HP 53181A Programming Manual page 163

Commands Reference
:CALCulate Subsystems
:CALCulate Subsystems
Three :CALCulate subsystems (:CALCulate[1], :CALCulate2, and :CALCulate3)
perform post-acquisition data processing and data transfer of the corresponding
results. Functions in the SENSe subsystem are related to data acquisition, while the
:CALCulate systems operate on the data acquired by a SENSe function as shown in
Figure 4-1.
The :CALCulate subsystems are logically between the :SENSe subsystem and the
data output to either the bus or display. When a measurement is initiated (by a
:MEASure, :READ, or an :INITiate command), the :SENSe subsystem collects data.
This data is transformed by :CALCulate[1|2|3], as specified, and then passed on to
the selected output. In effect, the collection of new data "initiates" the :CALCulate
subsystems. The :CALCulate subsystems may also be directed by command to
transform, making it possible to change the configuration of :CALCulate and
consequently derive a different set of results from the same SENSe data set without
re-acquiring SENSe data.
Calculated results are available (valid) until new results are computed or until
relevant instrument state is changed.
The :CALCulate3 subsystem consists of two sub-blocks as shown in Figure 4-1. The
data flows through the sub-blocks in a serial fashion. The manner in which these
sub-blocks are arranged is specified in the :CALC3:PATH? query.
The :CALCulate[1|2|3] settings are not used when measuring Voltage Peaks
(voltage minimum, maximum, or peak-to-peak).
Not until :CALCulate[1]:MATH:STATe is set to ON will any of the :CALCulate[1]
NOTE
settings or :TRACe[:DATA] settings be used.
Not until :CALCulate2:LIMit:STATe is set to ON will any of the :CALCulate2
settings be used.
Not until :CALCulate3:LFILter:STATe is set to ON will any of the
:CALCulate3:LFILter settings be used.
Not until :CALCulate3:AVERage:STATe is set to ON will any of the
:CALCulate3:AVERage settings be used.
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