User`s manual

BASIC Program Example (DRIFT)
1 !RE-STORE"DRIFT"
2 !This program sets up two AFG’s to output 1 MHz square waves.
3 !To prevent these signals from drifting and creating a phase
4 !difference, the reference oscillator of a "master" AFG is shared
5 !by a "servant" AFG. The master’s reference oscillator signal is
6 !output on VXI backplane trigger line ECLT0.
10 !Assign I/O paths between the computer and the AFGs.
20 ASSIGN @Afg_m TO 70910 !master AFG
30 ASSIGN @Afg_s TO 70911 !servant AFG
40 COM @Afg_m,@Afg_s
50 !
60 !Set up error checking
70 CALL Rst
80 OUTPUT @Afg_m;"*CLS" !master
90 OUTPUT @Afg_m;"*SRE 32"
100 OUTPUT @Afg_m;"*ESE 60"
110 OUTPUT @Afg_m;"*OPC?"
120 ENTER @Afg_m;Complete
130 !
140 OUTPUT @Afg_s;"*CLS" !servant
150 OUTPUT @Afg_s;"*SRE 32"
160 OUTPUT @Afg_s;"*ESE 60"
170 OUTPUT @Afg_s;"*OPC?"
180 ENTER @Afg_s;Complete
190 ON INTR 7 CALL Errmsg
200 ENABLE INTR 7;2
210 !
220 !Call the subprograms which reset the AFGs output sine waves 180
230 !degrees out of phase.
240 CALL Square_wave_m
250 CALL Square_wave_s
260 !
270 !Set master AFG to wait-for-arm state
280 OUTPUT @Afg_m;"INIT:IMM" !start waveform
290 !
300 WAIT .1 !allow interrupt to be serviced
310 OFF INTR 7
320 END
330 !
340 SUB Square_wave_m
350 Square_wave_m: !Subprogram which sets up master AFG
360 COM @Afg_m,@Afg_s
370 OUTPUT @Afg_m;"SOUR:ROSC:SOUR INT2;"; !reference osc. source
380 OUTPUT @Afg_m;":TRIG:STAR:SOUR INT2;"; !trigger source
390 OUTPUT @Afg_m;":SOUR:FREQ2:FIX 1E6;"; !frequency
400 OUTPUT @Afg_m;":SOUR:FUNC:SHAP SQU;"; !function
410 OUTPUT @Afg_m;":SOUR:VOLT:LEV:IMM:AMPL 5V" !amplitude
Continued on Next Page
220 Marker Outputs/Multiple AFG Operations Chapter 6