168 53220A/53230A User’s Guide
5 Triggering and Gating
For external sources INPut[1] and INPut2 (Chan 1 and Chan 2 softkeys), a
fixed input threshold voltage must be specified in addition to the gate signal
polarity. These parameters are set with the commands:
INPut[{1|2}]:LEVel[{1|2}][:ABSolute]{<volts>|MINimum|
MAXimum|DEFault}
INPut[{1|2}]:LEVel[{1|2}][:ABSolute]?[{MINimum|MAXimum|
DEFault}] (query form)
The specified edge (polarity) of the gate signal crossing the threshold opens
the gate. The opposite edge (polarity) of the signal crossing the threshold
closes the gate.
When using sources INPut[1] and INPut2, the channel selected as the gate
source cannot be the same channel on which input events are totalized. That
is, the gate source channel cannot be involved with the measurement.
To set the polarity and level when using an input channel as the gate source:
// select the gate polarity, source, and threshold level
CONF:TOT:TIM
SENS:TOT:GATE:POL POS // set polarity
SENS:TOT:GATE:SOUR INP1 // set source - channel 1
INP1:LEV 4 // set threshold - 4V
Gate Source ADVanced
Gate source ADVanced enables extended control of the gate signal through the
counter’s SENSe:GATE commands (see Advanced Gate Control).
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