Instructions

Operator’s Manual
31
Common Mode Gain). Record the result to two-digit resolution (xx,000 : 1) in the Test
Record.
10. Verify that the Common Mode Rejection Ratio at 70 Hz is greater than 3,160:1 (70
dB).
11. Set the oscilloscope to display Channel 2. Change the horizontal scale factor to 0.5
s/division. Set the BWL on channels 1 and 2 to 200 MHz.
12. Change the frequency of the Function Generator to 1 MHz.
13. Adjust the trigger level as necessary for a stable display. Adjust the Function
Generator amplitude as needed to maintain 8.0V pk-pk as measured on Channel 2.
14. Turn off the oscilloscope Channel 2 display; turn on the display of Channel 1 and
Math waveform A (averaged Channel 1). Adjust the scale factor of Channel 1 and the
Zoom of Math A as necessary to accurately measure the amplitude of the averaged
waveform.
15. Record the displayed Common Mode Signal at 1 MHz to two-digit resolution in the
Test Record.
16. Calculate the Common Mode Rejection Ratio (CMRR) at 1 MHz by dividing 8,000 mV
by the measured Common Mode Signal recorded in step 15. Record the result in the
Test Record.
17. Verify that the Common Mode Rejection Ratio at 1 MHz is greater than 1,000:1 (60
dB).
18. Remove all cables and test fixtures from the AP033 probe.
This concludes the Performance Verification of the AP033. Complete and file the results
recorded in the AP033 Performance Verification Test Record as required by your quality
procedures. Apply a suitable calibration label to the AP033 housing as required.