Tektronix WFM700 Series, Service Manual

Page: 75 / 194

Performance Verification
WFM700 Series Waveform Monitors Service Manual
2- 43
13. Calculate the percentage of frequency error using the formula:
Frequency Error LF2 frequency
100
14. CHECK that the calculated frequency error is between –10% and +10%.
15.
Set the
Clock BW
to
10 Hz
.
16. Adjust RF generator settings as follows:
LFGEN2 Frequency 10 Hz
17. Adjust the RF generator LF2 frequency in 0.1 Hz steps until the displayed
waveform shows exactly 1 UI phase modulation. See Figure 2--13 on
page 2--37. Note the LFGEN2 frequency setting.
18. Calculate the percentage of frequency error using the formula:
Frequency Error
10
Æ LF2 frequency
10 É
19. CHECK that the calculated frequency error is between –10% and +10%.
20. Set Clock BW to 1 kHz .
21.
Adjust the RF generator settings as follows:
LFGEN2 Frequency 1 kHz
22.
Adjust the RF generator LF2 frequency in 10 Hz steps until the displayed
waveform shows exactly 1 UI phase modulation. See Figure 2--13 on
page 2--37. Note the LFGEN2 frequency setting.
23. Calculate percent frequency error using the formula:
Frequency Error
0.1
Æ
LF2 frequency
1000 É
24.
CHECK that the calculated frequency error is between –10% and +10%.
25. Press the WFM button to exit Eye mode.