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User Manual 3155
Programming Reference 4-58
Arbitrary Wave-
forms
Arbitrary waveforms are generated from digital data points, which are
stored in memory. Each data point has a vertical resolution of 14 bits
(16384 points), i.e., each sample is placed on the vertical axis with a
precision of 1/16384. The Model 3155 has the following waveform
memory capacity:
1 Meg – standard memory configuration
Each horizontal point has a unique address - the first being 00000
and the last depends on the memory option. In cases where smaller
waveform lengths are required, the waveform memory can be divided
into smaller segments.
When the instrument is programmed to output arbitrary waveforms,
the clock samples the data points (one at a time) from address 0 to
the last address. The rate at which each sample is replayed is de-
fined by the sample clock rate parameter. The 3155 provides pro-
grammable sample clock rates from 100 mS/s to 100 MS/s.
Unlike the built-in standard waveforms, arbitrary waveforms must first
be loaded into the instrument's memory. Correct memory manage-
ment is required for best utilization of the arbitrary memory. An ex-
planation of how to manage the arbitrary waveform memory is given
in the following paragraphs.
Arbitrary Memory
Management
The arbitrary memory in comprised of finite length of points. The
maximum size arbitrary waveform that can be loaded into memory is
1Meg words to load waveforms.
Waveforms are created using small sections of the arbitrary memory.
The memory can be partitioned into smaller segments (up to 4096)
and different waveforms can be loaded into each segment, each
having a unique length. Minimum segment size is 16 points. Informa-
tion on how to partition the memory, define segment length and
download waveform data to the 3155 is given in the following para-
graphs.
Summary of Contents for 3155
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