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SEQuence:ADVance(?){AUTOmatic|STEP|SINGle|MIXed}
Purpose
This command will select the sequence advance mode. The way the instrument advances through the sequence
links can be specified by the user.
•
AUTOmatic - specifies continuous advance where the generator steps continuously to the end of the
sequence table and repeats the sequence from the start. For example, if a sequence is made of three
segments 1, 2 and 3, the sequence will generate an infinite number of 1,2,3,1,2,3,1,2,3...waveforms. Of
course, each link (segment) can be programmed with its associated loop (repeat) number. AUTO is the
default sequence advance mode.
•
In STEP advance mode, the sequence is advanced to the next waveform only when a valid trigger is
received. The output of the LW120 generates the first segment continuously until a trigger signal
advances the sequence to the next segment. If repeats were selected for a segment, the loop counter is
executed automatically.
•
In SINGle advance mode, the generator idles between steps until a valid trigger signal is sensed. This
mode operates with trigger mode only. An attempt to select the SING advance mode when the LW120
is in continuous operating mode will generate an error. After trigger, the generator outputs one
waveform cycle. Then, the output level idles at a DC level equal to the last point of the last generated
waveform. If loops (repeats) were programmed, the output will repeat this segment every time a trigger
is received. Only after executing all of the programmed loops will the sequence step to the next
assigned segment.
•
MIXed mode is a special mode, which combines continuous step advance with single step advance in a
sequence. There are three conditions for the sequence generator to operate in this mode:
1) The LW120 must be set to operate in continuous mode
2) Select the MIX sequence advance mode
Remote Programming Reference 4-52
15
SEGMENT NUMBER
32
23
15
REPEAT
X
TRUNCATE
MODE
15
7
0/23
FORMAT
SEG #
Figure 4-6
. 48-bit Sequence Table Download Format
7
0
(INTEGER)
7
0
(LONG)
7
0
(BYTE)
15
7
0/7
0
REPEAT
LSB 0 = NORMAL
MODE
LSB 1 = TRIG'D
User Manual LW120
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