ground
Open
,
Excess Leakage
, and red
RESET
lamps should be lit.
21.
Note: Depending on the connection made
by the hookup wire in the Device
receptacle, the
Hipot Fail
Lamp may also
light.
Note: The following procedure
tests the "Hipot Breakdown"
circuit of the HT-2800 and involves
high voltage. Proceed with caution.
22.
Make sure the Test Return Lead is still
plugged into the Return jack on the front
panel.
23.
Make sure the Ground Check switch on the
rear panel is Off.
24.
Remove the hookup wire from the High
Voltage Test Receptacle, but leave it
connected to the clip of the Test Return
Lead. Carefully hold the Test Return Lead
by the insulated clip boot.
25.
Push the red
RESET
button, then the
yellow
TEST
button. After the
Full
Voltage
LED lights, and before the
Hipot
Pass
LED has lit, insert the other end of
the hookup wire into one of the vertical
parallel slots in the High Voltage Device
receptacle on the front panel.
26.
The test should immediately terminate with
a buzzer. The
Ground OK
,
Ground Open
,
Full Voltage
,
Hipot Fail
and red
RESET
lamps should be lit.
Note: Depending on how the connection
between the High Voltage Test Receptacle
and the hookup wire is made, the
Excess
Leakage
LED may light, and in some
instances the
Ground OK
LED may
extinguish.
If the results of the performance test are not in
accordance with the above, service is required.
Remove the Tester from service and contact the
manufacturer for servicing information. If the
results of the tests above are correct, proceed
with the Calibration Procedure.
Calibration Procedure
The Calibration Procedure should be performed
annually and any time the instrument has been
repaired. The calibration procedure consists of
two parts:
?
The Voltage Calibration adjustment
calibrates the meter reading to agree with
the voltage output.
?
The Continuity Calibration adjustment sets
the pass/fail point for the continuity check.
Before starting the Calibration procedure, perform
the Calibration access procedure given earlier in
this Section.
NOTE
Allow the instrument to stabilize for
approximately five minutes. Perform all
calibration adjustments at an ambient
temperature of 23
?
C
?
5
?
C (73
?
F
?
9
?
F).
WARNING:
Calibration Adjustments Are
Performed On Live Circuits. Exercise
Caution At All Times, And Use A Non-
Conductive Tool For All Adjustments.
Voltage Calibration Adjustment
Use the following procedure to calibrate the
output voltage. Pot R326 is located on the lower
PWB, and is accessible through a hole in the top
board next to R210.
1.
Ensure that all test leads are removed from
the HT-2800.
2.
Turn the
Ground Check
switch on the rear
test panel Off.
3.
Reset the
Test Time
control on the Rear
Panel to approximately 50% of its range.
4.
Connect the red lead of the DMM to one
of the vertical slots of the
DEVICE
receptacle, and the black lead of the DMM
to the
RETURN
receptacle. Use a range
suitable for reading 2800 volts DC.