Fluke Calibration RUSKA 7615, User Manual

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Maintenance
Calibration
6
6-3
Calibration Instructions—Single and Dual Sensor
To calibrate the RUSKA 7615, the user simply connects a calibration standard to the
RUSKA 7615’s Test Port then follows the 4-step calibration procedure on the
Calibrator’s display. On dual sensor versions, the operator would be instructed to select
one of the two sensors to be calibrated. The calibration procedure 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 calibrate the RUSKA 7615. The pressure steps will vary
based on the pressure range and number of sub ranges that are included with the
Calibrator. 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 Calibrator’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 Calibrator has been at stable operating temperature for at least
two hours.
•
Verify that the Calibrator is in Measure mode (Chapter 4).
•
Verify that the head height is set to 0.
•
If desired, change the Calibrator’s units of measure (Chapter 4) to match those of the
calibration standard
•
To go to the calibration screen, select MENU/CAL.
•
Verify that the air supply is connected and set to 90-110 psi.
To begin the calibration process, press the recessed CAL button beneath the vacuum
fluorescent display. If the Calibration access code is enabled, 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 ZERO. Enter the actual pressure
applied and press OK. Since the 7615 have absolute pressure sensors, it is common to
zero the 7615 at the current barometric pressure.
2. Wait until the zero procedure completes. This may take several minutes. When the
7615 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 of the
range of the sensor being calibrated requested by the 7615. As pressure is admitted
into the Test Port, the Measured pressure on the 7615’s screen will change
accordingly.