Fluke RUSKA 7350 - Manual (Page 67)

Maintenance
Calibration
6
6-5
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.
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 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.