R&S ESU Series Operating Manual page 694

R&S ESU
TRACe<1|2>:IQ:DATA:MEMory[:RF]? <offset samples>,<# of samples>
This command permits the readout of previously acquired (and frequency response corrected) I/Q data
from the memory, with indication of the offset related to the start of measurement and with indication
of the number of measurement values. Therefore a previously acquired data set can be read out in
smaller portions. The maximum amount of available data depends on the settings of command
TRACe:IQ:SET, the output format on the settings in the FORMat – subsystem.
The command requires that all requested measurement data be completely
retrieved before the device accepts any further commands.
If no baseband IQ data is available in the memory because the associated mea-
surement has not yet been started, the command generates a query error.
Parameter: <offset samples>: Offset of the values to be output, referenced to the start of the
sampled data.
Value range: 0 ... <# of samples> - 1, where <# of samples> is the value specified
with the TRACe:IQ:SET command
<# of samples>: Number of measurement values to be read.
Value range: 1 ... <# of samples> - <offset samples> where <# of samples> is the
value specified with the TRACe:IQ:SET command.
Example:
"TRAC:IQ:STAT ON"
'activates the I/Q data sampling
"TRAC:IQ:SET NORM,10MHz,32MHz,EXT,POS,100,4096"
'configures the measurement:
'Filter type: Normal
'RBW: 10 MHz
'Sample Rate: 32 MHz
'Trigger Source: External
'Trigger Slope: Positive
'Pretrigger Samples: 100
'# of Samples: 4096
"INIT;*WAI"
'starts the measurement and waits for its end
"FORMat REAL,32"
'specifies the format of the response data
'Reading the results:
"TRAC:IQ:DATA:MEM? 0,2048"
'reads in 2048 I/Q values starting with the beginning of the sampling
"TRAC:IQ:DATA:MEM? 2048,1024"
'reads in 2048 I/Q values starting with the beginning of the sampling
"TRAC:IQ:DATA:MEM? 100,512"
'reads in 512 I/Q values starting with the trigger time (<Pretrigger Samples> was
100)
Return value: Irrespective of the output format selected, the data is scaled linearly with 'V' as the
unit and corresponds to the voltage at the RF input of the device.
The return buffer is similarly configured to the return buffer with the TRACe:IQ:
DATA? command where all I data has the value 0.
Operating Manual 1302.6163.12 - 03
Remote Control – Description of Commands
TRACe Subsystem
6.255