Adjust Fine Dc Balance (R304) - LeCroy AP034 Instruction Manual

B. Adjust Fine DC Balance (R304)
²
R226 R322C
Coarse DC Bal Gain
Figure 10. Amplifier Board Adjustment Locations
1. Remove the shorting plug from the Logic Board.
2. Reinsert the shorting plug into the two holes near the end
of the Logic Board. (Figure 9.)
3. Reenter Cal Mode by pushing either of the two buttons that
protrude through holes in the Logic Board.
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connected to the DMM.
5. Short the output BNC connector by reconnecting the cable
to the SHORT connector on the AP033/AP034 Calibration
Fixture. The SHORT connector is the only BNC connector
on the AP033/AP034 Calibration Fixture that does not have
corresponding input pins for the probe tip. It is located on
the end of the board beyond the Common Mode
Terminated connector.
6. In Cal Mode, the EFFECTIVE GAIN indicators serve as an
adjustment indicator. The EFFECTIVE GAIN indicators are
located on the Logic Board (Figure 11). It may be
necessary to hold the boards in your hands to see the
indicators while making the adjustment.
ISSUED: January 2000
$3 $FWLYH 3UREH
R330 R304
Offset Fine DC Bal
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AP034-OM-E Rev D