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Pressure
Calibrator
Interface
Unit
USB
Port
9-Pin to
USB
Connector
Line Power
Pressure Module
Zero Pressures
In verification and calibration, these instructions refer to a
zero pressure.
In verification, for standard (positive-only reading), vacuum,
or dual-range modules this is equivalent to venting to the
atmosphere. For absolute modules, it is best to apply a
known vacuum pressure as low as possible, but any precisely
known pressure will work.
In calibration, for standard (positive-only reading) and vacuum
modules, the module or pressure calibrator should be vented
to atmosphere. For absolute modules, a known vacuum must
be applied. For dual or compound-range modules, a negative
pressure should be applied that is close to the negative full
span.
As Found Verification
Proceed as follows to collect verification data for the module
before you adjust it. Before you verify the module, exercise it
by applying full scale pressure, then venting to atmosphere.
As found data is saved in a file named “nnnnnnn.fnd,” where
“nnnnnnn” is the serial number of the pressure module. You
can import this file into a database or spreadsheet program.
1. Click on As Found Verification.
2. Apply each requested pressure. Where a zero pressure
is called for, refer to Zero Pressures above.
Wait for the reading to settle (to typically less than 1
count change in 5 seconds) before you go on to each
next step.
3. Click on Done to save the data to a text file.
If Verification Fails by More than 1%
If the pressure module is more than 1% out of tolerance, it
needs full calibration over temperature at a Fluke Service
Center, and possibly repair. Check for tolerance exceeding
1% of full scale by comparing the results of As Found
Verification with the pressure module specifications.
Calibration Adjustment
Using the calibration adjustment procedure, you create new
calibration coefficients and download them into the pressure
module. Before you calibrate the module, exercise it by
applying full scale pressure, then venting to atmosphere.
Proceed as follows to adjust a module:
1. Click on Calibration Adjustment.
2. Apply a zero pressure (refer to Zero Pressures above).
Wait for the reading to settle (to typically less than 1
count change in 5 seconds) before you go on to the next
step.
3. Apply full scale pressure ±5% as requested by the
program. Again, wait for the reading to settle.
4. Test the module by applying any pressure between zero
and full scale. The module is now working with the
updated constants.
5. In cases where the zero error was large, you may have
to perform calibration adjustment twice. To repeat the
calibration adjustment, click on Calibration Adjustment
again, before clicking on Disconnect.
6. Click on Save to Module to download the new constants
and make the changes permanent (until you adjust it
again).
As Left Verification
Proceed as follows to collect verification data for the module
after you have adjusted it. Before you verify the module,
exercise it by applying full scale pressure, then venting to
atmosphere. As left data is saved in a plain text file named
“nnnnnnn.lft,” where “nnnnnnn” is the serial number of the
pressure module. You can import this file into a database or
spreadsheet program.
1. Click on As Left Verification.
2. Apply each requested pressure. Where a zero pressure
is called for, refer to Zero Pressures.
Wait for the reading to settle (to typically less than 1
count change in 5 seconds) before you go on to each
next step.
3. Click on Done to save the data to a text file.
As found data is stored as "nnnnnnn.fnd" where "nnnnnnn" is
the seven or eight-digit serial number. The only difference
between "as found verification" and "as left verification" is that
the file extension is changed to ".lft". All files are stored in the
"data" subdirectory of the working directory.
NOTE
When using the 700PCK with 700P22, 700P23,
or 700P24 Pressure Modules, derate module
specification to 0.1% if electromagnetic field
strength exceeds 2.5 V/m (above 3 V/m not
specified).
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