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Arbitrary Waveform Generation
Frequency and Amplitude Control with Arbitrary Waveforms 9
screen with the exception of the MAN TRIG key (which when pressed can only produce
an edge, not a level).
Providing the step on: field is set to count for all segments the waveform
sequence can also be run in gated and triggered burst modes in the same way as simple
waveforms. Refer to chapter 7, Triggered Burst and Gate for full details.
The individual segments of the sequence can be turned on or off with the on-off soft-
key. Note that turning a segment off will automatically set all subsequent segments off;
turning a segment on will also turn on any others between segment 1 and itself that were
previously off. Segment 1 is always on.
When the whole sequence is defined the set-up is constructed by pressing the done
soft-key which returns the display to the initial SEQUENCE screen. The sequence can
be run and stopped from this screen with the run and stop soft-keys respectively.
Frequency and Amplitude Control with Arbitrary Waveforms
Frequency and Amplitude control work in essentially the same way as for standard
waveforms with the following minor differences.
Frequency
Pressing the FREQuency key with an arbitrary waveform selected calls the
ARBITRARY FREQUENCY screen:
ARBITRARY FREQUENCY
40·00 MHz
sample waveform
freq period
You can set either the frequency or the period, as before, by pressing the freq or
period soft-key respectively. Note that the frequency and period resolution in arbitrary
mode is only 4 digits because clock synthesis generation is used. The Principles of
Operation section in chapter 4, Initial Operation, provides an explanation of the synthesis
technique used.
Additionally, for arbitrary waveforms, frequency or period can be set in terms of the
sample clock frequency, by pressing the sample soft-key, or in terms of the waveform
frequency, by pressing the waveform soft-key. The relationship between them is
waveform frequency = sample frequency divided by waveform size.
Frequency and period entries are made directly from the numeric keypad or by using the
rotary control in the usual way.
Pressing the FREQuency key with sequence selected calls the
SEQ CLOCK FREQUENCY screen:
SEQ CLOCK FREQUENCY
40·00 MHz
freq period
9-15
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