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320 SUB Ramp_wave
330 Ramp_wave: !Subprogram which defines ramp waveform
340
COM @Afg,@Afg1,INTEGER Waveform(*)
350
FOR I=1 TO 4096
!calculate waveform points as dac
codes
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Waveform(I)=((I*.00122)/.0025)+2048
NEXT I
!
OUTPUT @Afg;“SOUR:ARB:DAC:SOUR INT” !dac data source
(internal)
400
OUTPUT @Afg;“SOUR:LIST:SEGM:SEL A”!select segment name
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OUTPUT @Afg USING “#,K”;“SOUR:LIST:SEGM:VOLT:DAC #48192”
OUTPUT @Afg1;Waveform(*) !8192 bytes: 4 digits
(2 bytes/ampl point)
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OUTPUT @Afg
!CR LF
SUBEND
!
SUB Rst
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•
530
SUB Errmsg
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C and QuickBASIC
Program Versions
Transferring Data in C
The C example program, DACBLOK.C, is in directory “CPROG” and the
QuickBASIC example program, DACBLOK.BAS, is in directory
“ QBPROG” on the C and QuickBASIC example disk (part number
E1340-10036).
To transfer Definite Length Block Data to the AFG requires that the data
sent with the [SOURce:]LIST[:SEGMent]:VOLTage:DAC command must be
contiguous. To do this, send no carriage return (CR) and line feed (LF)
before transferring all the data. The send_data function does this as follows
(refer to the C function below):
1. Disable EOI and EOL using IOEOI (ISC, 0) and IOEOL (ISC, “ ”, 0),
respectively. ISC contains the HP-IB select code, and the 0 and “ ”
(NULL) values disables the carriage return (CR) and line feed (LF)
to allow the AFG to receive a command string without a terminator.
2. Next, sent to the AFG the SCPI
[SOURce:]LIST[1][:SEGment]:VOLTage:DAC command string using
IOOUTPUTS (ADDR, commands, strlen(commands)). ADDR
contains the AFG HP-IB address, commands contains the SCPI
command string, and strlen(commands) contains the string length of
commands. This enables the AFG to receive voltage data. Since CR
or LF is disabled, the AFG holds execution until all the data is sent.
Chapter 6
HP E1340A High Speed Operation
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