Features and Functions 2
34980A User’s Guide 49
Remote Interface Operation: The following program segment configures the
instrument for a manual scanning operation.
Then, send the
*TRG (trigger) command to begin each scan sweep.
The
*TRG command will not be accepted unless the internal DMM is in
the “wait- for- trigger” state.
Note: To stop a scan, send the
ABORt command.
Scanning on Alarm
In this configuration, the instrument initiates a scan each time a reading
crosses an alarm limit on a channel. You can also assign alarms to
channels on the digital modules (34950A and 34952A). For example,
you can generate an alarm when a specific bit pattern or bit pattern
change is detected on a digital input channel or when a specific count is
reached on a totalizer channel.
• 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. Channels do not have to be part of an active scan list
to be monitored; however, the channel must be configured for a
measurement in order to be monitored.
• All readings from the scan are stored in volatile memory.
Readings accumulate in memory until the scan is terminated
(until the trigger count is reached or until you abort the scan).
• You can specify a trigger count which sets the number of front- panel
key presses or scan trigger commands that will be accepted before
terminating the scan. See “Trigger Count” on page 52 for more
information.
• Mx+B scaling and alarm limits are applied to measurements during a
manual scanning operation and all data is stored in volatile memory.
TRIG:SOURCE BUS
TRIG:COUNT 2
INIT
Select bus (manual) mode
Sweep the scan list 2 times
Initiate the scan
NOTE
For complete details on configuring and using alarms, refer to
“Alarm Limits” on page 68.
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