Chapter 4 Features and Functions

Scanning

xIn this configuration, the instrument sweeps through the scan list once each time a low-going TTL pulse is received

on the rear-panel R V

line (pin 6).

 

 

 

 

 

 

 

Ext Trig Input

Gnd

Ext Trig Connector

∙You can specify a scan count which sets the number of external

pulses the instrument will accept before terminating the scan.

4

See “Scan Count” on page 86 for more information.

 

∙If the instrument receives an external trigger before it is ready to accept one, it will buffer one trigger before generating an error.

∙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:

EXTERNAL SCAN

To initiate the scan, press . The EXT annunciator turns on as a reminder that an External Scan is in progress. When a TTL pulse is received, the scan starts and readings are stored in memory. To stop

a scan, press and hold .

∙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

Initiate the scan

NTo stop a scan, send the ABORt command.

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Image 82
HP 34970A Ext Trig Connector, See Scan Count on page 86 for more information, Select the external trigger configuration
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