Teledyne LeCroy AP033 - Manual (Page 49)

Operator’s Manual
922260-00 Rev A 43
weighting, of channel 3. Turn off the trace 3 display. Use the Math Zoom and Position controls
as necessary to view the waveform.
12. Adjust ÷
13. 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.
Remove the BNC cable and 50Ω terminator from channel 3.
E. Adjust OFFSET (R330)
1. In the oscilloscope channel 1 “COUPLING” menu, set AP033 Atten/Gain to Manual, Probe Atten
to /1 and Probe Gain to X1. Set the channel 1 scale factor to 2 mV/div, and the acquisition
mode to Auto. Set the BWL to 20 or 25 MHz. Adjust the OFFSET to 0.0 mV.
2. Carefully move the AP033 probe tip from the Common Mode Drive No Termination position of
the AP033/AP034 Calibration Fixture to the Differential Drive No Termination position. Press
the probe into the fixture to fully engage the pins.
3. Attach the 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 that 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.
4. Connect the other end of the cable to the DMM input, making sure that the plug corresponding
to the BNC shield (marked “Ground”) is connected to the LO or COM input.
5. Set the DC Voltage Source to read as close as possible to +0.4000 V on the DMM.
6. Autobalance the AP033 by pressing the AUTOBALANCE button twice, or by pressing and
holding both probe offset buttons for at least two seconds.
7. Disconnect the BNC cable from the female BNC-to-dual male banana plug adapter on the
DMM.
8. Reconnect the BNC cable from the DC Voltage Source to the Differential Drive No Termination
connector on the AP033/AP034 Calibration Fixture.
9. Set the probe offset to –0.4000 V by rotating the OFFSET knob in the CHANNEL section of the
oscilloscope (or with the OFFSET knob linked to the “COUPLING” menu when using the older
software.)
10. Allow 10 seconds for the AP033 to stabilize.
11. Adjust Offset (R330) to bring the trace back to exactly center screen. (See Figure 11.)
12. Remove the dual banana plug adapter from the output of the DC voltage source and reconnect
it, with the pins reversed. (The plug corresponding to the BNC shield (marked “Ground”) should
now be connected to the + Output connector.)