DH Instruments COMPASS FOR MOLBOX, Руководство пользователя

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COMPASS

for molbox™ User’s Manual
© 1998-2003 DH Instruments, Inc .
Page 187
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19.1 OVERVIEW
COMPASS operation includes many internal calculations. Most of these calculations are related to
analyzing the data taken during a test run. The internal calculations performed by COMPASS are
documented in the sections that follow. The calculations have been verified both by comparison of the
program code content to the defined formulas and by parallel manual calculation.
19.2 DUT FLOW
The DUT flow is the DUT output converted to the DUT flow unit.
The DUT flow is calculated by first determining the percentage of the current output value relative to the
DUT output span and then applying this percentage to the DUT flow span (see Sections 8.5.4, 8.5.8 for
information on DUT output and flow spans). This calculation is used regardless of the state of the DUT’s
<Density Correction> selection (see Section 8.5.3). The density correction is applied to the reference
flow (see Section 19.5).
span
current
O
O O
D
min
%
−
=
min %
Q Q D Q
span DUT
+
× =
VARIABLE DESCRIPTION
D
%
Proportion of the DUT span output based on the measured
DUT output.
O
current
Current DUT output value.
O
min
DUT minimum output defined by the DUT Definition.
span
O
DUT output span as determined by the difference between the
maximum and minimum outputs in the DUT Definition.
Q
span
DUT flow range span as determined by the difference between the
maximum and minimum flow output values in the DUT Definition.
Q
min
DUT minimum flow output defined in the DUT Definition.
Q
DUT
Calculated DUT flow in the DUT’s flow range units.