Applied Instruments Super Buddy Signal Level Meter Application Note page 2

Proof of Performance Testing with a Super Buddy™
Scanning
The menu option will start the Limit Scan screen. If limits are already defined for the presently
selected satellite, the scanning will start immediately.
Note: The Limit Scan is only useful if the LNB is being powered by the meter. Press the LNB
soft-key to power the LNB. On a multi-LNB setup, press the LNB soft key more than once to
toggle from LNB1 to LNB2 to LNB3, etc. The satellite orbital position (i.e. 110.0W) related to
each selected LNB port will be displayed in the top left corner of the LCD screen.
For each transponder to scan, the screen shows:
1) Tr – The transponder numbers to be scanned (transponders must be defined by user)
2) dBm – The received dBm signal level value corresponding to each specified transponder
3) Req - The required minimum IRD signal quality value Limit (must be defined by the user)
4) IRD – The received IRD signal quality value corresponding to each specified transponder
5) The Level Limit field (found at the very bottom center of the LCD screen) displays the
minimum desired Signal Level dBm value Limit (must be specified by user).
If a lock is not obtained, the IRD column will display "??" instead. The table will be filled in as the
transponders are measured in sequence. When all transponders are measured, the pass/fail
indication will appear.
The Limit Scan will continue running constantly until stopped by the user. You will receive a
PASS or FAIL message after each cycle of limit scanning has been completed. A PASS
message means that all of the received Signal Level (dBm) and IRD signal quality values were
greater than the minimum limits defined by the user for the specified transponders. A FAIL
message means that at least one of the received Signal Level (dBm) or IRD signal quality values
were less than the minimum limits specified by the user.
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