Adjust Gain (R322C) - LeCroy AP034 Instruction Manual

E. Adjust GAIN (R322C)
AP034-OM-E Rev D
18. Again, 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 – or
Common Output connector.
19. In the CHANNEL menu of the oscilloscope, set the probe
offset to –1.600 V by rotating the OFFSET knob.
20. Allow 10 seconds for the AP034 to stabilize.
21. The trace should be offset from the center line by the same
amplitude but opposite polarity of the value noted in step
E-16.
22. Repeat steps E-13 through E-21 as necessary until the
errors at +1.6 V and at –1.6 V are approximately equal, and
both are within 10 mV of the center scale. Reverse the
polarity of the dual banana plug adapter at the output of the
DC voltage source, and the corresponding probe offset
value with each repetition.
23. Disconnect the cable from the DC Voltage Source. Keep
the AP033/AP034 Calibration Fixture connected to the
AP034 for the next step.
1. Set the AP034 offset to 0.000 V by rotating the OFFSET
knob in the CHANNEL section of the oscilloscope.
2. Disconnect the BNC cable from the oscilloscope end of the
ProBus extension cable. Reconnect this end of the cable to
the precision 50 Ω termination.
3. Connect one end of a second BNC cable to the output of
the Function Generator. Connect the BNC-to-dual male
banana plug adapter to free the end of the BNC cable.
Insert the banana plugs of the adapter into the input
terminals of the Digital Multimeter (DMM).
4. Set the DMM to measure AC volts.
5. Set the mode of the Function Generator to Sine Wave, the
frequency to approximately 1 kHz and the output amplitude
to read approximately 190 mV on the DMM.
ISSUED: January 2000
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