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Editing the Calibration Coefficients
If the ADTS's memory is erased but the calibration coefficients are known, the user can
restore the coefficients to the ADTS by following the directions below.
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 ADTS is in Measure mode (Chapter 4).
2. Enter the Calibration screen by selecting MENU | MENU | CALIBRATE|
CALIBRATE.
3. When first entering 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 Ps sensor. Press the Sensor [F6]
function key to cycle through the various sensors that exist in the system.
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.
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.
In addition to saving the calibration coefficients to the ADTS'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.
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.
Zeroing
The zeroing procedure is performed to correct for system zero shift and does not require a
full calibration. The most important requirement for performing a valid zeroing procedure
is to guarantee that there is not a pressure differential between the sensor's test port and
case reference.
If during the zeroing procedure, the message "Mechanical Zeroing Needed" appears, the
sensor photocell may need to be zeroed. See Chapter 6, Sensor Photocell Zeroing, for
more information.
The zeroing screen presents several pieces of information.
W Caution
Note
Note
6
Maintenance
Calibration
6-7
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