Fluke DDS Function Generator 271, User Manual

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Special Waveforms
Arbitrary
10
10-3
Arbitrary
Up to 5 user-defined arbitrary waveforms can be down-loaded via the RS232 or GPIB
interfaces and stored, together with a 16-character name in non-volatile RAM; these
waveforms occupy stores 01 to 05 inclusive. Stores 06 onwards contain a number of
frequently used arbitrary waveforms stored in ROM; these may be changed or added to
from time to time in response to user requirements.
Each arbitrary waveform is stored as 1024 points with values in the range -512 to +511,
i.e. 10-bit vertical resolution; -512 and +511 correspond to -10 V and +10 V peaks
respectively with amplitude on the main menu set to maximum. However, the actual
waveform ‘played back’ from the generator can have its amplitude, offset and symmetry
adjusted as if it were a basic sine, square, etc., waveform.
The currently recalled arbitrary waveform is selected by pressing the ARB key; the lamp
beside the ARB key lights to show that arbitrary mode is selected. The
ARB
edit menu
is used to change the currently recalled arbitrary waveform, to store new waveforms in
non-volatile RAM and to name them. The arbitrary edit menu is accessed by pressing the
EDIT key followed by ARB . When arb edit is selected the lamp beside the ARB key
flashes to show edit mode regardless of whether ARB mode is currently selected to be on
or off.
RECALL ARB NO: 14
SINX/X
ENTER TO EXECUTE
Recalling Arbitrary Waveforms
The default arb edit menu is shown above. With the edit cursor in the store number field
each store can be stepped through in turn using the rotary control or direct keyboard
entry. Each stored waveform from ROM will have a reference name in the second line of
the display, e.g.
sinx/x
. The user-defined waveforms in non-volatile RAM will have
the names given by the user during the store procedure, described below.
To recall a particular waveform select the appropriate number and press ENTER . Once
the waveform has been recalled into waveform memory it can be selected by pressing the
ARB key and output at the frequency, amplitude, offset and symmetry defined on the
main menu.
Storing Arbitrary Waveforms
User defined waveforms can be downloaded into non-volatile RAM via the RS232 or
GPIB interface; full details are given in chapter 16,
Remote Control .
Arbitrary waveforms created from the front panel, e.g. staircase waveforms, can be saved
to non-volatile RAM using the arb edit menu. With the edit cursor in the first edit field of
the menu, alternate presses of the
DIGIT
keys will switch the field between
RECALL
and
STORE
.
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