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Calibration <br />Well Site Calibration Procedure (W'edee Wireline) <br />A. With tool in hole an~i in fluid, panel output is calibrated for a linear output <br />relation of 100 mv. for 10 chart divisions-10 my/div. This calibration is <br />done in order to scale the amplitude values. <br />B. Secondary amplitude x 4 or x5 is calibrated. <br />C. Internal calibration cycle of 35 mv. amplitude and 50 microseconds wave <br />length is activated; the Gate is set on the cycle, and amplitude deflection is <br />adjusted according to previous 0-100 mv. settings. <br />D. Calibration cycle is deactivated. tool signal on 3 foot receiver is present; <br />the gate is set on the first compressional cycle, and amplitude reading is <br />verified. It should be noted that our system does not rely on free pipe <br />sections in order to calibrate or adjust the amplitude curve. <br />Shop Calibration (Wedge Wireline'1 <br />A. The tool is centered inside a section of 5.5 inch, 151b/ft. casing ; <br />completely covered with water; the tank is pressured to 5000 psi.; the <br />signal on the 3 foot receiver is adjusted for a maximum output of 80 mv. <br />B. Signal output on thc; 5 foot receiver is adjusted in order to compensate for <br />energy loss related U~ the 3 foot receiver, due to the extended travel time of <br />114 microseconds, v/hich usually ranges in the order of 30% loss. <br />C. Panels aze calibrated for response and linearity. <br />D. After the above procedure is completed, a full display of calibration is <br />recorded for every tool. <br />Notes: <br />An internal electrical calibration for the peak amplitude measurement is <br />utilized to calibrate the instrument. (Atlas Wireline) <br />The shop calibration fixture utilized is a 5.5 inch OD aluminum pressure <br />tube. The tube is filled with water and pressured up to 500 psi or greater. <br />