Teledyne LeCroy AP033 - Manual (Page 35)

Operator’s Manual
922260-00 Rev A 29
18. After the DMM reading has stabilized, record the measured output amplitude to 100 μV
resolution in the Test Record.
19. Divide the measured output voltage recorded in step A-18 by the sine wave generator output
voltage (probe input voltage) from step A-7. Subtract 1.0 from the ratio and multiply the
result by 100 to get the error in percent.
20. Record the answer to two significant places (±x.xx%) on line A-20 in the Test Record.
21. Verify that the X10 gain error is less than ±2%.
22. Divide the Sine Wave Generator output voltage recorded in step A-7 by 10. Record the result
as “Expected Probe Output Voltage” in the Test Record.
23. Return the Probe Gain to X1. Leave the Probe Atten set to /10.
24. After the DMM reading has stabilized, record the measured output amplitude to 10 μV
resolution in the Test Record.
25. Calculate the error by dividing the measured output voltage recorded in step A-22. Subtract 1.0
from this ratio and multiply by 100 to get the error in percent.
26. Record the calculated error to two decimal places (±x.xx%) as ÷10 Gain Error’ in the Test
Record.
27. Verify that the ÷10 gain error is less than ±2%.
28. Disconnect both BNC cables from the test setup.
B. Check High Frequency Common Mode Rejection Ratio (CMRR)
NOTE: Common Mode Rejection Ratio (CMRR) is defined as the Differential Mode Gain divided by
the Common Mode Gain (normalized inverse of the Common Mode response). At higher
frequencies where the bandwidth of the amplifier begins to attenuate the differential mode signal,
both the differential mode gain and common mode gain must be measured to derive the CMRR.
1. Disconnect the ProBus Extension cable from the AP033 and the oscilloscope. Reconnect the
AP033 directly to the Channel 1 input of the oscilloscope.