Specifications

RUSKA 7250, 7250i, 7250xi & 7250LP
Users Manual
6-10
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 RUSKA 7250’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.
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.
The zeroing screen presents several pieces of information.
The screen will display the current status of the pressure sensor Stability and
Temperature. If any of the above are unstable, then the system will delay until stability is
achieved. Pressing OK [F6] will bypass this wait period.
Note
By-passing this wait period can have a negative effect on the zeroing
procedure.
Gauge and Vacuum (Negative Gauge) Instruments
1. Verify that the Reference Port is open to atmosphere.
2. Enter the Calibration screen by selecting MENU | CALIBRATION.
3. Select Zero [F1]. Do NOT press the Calibrate button.