5 Triggering and Gating
174 Keysight 53220A/53230A User’s Guide
External gate sources
Gate sources EXTernal, INPut[1], and INPut2 are external sources. EXTernal
is the counter’s rear panel ‘Gate In/Out’ BNC, and INPut[1]/ INPut2
(represented by softkeys Chan 1 and Chan 2) are the counter’s channel 1 and
channel 2 inputs.
External gate signal polarity
When using any external gate source the polarity of the gate signal and therefore,
the duration of the gate, is set or changed with the command:
[SENSe:]FREQuency:GATE:POLarity {POSitive|NEGative}
[SENSe:]FREQuency:GATE:POLarity? (query form)
OUTput:STATe OFF must be set when using gate source EXTernal. See
“Enabling gate signals on the ‘gate in/out’ BNC” for more information and for
information on using gate signals to synchronize other instruments.
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