DH Instruments COMPASS FOR MOLBOX, Руководство пользователя

Страница: 57 / 226

COMPASS

for molbox™ User’s Manual
Page 43
© 1998-2003 DH Instruments, Inc .
Table 9. <DUT/Reference Comparison> Run Screen Fields
LABEL DESCRIPTION
Red or Green
Circular Indicator
molbox flow Ready/Not Ready indicator (see the molbox Operation and Maintenance
Manual, Ready/Not Ready Section). The circle is green when molbox flow is ready
and red when not ready.
Red or Green Square
Indicator
DUT in or out of tolerance indication. The square is green only when the instantaneous
flow error is within the tolerance specified in the DUT Definition (see Section 8.5.5).
Reference
Reference flow converted from the molbox display units to the current
<DUT/Reference Comparison> run screen units. If the DUT Definition specifies a
density correction (see Section 8.5.3), the reference flow value is the reference flow
corrected for the DUT normal operating conditions (“Ref Flow DUT Cond” in the Data Grid).
This allows the reference flow to represent the flow that would be present if the DUT
were at its normal operating conditions. Put another way, reference flow corrected for the
DUT normal operating conditions is what the DUT would indicate if it agreed perfectly with
the reference. To change the display unit of measure, click the value and select the
desired unit from the list.
DUT The DUT flow converted to the current flow display units. When a manual entry DUT
is used, the last output entry value displays until a new entry is made. The errors are
therefore meaningless between entries. To change the display unit of measure, click
the value and select the desired unit from the list.
Error (%Rdg)
DUT percent of reading error (see Section 19.4).
Error (%DUTFS) DUT percent of full scale error (see Section 19.4).
Set Error (%Rdg) DUT percent of reading set point error. If the measured set point is not available, the
nominal value is used (see Section 19.3).
Set Error (%DUTFS)
DUT percent of full scale set point error. If the measured set point is not available, the
nominal value is used (see Section 19.3).
6.7.2 molbox OUTPUT RUN SCREEN
If a molbox is set up as the active flow reference, the <molbox output> run screen is an
available choice. The run screen displays a real time update of molbox output information.
The information in this run screen is direct from the molbox with no manipulation or
calculations applied. In fact, no DUT specific information displays in this Run Screen.
The
<molbox Output> run screen can be very useful for troubleshooting.
In [Run molbox] mode, the <molbox Output> run screen displays flow in the unit of measure
selected on the <Units> panel. In all other run modes, this flow is in the current molbox output unit.
Table 10 provides information on each field of the <molbox Output> run screen.
Always use the COMPASS <molbox Output> run screen instead of the molbox front panel
to view real time molbox output information. This display updates the raw output information
from the molbox in [Run DUT] and [Run Test] modes. In [Run molbox] mode, the current
unit of measure selected on the <Control Toolbar> is displayed instead of the raw values.
When a molblocS does not have a valid back pressure ratio (BPR), the displayed flor is N/A.