Remote Control Commands
R&S
®
SMW200A
968User Manual 1175.6632.02 ─ 16
PeakOffset_dB Defines the peak level offset of the signal relative to full scale for
the ARB signal in the WAVEFORM tag. The offset is defined in
ASCII float format.
The value usually equals 0 dB as usually the I/Q samples
(signed 16-bit integer values) are modulated to full scale: Full
scale = 0 dB = max. amplitude of vector of I/Q samples = |S
IQ
|
max = sqrt(I
2
+Q
2
)max = (2
15
)-1 = 32767.
A positive PeakOffset_dB value indicates that a headroom to
full scale is provided when generating the waveform. A negative
PeakOffset_dB value indicates that overrange is likely for some
samples, i.e. clipping might occur.
The crest factor can be calculated from the two values as fol-
lows:
Crest Factor = |PeakOffset_dB - RMSOffset_dB|
Example:
{LEVEL OFFS: 3.45,2}
BB:ARB:WAV:TAG? 'LEVEL OFFS'
Queries the content of the LEVEL OFFS tag of the selected
waveform file.
Response: 3.45,2
The level of the waveform is below full scale, clipping does not
occur.
Usage: Setting only
{SAMPLES: Samples}
(recommended for waveforms)
The tag contains the number of I/Q samples in the waveform in ASCII format.
On multi-segment waveforms, this tag contains the total I/Q samples of all segments.
Example:
{SAMPLES: 1000}
BB:ARB:WAV:TAG? 'SAMPLES'
Queries the content of the SAMPLES tag of the selected wave-
form file.
Response: 1000
The waveform contains 1000 I/Q samples.
Usage: Setting only
See also "How to Define Periodically Repeating Traces" on page 974.
{[TRACE] LIST [#]: Pos0:State0; Pos1:State1; ...PosN-1:StateN-1}
(mandatory for control lists / optional for waveforms)
The tag contains the data for the marker and control signals in the control list or the
marker signals of ARB waveforms.
Traces are processed different, depending on the selected CONTROL LENGTH.
See also "How to Define Periodically Repeating Traces" on page 974.
SOURce Subsystem
To Next Page
Loading...
