’Closes file TRACE5.DAT
Refer to section 3.4.3 "Conversion of trace data" about how to convert this string data.
’Reads channel 2 trace ’Writes trace header to file ’Writes trace buffer to file
’Resets the instrument

2 - 8

GETTING STARTED WITH SCPI PROGRAMMING

2.4.2How to acquire repetitive traces

In the program example, 5 trace acquisitions of 512 16-bit samples are done via a probe connected to channel 2. The trace sample bytes are read from the GPIB as string characters and written to the file TRACE5.DAT on the hard disk.

PREPARATIONS:

•Connect a probe from the Probe Adjust signal to channel 2.

PROGRAM EXAMPLE:

’*****

’Acquire 5 sequential traces and store in file TRACE5.DAT:

’*****

DIM tracebuf AS STRING * 1050 CALL Send(0, 8, "*RST", 1)

’

’After *RST a trace acquisition is defined at 512 samples of 16 bits ’(2 bytes).

’

 

CALL Send(0, 8, "CONFigure:AC (@2)", 1)

’Configures channel 2

CALL Send(0, 8, "SENSe:FUNCtion ’XTIMe:VOLTage2’", 1)’Switches channel 2 on

OPEN "O",#1,"TRACE5.DAT"

’Opens file TRACE5.DAT

FOR i=1 TO 5

 

CALL Send(0, 8, "INITiate", 1)

’Single initiation

CALL Send(0, 8, "*WAI;TRACe? CH2", 1)

’Queries for channel 2 trace

’

 

’Notice the *WAI; before TRACe?. The *WAI command takes care that the TRACe? CH2 command is ’executed when the INITiate command is finished.

’

CALL Receive(0, 8, tracebuf$, 256) PRINT #1, "Trace buffer:"; i PRINT #1, LEFT$(tracebuf$, IBCNT%)

NEXT i

CLOSE

Note:

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Fluke PM-3370B, PM-3380B How to acquire repetitive traces, Connect a probe from the Probe Adjust signal to channel
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