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How the AFG Generates Arbitrary Waveforms
Chapter 3
Refer to Figure 3-1. An arbitrary waveform consists of two parts, a
waveform segment (or all points on a waveform) and a segment sequence.
The segments contain the actual voltage points of the waveform. The
segment sequence determines which waveform segments are to be output.
The AFG has four waveform segments available: A, B, C, and D. The size
of each waveform segment is 4096 points. Thus, to store data into a
waveform segment, the number of data items (or waveform points) must be
4096.
To output a waveform, set the user function to output one or more of the
waveform segments. To output a waveform with a single waveform
segment, use one of the A through D waveform segments. To output
waveforms with multiple waveform segments, use a combination of AB or
ABCD waveform segments. The AB combination outputs the 8192 point
waveform defined by the A and B waveform segments. Thus, the A
segment is output first and then the B segment. The ABCD combination
outputs the 16384 point waveform defined by the A , B, C, and D waveform
segments. Thus, the A segment is output first and the D segment is output
last.
Similarly, the AB combination outputs a waveform with 8192 points and
the ABCD combination outputs a waveform with 16384 points.
The segment values can be either sent as voltage values
(use
[SOURce:]LIST[:SEGMent]:VOLT <
(digital-to-analog converter) codes
(use
[SOURce:]LIST[:SEGMent]:VOLT:DAC <
If sent as voltage values, the AFG converts them to DAC codes before
storing them in memory.
To output a waveform, the AFG sets the DAC to the voltage value of the
selected waveform segment. The waveform frequency determines the
waveform repetition rate.
Generating Arbitrary Waveforms with the HP E1340A
voltage_list
>
) or DAC
voltage_list
).
>
56
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