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:COUNter Commands 11

Keysight InfiniiVision 3000T X-Series Oscilloscopes Programmer's Guide 293

:COUNter:SOURce

(see page 1276)

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

See Also • ":COUNter:CURRent" on page 289

• ":COUNter:ENABle" on page 290

• ":COUNter:MODE" on page 291

• ":COUNter:NDIGits" on page 292

Keysight Technologies InfiniiVision 3000T X Series User Manual

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