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The Tektronix 067-1049-00 is an optical calibration signal generator for the OF150 Fiber Optic Time Domain Reflectometer. It supplies three optical signal levels that may be used to verify the vertical scale of the OF150 display − 50 dB, 60 dB, and 70 dB referenced to the bottom of the display − and nine electrical signal levels for calibration of the OF150 Log Amplifier circuit (20 to 100 dB in 10 dB steps).