10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110
5-3
MAINTENANCE
NOTE:
Heat from the charging circuit causes the UUT to
drift. The COOL DOWN period is only necessary if the UUT
has been charging for an extended period of time.
6.
Turn the voltmeter on allowing a 10 minute warm up.
a)
Set unit to measure DC voltage.
b)
Set unit to Auto range.
7.
Connect clip leads to the voltmeter.
B.
AC Circuitry Check
1.
Set the range switch to 20
Ω on the UUT
.
2.
Connect the voltmeter to the UUT;
a)
Voltmeter Red test lead to TP1 of the UUT,
b)
Voltmeter Black test lead to TP2 of the UUT.
3.
Plug the UUT into AC and turn on.
4.
Verify the reading on the voltmeter reads between
1.0 to 1.5 VDC.
5.
Disconnect the UUT from the AC source.
6.
Disconnect the Voltmeter from the UUT.
NOTE:
The UUT is to be unplugged from AC during the
remaining portions of the procedure.
C.
Zero the Display
1.
Set the range switch to 2 m
Ω on the UUT
.
2.
Short out all four terminals of the UUT in the following
order, +I to –I, –I to +E, +E to –E using the three
pieces of buss wire.
3.
Adjust R143 for a zero reading ±1 count on the least
significant digit as displayed by the UUT.
4.
Set the range switch to the next higher range.
5.
Verify a zero reading within ±1 count on the least
significant digit.
6.
Repeat steps 4 and 5 for all remaining ranges.
7.
Disconnect the buss wires from the UUT.
D.
2 m
Ω Adjust
(Main Gain Adjust)
1.
Set the range switch to 2 m
Ω
on the UUT.
