Keysight E4428C ESG RF Programming Manual page 228

Creating and Downloading Waveform Files
Understanding Waveform Data
NOTE Whenever you interchange files between signal generator models, ensure that all scaling is
adequate for that signal generator's waveform.
32767
Max input value
–32768
There is no single scaling value that is optimal for all waveforms. To achieve the maximum dynamic
range, select the largest scaling value that does not result in a DAC over–range error. There are two
ways to scale the I/Q data:
• Reduce the input values for the DAC.
• Use the SCPI command :RADio:ARB:RSCaling <val> to set the waveform amplitude as a
percentage of full scale.
NOTE The signal generator factory preset for scaling is 70%. If you reduce the DAC input values,
ensure that you set the signal generator scaling (:RADio:ARB:RSCaling) to an appropriate
setting that accounts for the reduced values.
To further minimize overshoot problems, use the correct FIR filter for your signal type and adjust
your sample rate to accommodate the filter response.
220
Interpolation
DAC over–range
Interpolation
No over–range
Keysight Signal Generators Programming Guide
Scaling effect