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SCPI Commands for the Counter
VX4101A MultiPaq Instrument User Manual
3–99
NOTE. Time Interval With Delay, Phase, and Duty Cycle use all available
hardware timers. When the counter is in one of these modes, the aperture is
controlled by software and has a minimum period of approximately 10 ms.
MEASure[1|2|10|20][:SCALar]:TOTalize?
This query performs a totalize measurement. The counter totalizes two selected
channels simultaneously. Channels 1 and 2 are selected by either 1 or 2. Channel
one and the 1 GHz VCO are selected by 10. Channel two and the 1 GHz VCO
are selected by 20. Selecting either channel one or 2 and the VCO provides an
elapsed time in nanoseconds after the totalized results for the selected channel.
This measurement is unique. It allows you to fetch the totals while it is still
counting. Each fetch will return updated count values. This command has a
default aperture of 99 days. Use the ABORt command to end this measurement.
Since this measurement allows reading the Counter hardware while it is
counting, there is some risk that the value returned will be in error.
If the optional <expected value> and <resolution> arguments are not 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:RTIMe:APERture command.
MEASure[1|2]([:SCALar]|:ARRay)[:VOLTage][:...]? [<array size>[,<expected
value>[,<resolution>]]]
These queries configure the Counter to measure the voltage on the MEASure
suffix input channel. The measurement is initiated and the result placed in the
output buffer. The <expected value> and <resolution> parameters are accepted
but ignored.
The maximum and minimum voltage of the input signal are determined
assuming either a DC signal or a repetitive signal with a frequency of at least
1000 Hz. The user must select the proper INPut:COUPling and INPut:IMPed-
ance separately. The voltage measurements are calculated as follows:
AC = (maximum – minimum) / 2.828
DC = (maximum + minimum) / 2