HP 34970A - Page 81

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 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.
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 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
Note: To stop a scan, send the ABORt command.
Chapter 4 Features and Functions
Scanning
82