User`s guide

Chapter 4 Features and Functions

Scanning

Scan Once In this configuration, the instrument waits for either a

front-panel key press or a remote interface command before sweeping

through the scan list.

• 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).

• You can specify a scan count which sets the number of front-panel key

presses or scan trigger commands that will be accepted before

terminating the scan. See “Scan Count” on page 102 for more

information.

• Mx+B scaling and alarm limits are applied to measurements during a

Scan Once operation and all data is stored in non-volatile memory.

• Front-Panel Operation:

MANUAL SCAN

To initiate the scan and store all readings in memory, press . The

ONCE annunciator turns on as a reminder that a Scan Once

operation is in progress.

Note: To stop a scan, press and hold

• Remote Interface Operation: The following program segment

configures the instrument for a Scan Once operation.

TRIG:SOURCE BUS

Select the bus (once) configuration

TRIG:COUNT 2

Sweep the scan list 2 times

INIT I

nitiate the scan

Then, send the *TRG (trigger) command to begin each scan sweep.

You can also trigger the instrument from the GPIB interface by

sending the IEEE-488 Group Execute Trigger (GET) message. The

following statement shows how to send a GET message.

TRIGGER 709

Group Execute Trigger

Note: To stop a scan, send the ABORt command.

34970A Refresh UG.book Page 98 Wednesday, February 17, 2010 12:34 PM