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© Sage Instruments 2000
9100-2930-02 01/31/00
5-42
Section V Option Menu Numbers
Option Menu #:
13
The 930i begins measuring phase and amplitude jitter over the filter bandwidth of 20 Hz to 300 Hz and
displays the level and frequency of the received holding tone (usually 1020 Hz).
If you receive an invalid tone, you should press the Option Menu key to stop testing and return to the
main display to check your setup and connections. If a tone is valid, the display will show the
measurements.
6. Press K4 under
20-300 Hz
to change the filter bandwidth selection from
20–300 Hz
to
4–300
Hz
.
for example:
5.9° 3.2% 1020Hz -16.0dBm 4-300Hz
K1
K2
K3
K4
If the readings are relatively the same in the 20-300Hz test and the 4-300Hz test, then the source of the
excess jitter probably has a fundamental frequency above 20 Hz because there are no significant
contributions to the levels from below 20 Hz.
Between 20 Hz and 300 Hz the most significant source of jitter is the 60 Hz AC power line frequency
and its 2nd through 5th harmonics (120 Hz, 180 Hz, 240 Hz, 300 Hz).
7. Press the Option Menu function key to exit this function.
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Summary of Contents for 930i
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