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SCPI Commands for the Counter
VX4101A MultiPaq Instrument User Manual
3–81
N/A
The following summarizes the INPut commands:
INPut[1|2]:ATTenuation <attenuation>|DEFault|MINimum|MAXimum
This command sets the input block signal attenuator for the specified channel.
If <attenuation> is less than 2, the attenuator is set to 1. If <attenuation> is
between 2 and 20, the attenuator is set to 10. If <attenuation> is greater than 20,
the attenuator is set to 100.
INPut[1|2]:COMParator[1|2]:LEVel[:ABSolute] <absolute level>|DEFault|MINi-
mum|MAXimum
This command sets the threshold level for the input channel and comparator
selected. The units are volts.
DEFault = 0
MINimum = –0.5
MAXimum = 0.5
To calculate what a particular input voltage will be at the comparator, the
following equation may be used:
VL = S*G*(VO + VI/A)
where
VL = voltage at the comparator
S = 1 for positive slope, –1 for negative slope
G = gain setting
VO = offset voltage
VI = input voltage
A = attenuator setting
INPut[1|2]:COMParator[1|2]:LEVel:RELative <relative level>
This command sets the comparator threshold level voltage of the channel and
comparator selected. This value will be used at INITiate time to set the compara-
tor level to a voltage that is the same as if the voltage was fed to the input. This
compensates for attenuation, offset and gain settings. The unit for <relative
level> is V. The comparator level hardware will be set when the measurement is
INITiated. The following formula will be used:
VL = S*G*(VLR/A + VO)
Related Commands
Command Description