2017.06.19 FwdMan2.8.17.docx 13-105
13. Calibration
13.1 Relative Deflector Calibration
Relative Deflector Calibration Procedure assures the highest possible degree of deflection
basin accuracy and consistency (without performing a reference calibration). This calibration
can be performed by the user. The Relative Deflector Calibration Procedure verifies the
similarity of the response from each of the deflection sensors. A series of multiple drops are
recorded when all the deflection sensors are mounted in a stand and exposed to the same
deflection.
Reference Deflector Calibration Verification requires specialized equipment (can be
performed by Dynatest) and will not be detailed here. The Relative Calibration Procedure,
however, also reveals if the gain of a deflector is out of range. Hence this Relative Calibration
Procedure is so very important. The procedure is the same for FWD, HWD and Fast FWD.
The system should be charged during testing.
The Relative Deflector Calibration consists of three steps.
Data collection A test is performed to obtain data from the deflection sensors
Analysis ”PrEN-5 RelCal.xlsx” is used to calculate the data
Gain adjustment: If required the relative gains are adjusted in DDC
13.1.1 Data Collection
Remove the deflection sensors from the raise/lower bar and place them in the calibration
column starting with deflector number one in the bottom as shown under “1. RUN” in below
picture.
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