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Features and Functions 2
34980A User’s Guide 49
Front Panel Operation: Scan (Configure) > INTERVAL > EXTERNAL
To initiate the scan and store all readings in memory, press the
Scan (Measure) key. Between scan sweeps, “WAITING FOR TRIG” will be
displayed on the front panel. When a TTL pulse is received, the scan
starts and readings are stored in memory.
Note: To stop a scan, press and hold the Scan (Measure) key.
Remote Interface Operation: The following program segment configures the
instrument for an external scan.
Note: To stop a scan, press and hold the Scan (Measure) key.
Trigger Count
You can specify the number of triggers that will be accepted by the
internal DMM before returning to the “idle” state. The trigger count applies
to both scanning and stand-alone DMM measurements (with no scan list).
• Select a trigger count between 1 and 500,000 triggers, or continuous.
• You can store at least 500,000 readings in memory and all readings are
automatically time stamped. If memory overflows, the new readings will
overwrite the first (oldest) readings stored; the most recent readings are
always preserved.
• You can specify a trigger count in conjunction with a sample count and
a sweep count. The three parameters operate independent of one
another, and the total number of readings returned will be the product
of the three parameters.
• The
CONFigure and MEASure? commands automatically set the scan
trigger count to 1.
• The instrument sets the scan trigger count to 1 after a Factory Reset
(
*RST command). An Instrument Preset (SYSTem:PRESet command) or
Card Reset (SYSTem:CPON command) does not change the setting.
Front Panel Operation: Scan (Configure) > SCAN TRIGGER > COUNTED|INFINITE
Remote Interface Operation: TRIGger:COUNt
To configure a continuous scan, send TRIG:COUNT INFINITY.
TRIG:SOURCE EXT
TRIG:COUNT 2
INIT
Select external mode
Sweep the scan list 2 times
Initiate the scan