DH Instruments COMPASS FOR MOLBOX, User Manual

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COMPASS

for molbox™ User’s Manual
© 1998-2003 DH Instruments, Inc .
Page 52
Select Test (see Section 7.2.1.4): The test selection tool is presented identifying the
Test Definition associated with the DUT selected in Step . A different Test Definition can be
selected or viewed at this point. If this step is turned OFF, the screen is not shown and the
Test Definition associated with the DUT is automatically selected. If the DUT Definition does
not specify a valid Test Definition, this step must be completed regardless of the initialize options.
Re-select DUT interface settings (see Section 7.2.1.5): When applicable, the DUT
ID/Interface screen is presented with the default interface parameters for the DUT.
Select new settings or accept the default values. If the DUT Definition is a DUT profile
(see Section 8.5.2), the extra step of entering the DUT’s serial number and/or
identification is required. If this step is turned OFF and the DUT Definition is not a DUT profile,
this screen does not display. The screen is automatically skipped if neither RS-232 nor IEEE-488
interfaces are set up for DUT set or read modes and the DUT Definition is not a DUT profile.
User ID Entry (see Section 7.2.1.6): The user ID entry screen is presented. The last
user ID can be accepted, a new user ID may be entered, or a previously entered user ID
may be selected from the user ID drop down list. If this step is turned OFF, the screen is
not shown and the last user ID selected is automatically used.
Test initialization is complete, run test begins (see Section 7.2.2).
7.2.1.1 INITIALIZE molbloc/molbox
When any model molbox is specified as the reference in the System
Configuration (see Section 10.2), test initialization always begins by loading the
molbloc into memory and determining which features are available. Depending
on the molbox model and the type of interface used, this step may take several
seconds. No user interaction is required while this step is in progress.
COMPASS uses the information loaded to check for conflicts and range issues
that may exist with the DUT Definition subsequently selected. Error messages
are displayed if configuration conflicts or remote communication errors exist.
Common examples are an RS-232 time-out which can occur if the molbox is not
connected to the PC by an RS-232 cable. If the System Configuration specifies
the
<Reference molbox> as the <Set Point Power Supply> and the molbox
does not have an analog option, an error will also occur.
The molbox front panel display flow unit of measure is set up during this
initialization step. The unit can be changed using the
[Tools] , [Options] ,
[molbox] tab (see Section 11.2). If for any reason, the unit is changed after this
initialization step, COMPASS will not be able to properly determine the reference flow.
Erroneous data will be logged if the reference molbox flow, pressure or
temperature units are modified after the initialize molbloc/molbox test
initialization step. COMPASS expects the units of measure to remain
constant once the system is initialized.
7.2.1.2 SELECT STARTING molbloc CHANNEL
molbox1 models with two molbloc channels have an option to select the starting
molbloc channel during the test initialization. When this feature is turned ON
(see Section 11.2) and there are two molblocs connected to the molbox, the molbloc
channel selector displays. Select the starting molbloc channel by clicking the
A ,
B or A+B buttons. Close the channel selector panel to abort the test.