342 Keysight InfiniiVision 4000 X-Series Oscilloscopes Programmer's Guide
12 :COUNter Commands
:COUNter:SOURce
(see page 1428)
Command Syntax
:COUNter:SOURce <source>
<source> ::= {CHANnel<n> | TQEVent}
<n> ::= 1 to (# analog channels) in NR1 format
The :COUNter:SOURce command selects the waveform source that the counter
measures. You can select one of the analog input channels or the trigger qualified
event signal.
With the TQEVent (trigger qualified event) source (available when the trigger
mode is not EDGE), you can see how often trigger events are detected. This can be
more often than when triggers actually occur, due to the oscilloscope's acquisition
time or update rate capabilities. The TRIG OUT signal shows when triggers
actually occur. Remember that the oscilloscope's trigger circuitry does not re-arm
until the holdoff time occurs (:TRIGger:HOLDoff) and that the minimum holdoff
time is 40 ns; therefore, the maximum trigger qualified event frequency that can be
counted is 25 MHz.
Query Syntax
:COUNter:SOURce?
The :COUNter:SOURce? query returns the currently set counter source channel.
Return Format
<source><NL>
See Also • ":COUNter:CURRent" on page 338
• ":COUNter:ENABle" on page 339
• ":COUNter:MODE" on page 340
• ":COUNter:NDIGits" on page 341
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