Fluke RUSKA 7252, User Manual

Page: 102 / 128

RUSKA 7252
Users Manual
6-10
Editing the Calibration Coefficients
If the Calibrator’s memory is erased but the calibration coefficients are known, the user
can restore the coefficients to the Calibrator 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 Calibrator is in Measure mode (see Chapter 4).
2. Enter the Calibration screen by selecting [ MENU] 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 press the Sensor [ F6 ] function key.
The two common sensors calibrated are the RUSKA sensor which is labeled Primary
and, if the unit has the optional Barometric Reference sensor, this is labeled
Atmospheric Sensor .
4. To edit the calibration coefficients, press the CALIBRATE 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 Calibrator’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, press the previous
key.
9. Press PREVIOUS to return to the Main Menu.
10. 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.