Tektronix 2715, User Manual

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CATV Measurements
5–58
2715 User Manual
10. Turn on the carrier and press [W] to continue (or [Z] to abort) the measure-
ment.
The instrument searches the single-sweep record for beats within
±
50 kHz of
offset locations specified in the test table and displays the worst case result.
To run the CSO measurement in Continuous mode, follow these steps:
NOTE . Continuous mode is not available if the in-service CSO measurement
basis is selected.
1. Press [5] [4] to select the Continuous mode.
The SET UP TEST FREQUENCIES AND CONTINUOUS MODE
PARAMETERS menu (item 5) is added to the menu.
2. Press [5] and enter the SET UP TEST FREQUENCY menu.
3. Press [0] and enter the first beat frequency as an offset from the visual
carrier.
4. Press [1] and enter the second beat frequency.
5. Press [2] and enter the third beat frequency.
6. Press [3] and enter the fourth beat frequency.
7. Press [4] and enter the fifth beat frequency.
8. Press [5] to use default frequencies.
9. Press [6] to specify the frequency of the carrier to be measured. This is
usually the next channel down (in frequency).
10. Press [7] to enter the test interval. Minimum interval (and default) is 15
seconds. The maximum test interval is 21600 seconds (6 hours).
11. Press [8] to enter how often the instrument normalization will be run.
Minimum interval (and default) is 1 hour and the maximum interval is 24
hours.
12. Press [BKSP] [BKSP] [0] to run the measurement.
The instrument normalizes itself for about 12 minutes. It then measures the
specified carrier frequency within 200 kHz on either side for a peak to use as
an amplitude reference. Next it measures the amplitudes of the beats within
50 kHz on either side of the specified beat frequencies. It then waits for the
interval to expire so the cycle can be repeated.