Loading ...
Loading ...
Loading ...
291, 292, 294
Users Manual
9-2
Introduction
Arbitrary (arb) waveforms are generated by sequentially addressing the RAM containing
the waveform data with the arbitrary clock. The frequency of the arb waveform is
determined both by the arb clock and the total number of data points in the cycle.
In this instrument an arb waveform can have up t
o 1,048,576 horizontal points. The
vertical range is -2048 to +2047, corresponding to a maximum peak-to-peak output of
20 Volts. Up to 500 waveforms can be stored on the memory card and each given a
name; the number that can be stored depends on the number of points in each waveform
and the size of the memory card.
Arb waveforms can be created using basic front panel editing capabilities (particularly
useful for modifying existing standard or arb waveforms) or by using waveform design
software that enables the user to create waveforms from mathematical expressions, from
combinations of other waveforms, or freehand; details are given in appendix E.
Arbitrary Waveform Terms
The following terms are used in describing arb waveforms:
Horizontal size: The number of horizontal points is the time component of the
waveform
. The minimum size is 8 points and the maximum is
1,048,576 points.
Waveform address: Each horizontal point on an arb waveform
has a unique address.
Addresses always start at 0000, thus the end address is always
one less than the horizontal size.
Arb frequency: The arb frequency is the clock rate of the data RAM a
ddress
counters and has a range of 0ยท1 Hz to 100 MHz (internal clock)
or dc to 50 MHz (external clock) on this instrument.
Waveform frequency: The waveform
frequency depends on both the arb frequency and
horizontal size. For example a 1000 point waveform clocked at
an arb frequency of 100 MHz has a waveform frequency of
100e6 divided by 1000 = 100 kHz.
Data value: Each point in the waveform has an am
plitude value in the range
-2048 to +2047.
Waveform amplitude: When playing arb waveforms the
maximum output amplitude
will depend on both the range of data values and the output
amplitude setting. A waveform which includes data values of
-2048 and +2047 will produce a maximum output which is
100 % of the programmed peak-to-peak amplitude; if the
maximum range of the data values is only -1024 to +1023, for
example, the maximum output will only be 50% of the
programmed level.
Principles of Arbitrary Waveform Creation and Modification
Creating arb waveforms with the instrument alone consists of two main steps:
1. Creating a new blank waveform, or a copy of an existing one, and giving it a size and
a na
me
2. Modifying that waveform using the vari
ous editing capabilities to get exactly the
waveform required.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
Loading ...
Loading ...
Loading ...