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COMMAND REFERENCE 4 - 125
Description:
Controls the trigger source. The command selects the source, and the query
returns the source that triggers the acquisition. If a trigger source other than
IMMediate, INTernal<n>, LINE, or BUS is active, execution error -221 is
generated at receipt of the query. The dual slope selection (EITHer) is only
possible, if the trigger source is INTernal<n> and if in the "real time" mode
(SENSe:SWEep:REALtime ON). If the trigger source becomes BUS, LINE, or
IMMediate, the trigger slope selection is changed to POSitive.
After a
*
RST command, the trigger source is IMMediate for the PM3384B-94B
and EXTernal for the PM33x0B CombiScope instruments (if a signal is available
at the external trigger input channel).
Example:
Send
→ CONFigure:AC (@1) Configures AC-RMS CH1.
Send
→ TRIGger:SOURce INTernal1 Input channel 1 becomes the
trigger source.
Send
→ TRIGger:LEVel 0.2 Trigger level becomes 0.2V.
Send
→ TRIGger:SOURce BUS The GPIB becomes the trigger
source.
Send
→ INITiate Single initiation.
Send
→ *TRG Triggering via the GPIB.
Send
→ FETCh:AC? Fetches AC-RMS values.
Read
← <AC-RMS voltage> Reads AC-RMS value.
Front panel compliance:
The TRIGger:SOURce command is the remote equivalent of the front panel
TRIGGER MAIN TB - chn/line option of the TRIGGER menu.
Programming tip:
For single-shot measurements, the trigger source must be one of the input
channels <n> (INTernal<n>), instead of IMMediate (software automatic trigger).