BNC 645 User Manual
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values from -1 to +1.
•
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
DATA:DAC VOLATILE, {
memory. You can download from 1 to 65,536 (64K) points per waveform in
IEEE-488.2 binary block format or as a list of values. The range of values
corresponds to the values available using internal 14-bit DAC (digital-to-Analog
Converter) codes. The waveform 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.
z
The values -8191 and +8191 correspond to the peak values of the
waveform (if the offset is 0 volts). For example, if you set the output
amplitude to 10 Vpp, “+8191” corresponds to +5V and “-8191”
corresponds to -5V.
z
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 sine wave does not use the full range of binary
values between ±1 and therefore its maximum amplitude is 6.087 Vpp
(into 50 ohms).
z
The DATA:DAC 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.
z
The on-volatile memory can store up to four user-defined waveforms.
Use DATA:CAT? Command to list all waveforms stored in volatile and
non-volatile memory.
z
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.
z
The following statement shows how to use the DATA:DAC command to
download seven integer points using the binary block format.