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External Scanning In this configuration, the instrument sweeps
through the scan list once each time a low-going
TTL pulse is received
on the rear-panel Ext Trig Input line (pin 6).
• You can specify a scan count which sets the number of external
pulses the instrument will accept before terminating the scan.
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
Note: To stop a scan, send the ABORt command.
Ext Trig Input
Gnd
Ext Trig Connector
0 V
Input
5 V
> 1 µs
4
Chapter 4 Features and Functions
Scanning
83