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76 L4400 User’s Guide
3 Operating and Programming
• You can store at least 500,000 readings in memory and all readings are
automatically time stamped. If memory overflows, the new readings will
overwrite the first (oldest) readings stored; the most recent readings are
always preserved.
• You can specify a trigger count in conjunction with a sweep count. The two
parameters operate independent of one another, and the total number of
readings returned will be the product of the two parameters.
• The CONFigure and MEASure? commands automatically set the scan
trigger count to 1.
• The instrument sets the scan trigger count to 1 after a Factory Reset (*RST
command). An Instrument Preset (SYSTem:PRESet command) or Card
Reset (SYSTem:CPON command) does not change the setting.
The following command sets the trigger count:
TRIGger:COUNt
To configure a continuous scan, send TRIG:COUNT INFINITY.
Sweep Count
Usage:
• L4450A 64- Bit Digital I/O (digital input, counter channels only)
• L4452A Multifunction Module (digital input, totalizer channels only)
The sweep count sets the number of sweeps per trigger event during a scan (a
sweep is one pass through the scan list).
Figure 3-11. Sweep Count Diagram.
• The sweep count is valid only while scanning. If no channels have been
assigned to the scan list, the specified sweep count is ignored (no error is
generated).
t
Sweep 1Trigger
Sweep Count
(1 to 500,000 sweeps)
Sweep 2
Sweep n
Trigger
. . .