Maintenance
Calibration
6
6-9
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.
Editing the Calibration Coefficients
If the PPI’s memory is erased but the calibration coefficients are known, the user can
restore the coefficients to the PPI by following the directions below.
W
Caution
Never randomly adjust the calibration coefficients. Only
qualified personnel with valid backup data should be allowed to
edit the coefficients. If the backup coefficients are questionable,
perform the calibration procedure in its entirety.
1.
Verify that the PPI is in Measure mode (Chapter 4).
2.
Enter the Calibration screen by selecting MENU | CALIBRATE.
3.
When you first enter the Calibration menu, the top line of the display will indicate
which sensor is being the viewed. The sensors coefficients are then shown below the
sensor label. The first sensor that is shown is the primary measuring sensor. This is
indicated by the word Primary displayed in the top of the display. To cycle through
the various sensors that exist in the system, you would press the Sensor [F6] function
key. The two common sensors that would be calibrated would be the RUSKA sensor
which would be labeled as Primary and if the unit has the optional Barometric
Reference sensor, this would be labeled as Atmospheric Sensor.
4.
To edit the calibration coefficients, press the EDIT button. If the calibration access
code is enabled, enter it at the prompt. The first calibration screen will appear.
Note
To exit the calibration procedure before the calibration coefficients have
been changed, press CANCEL any time during the procedure. Canceling
restores all previous calibration values.
5.
Use the rotary knob to highlight the coefficient to be edited. The terms are
coefficients of a linear regression analysis.
6.
Use the numeric keypad and the ENTER key to enter a new value. To correct a
mistake in the edit field, use the CLEAR key.
7.
Repeat steps 4 and 5 until all coefficients are correct.
Note
In addition to saving the calibration coefficients to the PPI’s memory,
separately record the calibration coefficients and store this “backup” in a
safe place.
8.
To exit the editing procedure without storing the calibration coefficients in memory,
press CANCEL. To store the calibration coefficients in memory, select DONE [F6].
9.
Press PREVIOUS to return to the Main Menu.
Once the calibration coefficients are input, the user should record several pressure
readings. If there are any variances beyond the stated precision at these points, then the
calibration procedure should be performed.
Summary of Contents for RUSKA 7050
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