AWA Troubleshooting
Open Condition Display
Note the figure below. Is the display you are
seeing like this?
If yes, the unit may have at least one broken test
lead causing the Open condition. The test lead
that corresponds to the TLS position that produces
this type of wave pattern is the lead, which is
broken. Verify this by pulling on the boot/clip
assembly of the lead. A broken test lead will
stretch. If it doesn’t repeat this procedure at one-foot intervals for the length of the lead.
If the leads of the tester are good, check the continuity of the winding under test.
Hipot Display Checks
The Hipot display shows only the VOLTAGE or CURRENT bar. One of three
problems might exist.
• The item being tested is in fact faulty and has either low insulation resistance or open
connections.
• The tester has an internal problem.
• The tester has a test lead problem as shown above for an Open Condition.
Disconnect the test leads from the motor and isolate the tester from any grounded surface.
Reduce the Output to minimum and attempt a Hipot test with an open lead condition.
Your display should indicate a rising voltage bar. The current bar may rise slightly but
fall back to zero when the output increase is stopped. Do not exceed 10% rotation of
the Output control! There is no need to perform this test at high voltage.
If the display still shows NO voltage bar call Baker Instrument Company Service
Department. Use a meter to confirm the insulation resistance of the device being tested.
Current bar operation can be tested by shorting test lead #1 and the ground lead together.
Under this condition, the voltage bar will NOT move off the zero line and the current bar
should rise very rapidly and activate the Hipot Overcurrent Trip warning light (Hipot
Trip). If the Hipot Trip light does not light, check for open test leads at either test lead
#1 or the ground lead (see Open Condition Display). If the problem persists, contact
Baker Instrument Company Service Department.
Hipot Trip Check
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