R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Remote Control – Description of Commands
Parameter: none
Example: "TRAC:IQ:STAT ON"
'Enables acquisition of I/Q data
"TRAC:IQ:SET NORM,10MHz,32MHz,EXT,POS,0,4096"
'Measurement configuration:
'Filter type: Normal
'RBW: 10 MHz
'Sample Rate: 32 MHz
'Trigger Source: External
'Trigger Slope: Positive
'Pretrigger Samples: 0
'# of Samples: 4096
"FORMat REAL,32"
'Selects format of response data
"TRAC:IQ:DATA?"
'Starts measurement and reads results
TRACe Subsystem
Return value: The result values are scaled linear in unit Volt and correspond to the voltage at the
RF input of the instrument.
ASCII Format (FORMat ASCII):
In this case the command returns a comma separated list of the measured voltage values in floating
point format (Comma Separated Values = CSV). The number of values returned is 2 * number of
samples, the first half being the I-values, the second half the Q-values.
Binary Format (FORMat REAL,32):
With >512 k ≡ 524288 samples, the data is transmitted in logical blocks of 512k
values. See below.
In this case, the command returns binary data (Definite Length Block Data according to IEEE 488.2),
with the lists of I- and Q-data being arranged one after the other in 32 Bit IEEE 754 floating point data.
The scheme of the response string is as follows:
#44096......
with
– #4: digits of the subsequent number of data bytes (4 in the example)
– 4096: number of subsequent data bytes (# of DataBytes, 4096 in the example)
– : 4-Byte-Floating Point I-value; max. 512k
– : 4-Byte-Floating Point Q-value; max. 512k
The number of I- and Q-data can be calculated as follows:
# 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
Operating Manual 1313.9681.12 - 01 6.247