DH Instruments COMPASS FOR MOLBOX, User Manual

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COMPASS

for molbox™ User’s Manual
Page 203
© 1998-2003 DH Instruments, Inc .
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20.1 OVERVIEW
COMPASS for molbox is a sophisticated software package with many advanced features with the
potential to be misused and/or misunderstood. Check the HOW DO I? section for an explanation on how
to properly use
COMPASS for several common applications as well as quick tips on how to use many
features. Before assuming that unexpected behavior is caused by a software or hardware defect, the
operator should use this manual in conjunction with the documentation on other instruments used with
COMPASS to troubleshoot and identify normal behavior. The following section contains suggestions and
solutions to resolve many commonly encountered issues. Identify the unexpected behavior from the
symptoms list in Table 71. A Probable Cause and Solution are proposed including cross references to
sections in this manual that may be of assistance.
Table 71. Troubleshooting
SYMPTOM PROBABLE CAUSE SOLUTION
The test report logs N/A as
the hysteresis value. Identical ascending and descending
points were not used in the Test
Definition. Define a test that has identical
ascending and descending test
points. 19.9, 9.5.2.
A test runs but all DUT flow
and/or output values are 0.00
or another unexpected value.
•
The DUT <Read Command> or
<Leading characters to strip>
entry is incorrect when the DUT
data acquisition is RS-232 or IEEE-
488.
•
The DMM <Read Command> or
<Leading characters to strip>
entry is incorrect when the DUT
data acquisition in
<Voltage/Current> .
Use [Tools] , [Remote
Communications] to send discrete
commands to verify the command
being used by the DUT or DMM,
then make the appropriate edits to
the DUT or DMM setup. Refer to
the documentation of the data
acquisition instrument for command
details. 10.3.4, 13.3, 13.2.5.1.
A COMPASS time-out occurs
when reading a device during
test initialization. This can
occur when using any
supported device.
•
The device interface is not properly
set up.
•
The RS-232 or IEEE-488 interface
cable is not secure.
•
A device command is used that
does not respond.
•
The device power is not ON.
Always make sure a device is
powered ON and has the remote
interface securely attached prior to
use. The remote interface settings
of all supported devices can be
adjusted in their respective setups.
Make sure that the
<No Response>
button is checked when any remote
command is issued that does not
respond. 13.1, 13.3.
When using a molbox
reference to run a test, the
reference Ready indicator is
always red though the flow
appears very stable. The %DUTspan Test Definition stability
limit is in the test results in a stability
limit that is too small for the current
setup. Use the [Setup] , [Test] ,
[Sequence] tab to change the
stability limit in the test. 9.5.4.