Chapter 4 Features and Functions

Scanning

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.

NSx wxt” vy”z”z tw ”z ttxyx “Alarm Limits” starting on page 122.

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 86 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.

Front-Panel Operation:

SCAN ON ALARM

To enable the Monitor function select the desired channel and then

press . To initiate the scan, press . When an alarm event occurs, the scan starts and readings are stored in memory.

NTo stop a scan, press and hold .

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Image 83
HP 34970A manual Sx wxt vyzz tw z ttxyx Alarm Limits starting on, On page 86 for more information