Download COMPASS® for molbox™ Flow Calibration Software

COMPASS for molbox™ User’s Manual
SYMPTOM
When flow regulation is
active, the reference flow
oscillates significantly around
the target flow.
PROBABLE CAUSE
•
The flow regulation time is too
small.
•
The gas supply is running out
causing faulty control.
•
The target flow is not within the
resolution of the flow controller.
SOLUTION
Make sure the gas supply is
sufficient for the current test and
that the flow controller has the
proper performance.
Use the
[Setup], [Test] [Control] tab to
change the regulation limit in the
test. 9.5.6.
I chose a new reference (or
other
device)
on
the
[Reference] tab of the
Hardware
Definition
and
COMPASS still tried to use
the previous reference when I
ran a test.
All tabs in the Hardware Definition are
displays of available selections. A
selection on any of these tabs updates
the display only.
Only the System Configuration is
used to make a selection of
hardware to be used by COMPASS.
The
desired
IEEE-488
card,
reference, DMM, etc. should all be
selected
in
the
System
Configuration. 10.2.
The flow output of my molbox
is changing erratically in
COMPASS yet my flow is
stable.
•
Interface is not properly buffered
by the operating system.
•
The RS-232 cable is not properly
grounded.
•
The PC’s RS-232 port is going
bad.
This issue is typically associated
with the Windows NT operating
systems. If this is the case, open
Control Panel then select Ports.
Select the effected RS-232 port
from the list then choose Settings.
Change the state of the FIFO
Enabled option at the bottom of the
Settings display.
Check the RS-232 cable to make
sure that all pins are properly
connected.
Especially pin 5
(ground).
However rare, RS-232 do go bad.
This problem is associated with
intermittent communications. Verify
that other RS-232 devices function
properly while being continuously
polled.
A report displays $... instead
of an expected piece of Data
File.
The report template in use has a
corrupted field.
Edit the report template and
re-insert the desired field using the
[Field Insertion Tool]. 16.3.1.3,
16.3.3.2.
I cannot edit a selected DUT
or Test Definition during the
initialization of a test.
COMPASS displays test and DUT
Definitions in their respective Editors for
viewing purposes only during test
initialization and while a test is running.
Edit DUTs and tests using [Setup],
[DUT] and [Setup], [Test], while
COMPASS is idle. 7.1, 8.5, 9.5.
The test Data File appears in
the COMPASS root directory
as opposed to a directory
based on the DUT serial
number or identification.
•
An invalid character appears in the
DUT serial number or ID field: /, \,
?, :, *, <, >, |, or “. These
characters cannot be used in file or
directory naming in Windows.
•
The target directory for Data Files
has restricted access or does not
exist. COMPASS always defaults
to the root directory without
generating an error when trying to
create test Data Files.
Use the DUT Definition Editor to
remove any invalid characters in the
DUT Definition serial number or ID
field. Make sure these characters
are not entered during the <Setup
DUT(s)> step of test initialization.
8.5.2, 7.2.1.5.
© 1998-2003 DH Instruments, Inc.
Page 204
Use Windows Explorer to verify the
Data File directory selection on
[Tools], [Options], [Data File] tab
is valid. 11.8.