Appendix A: Alternate Verification Procedures
42
P6248 1.7 GHz Differential Probe Service Manual
18-inch BNC cable
Spectrum analyzer
1103
CH 1
input
CH 1
output
18-inch BNC cable
P6248
BNC-to-probe-tip adapter
Frequency synthesizer
CM pair for
CMRR test
Figure 19: Setup for the CMRR tests
3.
Set the probe to
÷
1 attenuation.
4.
Change the spectrum analyzer reference level to --20 dBm.
5.
Record the level displayed on the spectrum analyzer (be sure to factor in the
change in reference level, 30 dBm). It may be necessary to use the video
filter to lower the noise floor. Verify that the change in the level (relative to
the level recorded in step 1f above) is less than or equal to the
÷
1 measured
feed through column of Table 9 on page 43.
6.
Set the probe to
÷
10 attenuation.
7.
Record the level displayed on the spectrum analyzer. Verify that the change
in the level (relative to the level recorded in step 1f above) is less than or
equal to the
÷
10 measured feed through column of Table 9 on page 43.
(These values are 20 dB lower than the specification to account for the
÷
10
attenuation. )
8.
Set the synthesizer to 100 MHz and 0 dBm.
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