Maintenance 6
Calibration
Editing the Calibration Coefficients
If the RUSKA 7350’s memory is erased but the calibration coefficients are known, the user can restore the coefficients to the RUSKA 7350 by following the directions below.
WCaution
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 RUSKA 7350 is in Measure mode (Chapter 4, Local Operation).
2.To go to the Calibration screen, select MENU ⎢CALIBRATE.
3.To edit the calibration coefficients, press the EDIT KEY. If the calibration access code is enabled, enter it at the prompt.
Note
To exit the calibration procedure before the calibration coefficients have been changed, press CANCEL any time during the procedure.
4.Use the arrow keys to highlight the coefficient.
5.Use the numeric keypad and ENTER key to enter a new value. To correct a mistake in the edit field, use the CLEAR key.
6.Repeat steps 4 and 5 until all four coefficients are correct.
Note
In addition to saving the calibration coefficients to the RUSKA 7350’s memory, the user is advised to separately record the calibration coefficients and store this “backup” in a safe place.
7.To exit the editing procedure without storing the calibration coefficients in memory, press CANCEL. To store the calibration coefficients in memory, select OK.
8.Press PREV. to return to the main screen.
Once the calibration coefficients are input, the user is advised to record several pressure readings. If there are any significant errors at these points, then the calibration procedure should be performed.
Zeroing
The zero procedure may be performed by itself without requiring a full calibration.
•Verify ABS Mode.
•Verify that the RUSKA 7350’s test port is open to atmosphere.
•Verify that the RUSKA 7350 has been at stable operating temperature for at least 30 minutes.
•Verify that the RUSKA 7350 is in Measure mode.
1.Enter the calibration screen by selecting MENU ⎢CALIBRATE.
2.Select ZERO. The CAL button should not be pressed. If the CAL button is pressed, a full calibration will be selected.
3.Use the numeric keypad to enter the atmospheric pressure at the test port. Press OK when the measured pressure is stable.
4.Wait until the zero procedure completes. When the RUSKA 7350 completes the procedure, it will return to the CAL screen.