DH Instruments COMPASS FOR MOLBOX, Руководство пользователя

Страница: 137 / 226

COMPASS

for molbox™ User’s Manual
Page 123
© 1998-2003 DH Instruments, Inc .
FEATURE DESCRIPTION
Test molbox
change mode
(drop down list
box)
A molbloc change inserted into a Test Definition can occur in one of 3 ways:
•
prompt for change - A user prompt displays to change the mobloc. It is up to
the user to make all necessary electrical and pneumatic connections prior to
responding to the prompt. This may involve simply changing the active molbloc
channel or re-connecting a new molbloc.
•
toggle active channle - When a 2 channel molbox is the flow reference, the
active molbloc channel is automatically switched; A to B or B to A. No prompt is
provided. Using this option and a Test Definition valve driver change, a fully
automated two molbloc test can be executed. If the reference is not a 1 channel
molbox, a prompt to change the molbloc is displayed. Prior to running the test,
the flow hardware must be setup such that the 2 reference molblocs are on
channels A and B of the reference molbox. An electric valve(s) should be used to
isolate the moblocs. The required valve state to expose a new molbloc and
isolate a molbloc should be added to the Test Definition along with a molbloc
change.
•
delay and re-load - Use this option only when the ability to automatically change
a molbloc with external software and/or hardware is available. When selected, a
20s delay occurs then the active channel molbloc is re-loaded.
COMPASS will
display a warning if the serial number of the new molbloc is the same as the serial
number of the original molbloc.
Apply water ratio
(drop down list
box)
The water ratio selection effects the flow of sonic nozzles only when Air is used as
the calibration gas. In all other situations, the water ratio selection is ignored. Refer
to the molbox operation and maintenance manual for details on the water ratio. The
choices are:
•
Set to 0 - COMPASS automatically sets the water ratio in the molbox to 0. This
option is recommended only if a water ratio value is not used in the molbox.
•
Use active molbox value - The water ratio value in the molbox is used.
COMPASS does not change this value.
•
Prompt for new value - The <Calculate Water Ratio> form displays and allows
a new water ration to be determined based on the entered ambient pressure,
ambient temperature and ambient humidity.
Sonic nozzle
leak rate limt
(%P Start)
(numeric entry)
The value entered represents the leak rate limit of a molblocS based leak test.
The number represents the maximum percentage change in the starting upstream
molbloc pressure over the 60s leak test interval. A leak test executed with a
reference other than a molblocS ignores this selection.
Default absolute
pressure unit
(drop down list
box)
Determines the molbox pressure unit of measure to use in [Run DUT] and [Run
Test] run modes when the DUT does not require a density correction (see Section
8.5.3). If the DUT does use a density correction, the molbox pressure unit is set to
the DUT’s normal operating pressure unit.
Default
temperature unit
(drop down list
box)
Determines the molbox temperature unit of measure to use in [Run DUT] and [Run
Test] modes when the DUT does not require a density correction (see Section
8.5.3). If the DUT does use a density correction, the molbox temperature unit is set
to the DUT’s normal operating temperature unit.