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Chapter 4 Remote Interface Reference
Arbitrary Waveform Commands
4
Arbitrary Waveform Commands
DATA VOLATILE, <value>, <value>, . . .
Download floating-point values from -1 to +1 into volatile memory.
You can download from 1 to 65,536 (64K) points per waveform.
The function generator takes the specified number of points and expands
them to fill waveform memory. If you download less than 16,384 (16K)
points, a waveform with 16,384 points is automatically generated. If you
download
more than
16,384 points, a 65,536-point waveform is generated.
• The values -1 and +1 correspond to the peak values of the waveform
(if the offset is 0 volts). For example, if you set the amplitude to
10 Vpp (0V offset), “+1” corresponds to +5V and “-1” corresponds to -5V.
• The maximum amplitude will be limited if the data points do not
span the full range of the output DAC (Digital-to-Analog Converter).
For example, the built-in “Sinc” waveform does not use the full range
of values between ±1 and therefore its maximum amplitude is
6.087 Vpp (into 50 ohms).
• Downloading floating-point values (using DATA VOLATILE) is slower
than downloading binary values (using DATA:DAC VOLATILE) but is
more convenient when using trigonometric functions which return
values from -1 to +1.
•The DATA command overwrites the previous waveform in
volatile
memory (and no error will be generated). Use the
DATA:COPY
command to copy the waveform to
non-volatile
memory.
• Up to four user-defined waveforms can be stored in non-volatile
memory. Use the DATA:DEL command to delete the waveform in
volatile memory or any of the four user-defined waveforms in non-
volatile memory. Use the DATA:CAT? command to list all waveforms
currently stored in volatile and non-volatile memory (as well as the
five built-in waveforms).
• After downloading the waveform data to memory, use the FUNC:USER
command to choose the active waveform and the
FUNC USER
command
to output it.
• The following statement shows how to use the DATA command to
download seven points to volatile memory.
DATA VOLATILE, 1, .67, .33, 0, -.33, -.67, -1
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