DH Instruments COMPASS FOR MOLBOX, User Manual

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COMPASS
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for molbox™ User’s Manual
Page 63
© 1998-2003 DH Instruments, Inc .
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8.1 OVERVIEW
COMPASS is organized around the support and testing of Devices Under Test (DUTs). DUTs are defined
in DUT Definitions. The information contained in the DUT Definition determines which System
Configuration devices are required (see Section 10.2) for the
COMPASS run modes. DUT Definitions not
only specify the relationship between set point, output and flow; they determine how this data will be
acquired. Some DUTs can output directly using an RS-232 or IEEE-488 interface while others require a
DMM or a manual entry to log their output. Some DUTs are sensitive to the density of the flowing gas so
that gas density corrections must be made to properly evaluate them. There are DUT’s that control flow
and others that measure only. The DUT Definition supports all the necessary features to properly set up a
very wide variety of DUTs.
There are two types of DUT Definitions specified in the DUT [Header] tab (see Section 8.5.2):
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Individual DUT Definitions are intended to define a specific, individual DUT. They include a unique
DUT serial number and identification value. This type of DUT Definition does not require new entries
during test initialization (see Section 7.2.1.5).
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DUT Profile Definitions are intended to define a general DUT type. They do not include serial
number and identification values. DUT profiles are useful when several DUTs of the same type will be
tested. Instead of creating multiple DUTs all differing by serial number and/or identification only, use a
DUT profile. This type of DUT Definition requires that the DUT be identified during test initialization
(see Section 7.2.1.5).
Access the DUT Definition Editor using the [Setup], [DUT] menu option. When selected, the last
accessed DUT Definition displays in the DUT Definition Editor. While in the Editor, use the toolbar options
to create, edit, view and delete DUTs (see Section 8.5.1).
Only one DUT can be edited at a time, however, other DUTs can be viewed prior to completing the
changes on the DUT being edited. The DUT scroll bar and the DUT Selector are available to make new
DUT selections. A flashing indicator displays the ID number of the DUT currently being edited. This ID will
change as the DUT sort order changes. The edited DUT always displays in blue text in the DUT Selector
(see Section 8.4). Use these editing signals to locate the DUT if necessary.
DUT Definitions can be edited only when COMPASS is not in an active run mode. If a run mode is active,
all DUT fields and selection functions are disabled.