Agilent Technologies N4962A Podręcznik Użytkownika Pobierz pdf (Strona 82)

Remote GPIB Interface

Serial BERT 12.5 Gb/s User Guide

This block of code shows how to change system configuration settings, such

as the PRBS pattern length, PRBS mark space density, internal clock power,

and jitter injection mode.

210 OUTPUT 725; ":SOURCE:PATTERN PRBS31" ! set the PRBS pattern to 2^31-1

220 OUTPUT 725; ":SOURCE:PATTERN?" ! query the value of the pattern

230 ENTER 725; pattern$ ! read the result

240 PRINT pattern$ ! print the pattern value

250 OUTPUT 725; ":SOURCE:ROSC:SOURCE EXT" ! use an external source as clock

260 OUTPUT 725; ":SOURCE:ROSC:SOURCE INT" ! use the internal 10GHz source

270 OUTPUT 725; ":SOURCE:ROSC:SOURCE?" ! query the current source setting

280 ENTER 725; source$ ! read the result

290 PRINT source$ ! print the source value

300 OUTPUT 725; ":SOURCE:ROSC:JITT ON" ! turn jitter injection on

310 OUTPUT 725; ":SOURCE:ROSC:JITT?" ! query the jitter injection mode

320 ENTER 725; jit$ ! read the result

330 PRINT jit$ ! print the jitter mode

340 OUTPUT 725; ":SOURCE:PRBS:MARK MS8" ! set the mark-space density to 1/8

350 OUTPUT 725; ":SOURCE:PRBS:MARK MS2" ! reset to 1/2

360 OUTPUT 725; ":SOURCE:PRBS:MARK?" ! query the density setting

370 ENTER 725; mrk$ ! read the result

380 PRINT mrk$ ! print "markspace density" setting

The N4962A has a programmable PRBS output level which can be set from 300

mv to 1800 mv in 10 mV steps. This block of code demonstrates how to

program this feature.

390 OUTPUT 725; ":SOURCE:VOLTAGE:AMPLITUDE 500" ! set PRBS amplitude to 500mV

400 OUTPUT 725; ":SOURCE:VOLTAGE:AMPLITUDE?" ! query the amplitude

410 ENTER 725; vamp$ ! read the result

420 PRINT vamp$ ! print the amplitude value

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Agilent Technologies N4962A Podręcznik Użytkownika Strona 82