Teledyne LeCroy AP034 - Manual (Page 49)

Operator’s Manual
922261-00 Rev A 43
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.
E. Adjust GAIN (R322C)
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 190mV on the DMM.
6. Record the DMM reading. Be careful not to alter the output amplitude of the generator
after the measured value has been recorded
7. Remove the banana plug adapter and connect the free end of the cable to the Differential
Drive no Termination connector on the calibration fixture.
8. Connect the AP034 Output cable with 50Ω

Precision termination to the DMM.
9. Using a low capacitance screwdriver, adjust GAIN (R322C) so that the DMM reading is
within ±1 mV (0.5%) of the reading recorded in step E-6. (See Figure 9 for adjustment
location.)
10. Disconnect the Function Generator, DMM, calibration fixture, and precision 50
Ω 
terminator.