User`s guide

100
Chapter 4 Features and Functions
Scanning
• Remote Interface Operation: The following program segment
configures the instrument for an External Scan.
TRIG:SOURCE EXT Select the external trigger configuration
TRIG:COUNT 2 Sweep the scan list 2 times
INIT I nitiate the scan
Note: To stop a scan, send the ABORt command.
Scanning on Alarm In this configuration, the instrument sweeps the
scan list once each time a reading crossing an alarm limit on a channel.
You can also assign alarms to channels on the multifunction module. For
example, you can generate an alarm when a specific bit pattern is
detected or when a specific count is reached.
Note: For complete details on configuring and using alarms, refer to
“Alarm Limits” starting on page 139.
• In this scan configuration, you may use the Monitor function to
continuously take readings on a selected channel and wait for an
alarm on that channel. The monitored channel can be part of the scan
list but you can also use a channel on the multifunction module
(which does not have to be part of the scan list and you do not have to
use the Monitor function). For example, you can generate an alarm on
a totalizer channel which will initiate a scan when a specific count is
reached.
• You can specify a scan count which sets the number of alarms that
will be allowed before terminating the scan. See “Scan Count” on page
102 for more information.
• All readings from the scan are stored in non-volatile memory.
Readings accumulate in memory until the scan is terminated (until
the scan count is reached or until you abort the scan).
• Mx+B scaling and alarm limits are applied to measurements during
the scan and all data is stored in non-volatile memory.
34970A Refresh UG.book Page 100 Wednesday, February 17, 2010 12:34 PM