Arb Waveform Terms
Horizontal Size
Number
of
horizontal points is the time component
of
the waveform. Minimum size is
10 points, and a maximum size is 65536 points (131,072 points with extended memory).
The horizontal size must always be an even number.
Waveform Address
Bach horizontal point on an Arb waveform is defmed by a discrete address. Addresses
start a 0000 thus the ending address always appears to be one less than the number you
prograrnmed. For example, a 10 point waveform starts at 0 and ends at 9.
Arbitrary Waveforms and Frequency
A typical Arb waveform uses only a part
of
memory in the Model 395. These waveforms
are stored as files in the unit's memory. Bach file has a name and size (numberofpoints).
The size
of
these waveforms combined with the scan speed (sample
dock
frequency)
give the waveform frequency.
In example 2 in section 3, the waveform, GRAY, is 2540
points long and has a period
of
64
!AS.
Using this information we can calculate the sample
dock
used by the Model 395.
Waveform Size
*Sample
dock
period waveform period
Solving for Sample
dock;
Sample
dock
period Waveform period 1Waveform size
Thus, Sample
dock
period =
64
f.lS
12540 points
gives, Sample
dock
period =25.20 ns
or, Sample
dock
=39.69 MHz.
Data Value
Bach horizontal point
in
an Arb waveform is defined
by
a discrete data
or
amplitude
value.
Data
values range between -2048 and +2047 about +0000.
Arbitrary Waveforms and Amplitude
When
playing
Arbitrary waveforms, the
output
amplitude will
depend
on
the
data
values. For example, creating a waveform that contains data points ranging from -2048
to +2047 will produce an output 100%
of
the prograrnmed
peak
to
peak
amplitude.
If
the waveform was created using a portion
of
the
data
points, say 0000 to 2048, the
output will
be
50%
of
the prograrnmed amplitude.
4.4.3.2 Creating Waveforms
Create an
Arb
waveform by giving the waveform a name, defining its size, and editing
the
waveform.
AIso,
existing
standard
or
arbitrary
waveforms
can
be
copied
or
renamed. Pressing the CREATE key displays the Create
New
Waveform screen; see
figure 4-12. From tbis screen either create a new blank waveform
or
copy and rename
an existing waveform.
CREATE NEW WAVEFORM
(avail mem: 57868)
• create blank ...
<0
create from copy ...
Figure 4-12. Create New Waveform
Front Panel Operation Reference 4-17
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