164 Chapter 4
Basic Digital Operation
Using Waveform Scaling
Figure 4-26 Waveform Scaling
Although scaling maintains the basic shape of the waveform, too much scaling can compromise its integrity
because the bit resolution can be so low that the waveform becomes corrupted with quantization noise.
Maximum accuracy and optimum dynamic range are achieved by scaling the waveform just enough to
remove the DAC over-range error. Optimum scaling varies with waveform content.
Scaling a Currently Playing Waveform (Runtime Scaling)
This section demonstrates how to make real-time scaling adjustments to a currently playing waveform. This
type of scaling does not affect the waveform file and is well suited for eliminating DAC over-range errors.
In the Dual ARB Player
To play a waveform in the Dual ARB Player, ensure that the waveform exists in volatile memory. This
procedure first creates a waveform file using the Custom modulation format, which the signal generator
automatically stores in volatile memory.
1. Press
Preset > Mode > Custom > Arb Waveform Generator > Digital Modulation Off On to On. This generates a
custom arbitrary waveform for use in this procedure. You can also use a previously stored or
downloaded waveform.
2. Press
Mode > Dual ARB > Select Waveform and ensure that AUTOGEN_WAVEFORM is highlighted on the
display. AUTOGEN_WAVEFORM is the default name assigned to the waveform you generated in the
previous step.
3. Press
Select Waveform. This selects the waveform and returns you to the previous softkey menu.
4. Press
ARB Off On to On. This plays the selected waveform.
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