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Arbitrary Waveform Generation
Frequency and Amplitude Control with Arbitrary Waveforms 9
chapter 7, Triggered Burst and Gate. At each trigger the current waveform cycle plus
one further whole cycle are completed before the waveform of the next segment is
started.
If trig level is selected the sequence runs continuously through each segment in
turn (one cycle per segment) while the trigger level is true. When the trigger level goes
false the waveform currently selected runs continuously until the level goes true again, at
which point the sequence runs continuously through each segment in turn again. The
trigger level source can be any of the settings selected on the TRIGGER IN set-up
screen with the exception of the MAN TRIG key which can only produce an edge, not a
level, when pressed.
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 an essentially similar manner as with standard
waveforms; the differences are as follows:
Frequency
Pressing the FREQuency key with an arbitrary waveform selected calls the
ARBITRARY FREQUENCY screen:
ARB FREQUENCY: int
100·00000 MHz
sample waveform
freq period
Arbitrary mode uses clock synthesis generation (see Principles of Operation in chapter 4,
Initial Operation) which has a setting resolution of only 8 digits. However, the clock can
also be provided from an external source via the rear panel ARB CLOCK IN/OUT
socket or, on multi-channel instruments, the system clock. The clock source switches
between internal and external clock with alternate presses of the ARB FREQUENCY
soft key. When external clock is selected the ARB FREQUENCY screen changes to:
ARB FREQUENCY: ext
source: ext arb clk
9-13
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