Promax HD RANGER 2 User Manual page 210

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Next it is shown the screen to perform the fibre optic test:
Figure A5.3.
Status message depending on the level of attenuation.
Power level of the signal.
Wavelength of the signal (nm).
Power level of the reference signal, which is used to calibrate and
calculate the attenuation level (dBm).
Power level of the test signal at the user's access point (dBm).
Attenuation level (dB); Attenuation = Current - Reference.
"Advanced" key to access these options: Threshold attenuation and
Max. attenuation (see Max. dashed line).
"Exit" button to exit the screen.
"Set Reference" key to calibrate the reference signal.
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June 2014