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Calculate Subsystem
The calculate subsystem processes the
measuring results. Here you can recalcu
-
late the result using mathematics, make
statistics (not PM6685) and set upper and
lower limits for the measuing result that
the counter itself monitors and alerts you
when the limits are exceeded.
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Mathematics
The mathematic functions are the same as
on the front panel.
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Statistics
The PM6680B and PM6681 can calculate
and display the MIN, MAX, MEAN and
standard deviation of a given number of
samples. The statistic functions are the
same as on the front panel.
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Limit Monitoring
Limit monitoring makes it is possible to
get a service request when the measure
-
ment value falls below a lower limit or
rises above an upper limit. Two status
bits are defined to support limit monitor-
ing. One is set when the results are
greater than the UPPer limit, the other is
set when the result is less than the
LOWer limit. The bits are enabled using
the standard *SRE command and
:STAT:DREG0:ENAB. Using both these
bits, it is possible to get a service request
when a value passes out of a band (
UPPer is set at the upper band border and
LOWer at the lower border) OR when a
measurement value enters a band
(LOWer set at the upper band border and
UPPer set at the lower border).
Turning the limit monitoring calculations
on/off will not influence the status regis
-
ter mask bits which determine whether or
not a service request will be generated
when a limit is reached. Note that the cal
-
culate subsystem is automatically enabled
when limit monitoring is switched on.
This means that other enabled calculate
sub-blocks are indirectly switched on.
Using the Subsystems
Calculate Subsystem 6-3