Rohde & Schwarz R&S FSP Series, Operating Manual

Page: 638 / 796

R&S FSP Remote Control – Description of Commands
TRACe Subsystem
6.244 Operating Manual 1164.4556.12 - 06
# of I-data = # of Q-data = (# of DataBytes) / 8
The offset of Q-data in the output buffer can be calculated as follows:
Q-data offset = (# of DataBytes) / 2 + LengthIndicatiorDigit
with LengthIndicatorDigits being the number of digits of the length indicator including the '#'. In the
example above (#41024...) this results in a value of 6 for LengthIndicatorDigits and the offset for the
Q-data will result in 512 + 6 = 518.
Characteristics: *RST value: --
SCPI: device-specific
Mode: A-T
TRACe<1|2>:IQ:SET <filter type>,<rbw>,<sample rate>,<trigger source>,<trigger slope>,
<pretrigger samples>,<# of samples>
This command defines the settings of the analyzer hardware for the measurement of I/Q data.
This allows setting the bandwidth of the analog filters in front of the A/D converter as well as setting
the sample rate, trigger conditions and the record length.
Parameter: <filter type>: NORMAL
Selects the analog analyzer resolution filters as filter type. This is currently the only
available filter type.
<rbw>: Bandwidth of the analog filters in front of the A/D converter.
Value range: 300 kHz – 10 MHz in steps of 1, 3, 10
<sample rate>: Sampling rate for the data acquisition.
Value range: 15.625 kHz, 31.25 kHz, 62.5 kHz, 125 kHz, 250 kHz, 500 kHz, 1 MHz,
2 MHz, 4 MHz, 8 MHz, 16 MHz, 32 MHz for <filter type> = NORMal
<trigger mode>: Selection of the trigger source used for the measurement.
Values: IMMediate | EXTernal | IFPower | RFPower
Using the command with the *RST values for the
TRAC:IQ:SET
command, the
following minimum buffer sizes for the response data are recommended:
ASCII format: 10 kBytes
Binary format: 2 kBytes
If this command is omitted, the current analyzer settings will be used for the corre-
sponding parameters.