2-16 List Sweep Commands
Programming with GPIB Commands
2-42
PN: 10370-10374 Rev. F
MG369xC GPIB PM
List Sweep Triggering
Four different modes of triggering are available in list sweep mode—automatic, external, single, and manual.
When automatic, external, or single trigger mode is selected, the output sweeps between the specified list start
and stop indexes, dwelling at each list index for the specified dwell time. When manual trigger mode is
selected, the list start index, list stop index, and dwell time parameter are not used. Instead, the list index is
incremented using the
UP
command or an external TTL trigger and is decremented using the
DN
command.
The
AUT
command selects automatic sweep triggering and the
HWT
command selects external sweep triggering.
When external sweep trigger mode is selected, the output sweep recurs when triggered by an external
TTL-compatible clock pulse to the rear panel
AUX I/O
connector. The
EXT
command selects single list sweep
triggering. When single sweep trigger mode is selected, a single list sweep starts when the
TRG
command is
received.
The
MNT
command selects the manual trigger mode. In manual trigger mode, the list index is incremented by
one each time the
UP
command is received or each time an external TTL trigger is received. The list index is
decremented by one each time the
DN
command is received.
Generating a List Sweep
Generating a list sweep involves selecting a sweep range, a dwell-time-per-step, and a sweep trigger. The
sweep range is defined by a list start index and a list stop index. Use the
LIB(xxxx)
command to set the list
start index and the
LIE(xxxx)
command to set the list stop index. The dwell-time-per-step of the list sweep is
changed using the
LDT
parameter entry command. Select a trigger for the list sweep using the list sweep
trigger commands previously described.
Programming Example:
Programming “
LIB1234 LIE1237 EXT LDT 10 MS TRG
” implements a list sweep from the current list index
1234 to index 1237 in single trigger mode with a 10 ms dwell-time-per-step, then triggers a single sweep.
List Calculations
During the initial sweep, the signal generator performs calculations to set the frequency and power levels. This
causes the initial list sweep to take longer than each subsequent sweep. The command,
LEA
, initiates a process
that examines every index in the current list and performs all the calculations necessary to set the frequency
and power levels. This lets the initial list sweep be as fast as each subsequent sweep.
The list calculations are for the current list only. Any changes to the current list or selection of another list
requires the calculations to be performed again. The calculations are stored only in volatile RAM and are lost
when power to the signal generator is turned off.
Summary of Contents for MG369 C Series
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