Agilent Technologies N4962A Uživatelská příručka stáhnout pdf (Strana 83)

Serial BERT 12.5 Gb/s User Guide

The N4962A has a programmable error injection that can be set from

1error/sec to 1E7 errors/sec in logarithmic steps of 10. This is detailed in Table

14.

430 OUTPUT 725; ":SOURCE:PRBS:IERR:RATE ERR1E3" ! set err inject rate=1E3/sec

430 OUTPUT 725; ":SOURCE:PRBS:IERR:RATE OFF" ! turn error injection OFF

440 OUTPUT 725; ":SOURCE:PRBS:IERR:RATE?" ! query the result

450 ENTER 725; result$ ! read the result

460 PRINT result$ ! print the query result

The next block of code shows how to set up a timed Bit Error Measurement of

5 seconds and report the BER at the end of the measurement interval.

470 OUTPUT 725; ":SENSE:SWEEP:TIME 5" ! set up a 5 second BER measurement

480 OUTPUT 725; ":SENSE:SWEEP:TIME?" ! query the measurement time

490 ENTER 725; result$ ! read the result

500 PRINT result$ ! print the query result

510 OUTPUT 725; ":TRIGGER:INITIATE" ! start the 5 sec measurement

520 PRINT "Starting 5s measurement" ! display

530 OUTPUT 725; ":STATUS:OPERATION:MEASUREMENT:CONDITION?" ! check if done

540 ENTER 725; result$ ! read the result

550 PRINT result$ ! print the query result

560 OUTPUT 725; ":FETCH:BER?" ! query BER statistics

570 ENTER 725; result$ ! read the result

580 PRINT result$ ! print the query result

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Agilent Technologies N4962A Uživatelská příručka Strana 83