Fluke RUSKA 7350 - Manual (Page 65)

Maintenance
Calibration
6
6-3
Calibration Instructions — Single Sensor
To calibrate the RUSKA 7350, the user simply connects a calibration standard to the
Calibrator’s Test port then follows the 4-step calibration procedure on the Callibrator’s
display. The calibration procedures is a menu driven procedure that steps the user through
the pressures that are required to calibrate each pressure range that is included in the
Calibrator. The user generates the defined pressures utilizing an adequate standard to
calibration the RUSKA 7350. The pressure steps will vary based on the pressure range
and number of sub ranges that are included with the RUSKA 7350. Typically, for a single
range instrument, the operator would be prompted to generate Atmosphere, 50%, 100%,
and 50% of the Calibrator’s full scale operating range of a sensor (See Chapter 6,
Observing the RUSKA 7350’s Full scale Rating). No disassembly is required and there
are no potentiometers to tune.
Note
The uncertainty of the final calibration must include the uncertainty of the
standard being used.
Preparation
• Verify that the calibration standard is connected to the TEST PORT.
• Verify that the RUSKA 7350 has been at stable operating temperature for at
least two hours
• Verify that the RUSKA 7350 is in Measure mode (See Chapter 4, Local
Operation).
• Verify and set the head pressure to zero in Menu ⎢Setup ⎢User.
• (Triple range only) Verify the range to be calibrated is selected. To change press
the Mode ⎢Range [F5].
• If desired, change the RUSKA 7350’s units of measure (See Chapter 4) to match
those of the calibration standard.
• To go to the Calibration screen, select MENU/CAL.
To begin the calibration process, press MENU ⎢CALIBRATE ⎢CALIBRATE. If the
calibration access code is enables, enter it at the prompt. The Calibration, Step 1, screen
will appear.
Note
To exit the calibration procedure before the calibration coefficients have
been changed, press CANCEL any time during the procedure.
Step 1
1. To begin Step 1 of the calibration process, select Step 1. Enter the actual pressure
applied and press ok.
2. Wait until the zero procedure completes. When the 7350 completes Step 1, the
Calibration, Step 2, screen will appear.
Step 2
1. To begin Step 2, use the calibration standard to Apply the mid-point pressure
requested by the RUSKA 7350. As pressure is to be applied into the Test Port, the
Measured pressure on the RUSKA 7350’s screen will change accordingly.
2. When the Measured pressure stabilizes, use the RUSKA 7350’s numeric keypad and
OK to enter the actual pressure applied by the calibration standard. Do not enter the
Measured pressure reported by the RUSKA 7350. If necessary, use the CLEAR key
to correct a mistake in the edit field. If the actual pressure applied is acceptable, the
Calibration, Step 3, screen will appear.