R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Remote Control – Description of Commands
TRACe Subsystem
All trigger sources except for VIDeo can be used for triggering. At a sample rate of 81.6 MHz you can
also use a gated trigger. For more information see “GATED TRIGGER”. The number of test points to be
recorded prior to the trigger time can be selected for all of the available trigger sources except for FREE
RUN, where this parameter is always to be assigned the value 0). Measurement results are output in the
form of a list, with the Q values following immediately after the list of I values in the output buffer. The
FORMAT command can be used to select between binary output (32 bit IEEE 754 floating-point values)
and output in ASCII format.
The commands of this subsystem can be used in two ways:
• Measurement and result query with one command:
This method causes the least delay between measurement and output of the result data, but it requires
the control computer to wait actively for the response data.
• Setting up the instrument, start of the measurement via "INIT" and query of the result list at the end of
the measurement:
With this method the control computer can be used for other activities during the measurement. In this
case the additional time needed for synchronization via service request must be taken into account.
TRACe:IQ:DATA:FORMat COMPatible | IQBLock | IQPair
This command sets the data output formatting (using the TRAC:IQ:DATA? command).
For further details see Fig. 6.3.
Parameter: COMPatible: 512k I data and 512k Q data is alternately transferred
IQBLock: First, all I and then all Q data is transferred
IQPair: I/Q data is transferred in pairs
Example: "TRAC:IQ:DATA:FORM IQP"
Characteristics: *RST value: COMP
SCPI: device-specific
Mode: A
If a sampling rate above 81.6 MHz is set, the YIG filter will be automatically
switched off (not available with the R&S FSQ3). If the instrument is switched back
to sampling rates ≤ 81.6 MHz, the previous setting of the YIG filter will be restored.
TRACe:IQ:DATA:MEMory[:RF]? ,
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 measurement
has not yet been started, the command generates a query error.
Operating Manual 1313.9681.12 - 01 6.245