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SCPI Commands for the Counter
VX4101A MultiPaq Instrument User Manual
3–95
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 five seconds. A longer aperture may
be set with the SENSe:FREQuency:APERture command.
MEASure[1|2|3]([:SCALar]|:ARRay):FREQuency:RATio? [<array size>[,<second
channel>[,<expected value>[<resolution>]]]]
This query configures the Counter to measure the ratio of the frequencies of the
signals on the MEASure suffix input channel and <second channel>. The
measurement is initiated and the result placed in the output buffer. Ratio,
<expected value>, and <resolution> have no units. The parameters <expected
value> and <resolution> are accepted but are not used.
This command will modify the following:
function - set to FREQ:RAT
aperture - set to default
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.
The SENSe suffix selects the input channel for the numerator. The <second
channel> selects the input channel for the denominator. Ratios of a channel to
itself are always one and the Counter will generate an error if programmed to do
it. The <second channel> can be 1, 2 or 3. When channel 3 is not being used and
the Counter mode is EVENts, the SENSe suffix channel will be used as the input
to the EVENts Counter. In the case where input channel 3 is used and the
Counter mode is EVENts, the other specified input channel will be used as the
input to the EVENts Counter.
MEASure[1|2|3]([:SCALar]|:ARRay):PERiod? [<array size[,expected value>[,resolu-
tion>]]]
Configures the Counter to measure the period of the signal on the MEASure
suffix input channel. The measurement is initiated and the result placed in the
output buffer. The units of <expected value> and <resolution> are seconds.
This command will modify the following:
function - set to PERiod
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