HP 34970A manual ∙ Front-Panel Operation, Select the bus once configuration, Group Execute Trigger

Chapter 4 Features and Functions

Scanning

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 86 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.

NTo 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	Initiate the scan

Then, send the *TRG (trigger) command to begin each scan sweep. You can also trigger the instrument from the HP-IB interface by sending the IEEE-488 Group Execute Trigger (GET) message.

The following statement shows how to send a GET using HP BASIC.

TRIGGER 709 Group Execute Trigger

NTo stop a scan, send the ABORt command.

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