Keysight M8190A - Page 59

M8190A User Interface 2
M8190A User’s Guide 59
Additional Waveform Parameters Section
 Waveform Length
It is indicator only. The length is in samples of the resulting segment.
 Max. Wfm. Length
Maximum waveform length must be used to force the resulting waveform to be
shorter or equal to the limit set by the user.
 Keep Sample Rate
This check box preserves the sampling rate to a user-defined value irrespective of
the manner in which other signal parameters may be defined. Keeping the
sampling rate to a fixed value may be necessary when multiple waveforms are
created for usage in a sequence or scenario.
 Sample Rate
Final DAC conversion rate for the resulting signal. It may be set by the user or
automatically calculated depending on other signal parameters.
Scaling Section
 DAC Max
Multi-tone waveforms may occupy a limited range of the DAC’s full scale. This
parameter sets the maximum level. If set to a lower level than DAC Min, this will be
automatically set to the same level. Acceptable range for this parameter is -1/+1,
being the full dynamic range of the instrument’s DAC.
 DAC Min
Multi-tone waveforms may occupy a limited range of the DAC’s full scale. This
parameter sets the minimum level. If set to a higher level than DAC Max, this will
be automatically set to the same level. Acceptable range for this parameter is -
1/+1, being the full dynamic range of the instrument’s DAC.
Marker Section
 Sample Marker
Sample marker signaling the beginning of each segment may be activated
(Segment selection) and deactivated (None selection).
 Sync Marker
Sync marker signaling the beginning of each segment may be activated (Segment
selection) and deactivated (None selection).
Crest Factor Section
 It is an indicator only.
It shows the estimated PAPR for the current waveform in dB. Although the
definition of the PAPR parameter is always the ratio between the peak and the
average power for a signal, results change depending on the working mode. For
up-converter modes, the result reflects the PAPR of the envelope of the resulting
signal while for direct generation it reflects the overall signal. The difference
between the former and the latter values is close to +3dBs in most cases.