6. FPG TOOLS
Page 69
© 2007 DH Instruments, a Fluke Company
6.6.2
[SYSTEM SETUP]
This option displays the system setup screen to allow several different types of
configuration changes. Click the folder with the label that represents the desired change then
make the necessary edits. When all changes are complete, press
<Save>
to activate the
changes and return to the main program. Press
<Close>
to ignore the changes and return to
the main program.
6.6.2.1
<SETUP>
The
<Setup>
folder defines how FPG Tools will interact with support system
devices, what automatic features are enabled and lists program constants that
effect overall system metrology. Special care should be taken to ensure that any
value entered is in the proper units with the correct sign.
Figure 29. <System Setup><Setup>
Tab
Table 16. <System Setup><Setup>
Options
LABEL
DESCRIPTION
Local Gravity
(entry field)
The gravity determined at the test location of the FPG. This value is used
when determining the new calibration coefficient after an internal calibration
is performed (see Section 11.3.5.4).
Vacuum
Reference Adder
(Pa)
(entry field)
The pressure adder in Pascal to apply to the output of the vacuum reference
device. The value is obtained by pulling vacuum with a turbo pump to
achieve a true zero. The output of the device under this condition is the
zero offset (see Section 8.3).
Vacuum
Reference
multiplier
(entry field)
The pressure multiplier to apply to the output of the vacuum reference
device. The value is obtained by performing a calibration with the device
and the FPG.
Lubrication Gas
(drop down list)
This is the gas used to lubricate the FPG piston cylinder. Select the gas
that will be connected to the “Drive Air” port on the back of the FPG. The
gas must be known to properly determine changes in buoyancy on the
system.
“Air” is the recommended lubrication gas selection. Using Air prevents the
need to purge the system prior to use and avoids a gas mixture in the test
port of the FPG. If “N2” is selected, the FPG must be thoroughly purged of
all traces of Air.
Failure to properly purge when N2 is used can result in short
term pressure instability and faulty pressure measurements.
