COMPASS
for molbox™ User’s Manual
Page 89
© 1998-2003
DH Instruments, Inc
.
FEATURE
DESCRIPTION
Tare molbox
(required drop
down list
selection)
Use the drop down list to select the flow points at which the molbox pressure
transducers should be tared (see the molbox Operation and Maintenance
Manual,
[Tare]
Section). The tare occurs after completion of the stability test.
After taring, stability is rechecked before continuing with the next test step. Use
the Test Definition
[Tare]
tab to determine the tare pressure and how the tare
will be activated (see Section 9.5.5). There are 3 choices:
•
Selected points:
Uses the tare points manually inserted into the sequence
using the
<Points>
table
<Insert>
option (see Section 9.5.2).
•
First point:
Automatically adds a tare at the first test point. The
<Points>
table
<Insert>
option is not active when this choice is selected.
•
All points:
Automatically inserts a tare at every test point in the test point
table. When new points are added, they automatically receive a tare when
this choice is selected. The
<Points>
table
<Insert>
option is not active
when this choice is selected.
Dwell
(required entry
field and drop
down list
selection)
Dwell is a pause that occurs following stability testing, prior to taking averaged
test data at each flow point. When
<Dwell>
is set to
<Timed>
,
COMPASS
dwells at each test point for the specified
<Dwell Time>
, 0 – 999s. When
<Dwell>
is set to
<Manual>
,
COMPASS
dwells at each test point until
<OK>
is
clicked on the
<Continue Test>
pop-up. This feature can be used to
synchronize readings or to pause operation during flow setting, for example to
make adjustments to the DUT.
Averaging
Time(s)
(required entry
field and drop
down list
selection)
Determines a fixed or user selectable time over which reference and DUT
readings are averaged when taking data at each flow point. When
<Timed>
is
specified,
COMPASS
averages for the fixed
<Averaging Time>
entered,
0-999s.
<Manual>
averaging allows either a fixed time or user selectable
starting and stopping at each point. Averaging only occurs when reference and
DUT output readings can be taken remotely. As many readings as possible are
taken during the averaging period. The time value must be between 0 and 999s.
Readings/point
(required entry
field)
The number of repeated, independent averages taken at each point. Points are
not reset or re-tested for stability between averages. Leave this value at one unless
you want more than one complete, averaged data values at each flow point.
Number of Test
Cycles
(required entry
field)
COMPASS
can run up to 10 test cycles in one test. A test cycle includes setting
and taking data at each of the flow points in the
<Points>
table. When more than one
test cycle is specified, system leak testing and purging occurs only at the beginning
of the first cycle. Data from multiple cycles is included in a single Data File.
9.5.5 [TARE]
TAB
The Test Definition
[Tare]
tab is used to specify how a new tare value should be activated
and whether to tare at the molbloc upstream or downstream pressure. The flow points at
which the molbox should be tared are specified in the
<Points>
Table (see Section 9.5.2).
Taring is only applicable when a molbox is set up as the flow reference and it is set up to
communicate remotely. See the molbox Operation and Maintenance Manual,
[Tare]
Section,
for complete information and recommendations on taring molboxes. Taring at every flow
point yields the best data and should be considered if test execution time is not an issue.
The purpose of the
[Tare]
tab’s fields and settings as well as instructions on how to use them
are provided in Table 28.
Summary of Contents for COMPASS FOR MOLBOX
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