Adjust Final Attenuator Cmrr (C18A) - LeCroy AP034 Instruction Manual

G. Adjust Final Attenuator CMRR (C18A)
AP034-OM-E Rev D
Fixture to the probe tip. Press the probe into the fixture to
fully engage the pins.
5. Set the oscilloscope display to channel 1, vertical scale
factor to 50 mV/div and the horizontal scale to 1 µs/div.
Set the trigger source to channel 1, and Slope to Positive.
Adjust the oscilloscope trigger level as necessary for a
stable display.
6. Using the OFFSET control, move the trace down until the
top portion of the waveform is centered.
7. Using the 0.25 in. square adjustment tool, adjust
Attenuator Comp (C17A) for a flat top waveform. (See
Figure 12 for adjustment location.)
8. Remove the cable from the CAL output connector on the
scope.
1. Carefully move the AP033 probe head from the Differential
Drive 50 ohm Termination portion of the AP033/AP034
Calibration Fixture to the Common Mode Drive 50 ohm
Termination portion.
2. Remove the BNC cable from the Differential Drive 50
ohm Termination
Calibration Fixture. Connect one end of the BNC cable to
the Common Mode Drive 50 ohm Termination connector
of the AP033/AP034 Calibration fixture. Connect the other
end of the cable to the female end of a BNC Tee adapter.
Plug the male connector of the BNC Tee adapter into the
channel 4 input of the oscilloscope. Connect a second BNC
cable to the remaining female connector of the BNC Tee
adapter. Connect the other end of the second BNC cable to
the CAL output BNC connector.
3. Set the oscilloscope display to channel 4, coupling to
'&0 , vertical scale factor to 200 mV/div, and the trigger
source to channel 4. Adjust the oscilloscope trigger level as
necessary for a stable display.
4. Set the oscilloscope to display channel 1, and vertical scale
factor to 10 mV/div. Set the OFFSET to 0.0 mV
ISSUED: January 2000
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connector of the AP033/AP034
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