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8
Baker Instrument Company
The Measure of Quality
9.
If a 6kV or 12kV model was manufactured after August 1998 and is enclosed in a tan
Rittal design case locate six (6) gray hinge covers on the top cover. With a small
slotted screw3driver pry the covers so that six (6) Phillips screws that secure the top
cover are visible. Remove all six (6) screws to remove the top cover.
10.
Locate the card cage that houses the Power and Signal Boards.
11.
Remove the top cover of the card cage. It is secured by eight (8) M4 x 7mm black
hex head screws and two (2) M4 kep nuts. Remove this hardware. Position one hand
inside the card cage and lift up at the back end to remove the top cover.
12.
Locate on the Motherboard an insulated jumper wire J7 that is positioned between
connectors J2 and J3. If you intention is to run the tester without a supplied ground
permanently, set step 14.
13.
If your intentions is to move the tester between environments that do and do not have
a supplied ground, see step 15.
14.
Remove jumper at J7.
15.
Remove jumper at J7. Install two 22 gauge wires one at each connector hole at J7
and exit these wires from the right side of the card cage. The length of these wires
should be long enough to reach the front panel. Tie wrap and secure these wires
along the right side of the card cage. Obtain a two-position toggle switch that has a
common/ NO and NC contacts. Drill a hole between the leads energized light and the
right side of the card cage and mount this toggle switch to the front panel
16.
Solder the wires from the J7 connector to the toggle switch. This will now enable
you to more easily disable the open ground fault detection circuit.
Note: The Open Ground LED will still be lit when the tester does not sense a ground
connection, but now the tester will operate.
H
IPOT
T
RIP FAULT INDICATOR LAMP LIT
1.
Check that the winding under test is not indeed shorted.
2.
Check for a shorted high voltage transformer secondary to ground. Measure with a
multimeter from D3 anode on the Stack board to ground. Normal measurements are
approximately 12K ohms with the function switch in either the 10 or 100
µ
A position
or approximately 20K ohms in the 1
µ
A position. If found to be much lower
resistance, replace T1 high voltage transformer.
3.
Check for shorted SCR’s on the Stack board by measuring the resistance across all
cathode/anode junctions of each SCR. These measurements can be obtained easily by