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COMPASS
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for molbox™ User’s Manual
© 1998-2003 DH Instruments, Inc .
Page 140
12.4.1 PLOT TYPES
From the [Plots] button, eleven predefined plot types can be selected. Each new plot selection
automatically generates the selected plot in accordance with the current <Plot Properties>
(see Section 12.4.2). Depending on the selected properties, the plots may include tolerance
bars or the results of a best fit straight line fit may be applied to the test data.
The selection of plot type is accessed by clicking on the icon while viewing a plot.
The current plot choice is indicated by a check mark by that menu item. The plot types available
are described in Table 51. See Section 19.4 for information on calculation of the errors that are plotted.
Table 51. Data Plot Types
PLOT TYPE DESCRIPTION
Reference Flow vs.
DUT Flow
The reference flow in the DUT’s flow units is plotted against the DUT flow in
the same flow unit. If there is perfect agreement between the DUT and the
reference, this plot is a straight line starting at origin with a slope of 1.
DUT Output vs.
Reference Flow
The DUT output in the DUT’s output units is plotted against the reference
flow in the DUT’s flow units. This plot is used to get quick visual
representation of the DUT output to flow relationship.
Reference Flow vs.
DUT Output
The reference flow in the DUT’s flow units is plotted against the DUT output
in the DUT’s output units. This plot is the inverse of the
DUT Output vs.
Reference Flow plot option. This plot is used to get quick visual
representation of the flow to DUT output relationship.
% DUTFS Error vs.
Reference Flow
The DUT error as a percent of full scale at each flow point is plotted against
the reference flow.
%Reading Error vs.
Reference Flow
The DUT error as a percent of reading at each flow point is plotted against
the reference flow.
DUT Flow vs.
Points
The DUT flow is plotted against each test point taken. This type of plot is
typically used when the Data File specifies multiple readings/point.
Reference Flow vs.
Points
The reference flow is plotted against each test point taken. This type of plot
is typically used when the Data File specifies multiple readings/point.
%DUTFS vs. Points The DUT full scale error is plotted against each test point taken. This type
of plot is typically used when the Data File specifies multiple readings/point.
Reference Flow vs.
Set Point
The reference flow is plotted against the DUT set point. When the Data File
contains measured set point data (if the DUT is a controller), the measured
value is used as the set point. Otherwise, the nominal set point is used.
This plot is used to evaluate how close to the target flow the reference flow
was actually set at each flow point.
%DUTFS Set Error
vs. Reference Flow
The full scale set point error is plotted against the reference flow at each
flow point. When the Data File contains measured set point data (if the DUT is
a controller), the measured value is used. Otherwise, the nominal set point is
used.
%Reading Set Error
vs. Reference Flow
The percent of reading set point error is plotted against the reference flow at
each flow point. When the Data File contains measured set point data (if
the DUT is a controller), the measured value is used. Otherwise, the
nominal set point is used.
Custom Plots All custom plots created using the <Custom Plots> option (see
Section 12.4.2.4) are listed at the bottom of the list of plots. Selecting any
of these plots is the same as selecting a built in plot. The only difference is
the data plotted.