Vega DSGH, Руководство по эксплуатации

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DSGH Installation and Operation Guide 57
Advanced functions
Percent Count Range The compensated measurement counts that express
as a percent of the counts at the high and low-
endpoints of the calibration (determined with the two
point initial calibration.) This quantity shows where the
current measurement is in relation to the total count
range.
% count range = 100 x (C
L
- C
S
) / (C
L
- C
H
)
where
C
S
= sum counts
C
L
,C
H
= counts at Cal Low density and Cal High
density
C
L
-C
H
= counts range
Percent Process Span The measurement value as a percent of the
measurement span. Enter the maximum and minimum
density values in the Setup tab.
A graph of percent count range vs. percent process
span indicates the non-linearity of the radiation
transmission’s measurement. If using a table linearizer,
the values in the table are percent count range and
percent process span.
Unfiltered PV The density in inches without the time constant or
rectangular window filter.
Uncompensated PV The density of process before any process
compensation.
Final PV The process value in engineering units after applying
the filter.This value relates to the current loop output.
Aux Counts The frequency-input counts from optional auxiliary
input.
Filtered Aux Counts The filtered auxiliary counts. Enter the filter dampening
value for the auxiliary input’s filter time-constant.
Table 4.1
Process Chain tab — display values (continued)
Value Description