Fluke RUSKA 7252, User Manual

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RUSKA 7252
Users Manual
6-8
RPT Calibration — Simulated Absolute
A span correction can be applied to the RPT (barometric) sensor. This correction is done
using the Calibrator software and can be performed without removing the RPT from the
Calibrator chassis.
1.
Place the Calibrator in Measure mode. Remove all pressure sources from the system.
2. Connect a pressure standard to the Reference Port of the Calibrator.
Note
On the RUSKA 7252, there are two reference ports. Typically the RPT is
connected to the top reference port. However, this can vary based on the
configuration of the RUSKA 7252. If the barometric sensor does not react
when changing the pressure in the top reference port, try the lower
reference port.
3. If desired, change the Calibrator’s units of measure (see Chapter 4) to match those of
the calibration standard.
4. To access the Calibration screen, from the Main Menu, select the [MENU] MENU |
CALIBRATE .
5. Select the atmospheric sensor by pressing the Sensor [ F6 ] key until the words
Atmospheric Sensor are displayed above the calibration coefficients.
6. To begin the calibration process, press CALIBRATE . If the calibration access code
is enabled, enter it at the prompt. The first calibration screen will appear.
7. You will use the calibration standard to apply the various pressures that will be
requested by the RUSKA 7252. The screen will display a table noting the following
information;
a.
Step — The pressure step in the calibration sequence.
b. Apply — The pressure that the standard is to generate to the Calibrator.
c. Actual — The actual pressure value that was generated by the standard when the
point was accepted.
8. The Actual value will be highlighted. This is your first pressure point in the
calibration procedure. This calibration requires the generation of two pressures within
the range of 700 to 1100 mbar absolute. The selected pressures should be spaced as
far apart as possible within the allowable range.
9. Generate the first pressure. Enter the actual value of the applied pressure generated
by the standard and press ENTER .
10. Generate the second pressure. Enter the actual value of the applied pressure generated
by the standard and press ENTER .
11. The RPT sensor is now linearly compensated. Once the calibration procedure is
complete, the user should verify several pressure readings against the pressure
standard. If there are variances beyond the stated precision, then an error was
probably made in generating one of the calibration pressures, and the calibration
procedure should be repeated.
12. Remove the pressure source from the Reference Port.