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D. Adjust OFFSET (R330)
AP034-OM-E Rev D
R7
LF CMRR
Figure 12. Probe Tip Adjustment Locations
12. Remove the BNC cable from the output of the Function
Generator and the calibration fixture. Leave the BNC cable
from the SYNC output to the oscilloscope external trigger
input in place.
1. Reconnect the BNC cable to both ends of the ProBus
extension cable. The oscilloscope end of the extension
cable should still be connected to channel 1.
2. Set the oscilloscope channel 1 scale factor to 10 mV/div,
and the acquisition mode to Auto. Set the BWL to 20 or
25 MHz. Adjust the OFFSET to 0.0 mV
3. Carefully move the AP034 probe tip from the Common
Mode Drive No Termination position of the AP033/AP034
Calibration
Fixture
Termination position. Press the probe into the fixture to
fully engage the pins.
4. Connect female BNC-to-dual male banana plug adapters to
each end of the BNC cable. Plug one end into the output of
the DC voltage source, making sure the plug corresponding
to the BNC shield (marked "Ground") is connected to the
voltage source –Output (or common for dual supplies)
connector, and the other pin on the +Output connector.
ISSUED: January 2000
$GMXVWPHQW 3URFHGXUH
Attenuator CMRR
Attenuator Comp
to
the
Differential
C18A
C17A
Drive
No
²
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