Agilent Technologies N4962A Guia do Utilizador descarregar pdf (Página 84)

Remote GPIB Interface

Serial BERT 12.5 Gb/s User Guide

After running for 5 seconds, the program outputs a string with TOTAL-BITS,

TOTAL-ERRORS, ELAPSED-SECONDS, BIT-ERROR-RATE.

An alternative method of measuring BER is to use the sample command. The

SAMPLE command allows the user to "sample" the Bit Error Rate any number

of times during a measurement period.

590 OUTPUT 725; ":SENSE:SWEEP:TIME 10" ! set up a 10s BER measurement

600 OUTPUT 725; ":TRIGGER:INITIATE" ! start the 10s measurement

610 WAIT 2 ! wait 2 seconds

610 OUTPUT 725; ":TRIGGER:SAMPLE" ! trigger BER sample

620 OUTPUT 725; ":SENSE:DATA?" ! query a sample of the BER data

630 ENTER 725; result$ ! read the result

640 PRINT result$ ! print the BER sample result

650 WAIT 3 ! wait 3 seconds

660 OUTPUT 725; ":TRIGGER:ABORT" ! cancel the measurement

670 OUTPUT 725; ":FETCH:BER?" ! query the final BER data

680 ENTER 725; result$ ! read the result

690 PRINT result$ ! print the BER sample result

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Agilent Technologies N4962A Guia do Utilizador Página 84