SCPI Commands for the Counter
3–66 VX4101A MultiPaq Instrument User Manual
Aperture Characteristics
The aperture is set for all measurement commands except for totalize as follows:
If the optional resolution argument is not specified, then aperture is set to the
default value. If the optional expected value and resolution arguments are not
specified, then the aperture is set to the default value. If both the expected value
and resolution arguments are specified, then the aperture is calculated as follows:
aperture = 10^(–9+log<expected value>–log<resolution>)
with a minimum of 1e–8 and a maximum of 5 seconds. A longer aperture may
be set with the SENSe:APERture command.
The aperture for totalize is 9e6 seconds. An abort must be issued to terminate the
measurement.
CONFigure[1|2|3]([:SCALar]|:ARRay):FREQuency [<array size>[,expected
value>[,<resolution>]]]
This command configures the Counter to measure the frequency of the signal on
the CONFigure suffix input channel. The units of <expected value> and
<resolution> are both Hz.
This command will modify the following:
function - set to FREQuency
aperture - described below
aperture/events mode - set to APERture
if autosetup mode is ON or ONCE, the input channel attenuation, offset,
gain, level and slope can be modified
If neither of the optional arguments are used:
aperture is set to the default value
If only the <expected value> argument is used:
aperture is set to the default value
If both <expected value> and <resolution> are used the aperture is calculated as
follows:
aperture +10(–9)logtexpectedu*logtresolutionu)
with a minimum of 1e–8 and a maximum of 5 seconds. A longer aperture may
be set with the SENSe:FREQuency:APERture command.
CONFigure[1|2|3]([:SCALar]|:ARRay):FREQuency:RATio [<array size>[,expected
value>[,<resolution>]]]
This command configures the Counter to measure the ratio of the frequencies of
the signals on the CONFigure suffix input channel and <second channel>.