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48 34980A User’s Guide
2 Features and Functions
Remote Interface Operation: The following program segment configures the
instrument for a manual scanning operation.
Then, send the
*TRG (trigger) command to begin each scan sweep.
The
*TRG command will not be accepted unless the internal DMM is in
the “wait-for-trigger” state.
Note: To stop a scan, press and hold the Scan (Measure) key.
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 “Trigger
Count” on page 49 for more information.
• If the instrument receives an external trigger before it is ready to
accept one, it will buffer one trigger and then ignore any additional
triggers received (no error is generated).
• 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.
TRIG:SOURCE BUS
TRIG:COUNT 2
INIT
Select bus (manual) mode
Sweep the scan list 2 times
Initiate the scan
Ext Trig Input connector (as viewed from rear of instrument)
Input
5 V
0 V
> 1 µs
Ext Trig Input (Pin 6)
Gnd (Pin 9)
1
5
6
9