3Operating and Programming

Scanning on Alarm

Usage:

•L4450A 64- Bit Digital I/O (counter channels only)

•L4452A Multifunction Module (totalizer channels only)

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. 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.

NOTE

For complete details on configuring and using alarms, refer to

“Alarm Limits" on page 84.

 

 

 

•In this scan configuration, you can 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 the instrument’s 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 scan trigger commands that will be accepted before terminating the scan. See “Trigger Count" on page 75 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.

The following program segment configures the instrument to continuously scan when an alarm is detected.

TRIG:SOURCE ALARM1

Select alarm configuration

TRIG:SOURCE:ALARM CONT

Select continuous scan mode

CALC:LIM:UPPER 10.25,(@1003)

Set upper alarm limit

CALC:LIM:UPPER:STATE ON,(@1003)

Enable alarms

OUTPUT:ALARM1:SOURCE (@1003)

Report alarms on Alarm 1

ROUT:MON:CHAN (@1003)

Select monitor channel

ROUT:MON:CHAN:ENABLE ON,(@1003)

Enable monitoring on channel

ROUT:MON:STATE ON

Enable monitor mode

INIT

Initiate the scan

74

L4400 User’s Guide

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Agilent Technologies L4400 manual Scanning on Alarm, Alarm Limits on
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