2-10
IM AQ7280-01EN
Setting Analysis Conditions in Detail Mode
Press the
Analysis Setup
soft key to display the following screen.
When the screen is scrolled
Set the index of refraction
(1.30000 to 1.7999).
Set the splice loss (0.01dB to 9.99dB).
Executes initialization
Press to reset the analysis settings to
their factory defaults.
Set the splitter search (OFF, ON).
Set the splitter loss (1dB to 20dB).
Set the approximation method (marker).
See page 2-3.
Set the backscatter level
For a pulse width of 1 μs:
–10.00 dB to –64.99 dB
For a pulse width of 1 ns:
–40.00 dB to –94.99 dB
Set the return loss (20dB to 70dB).
Set the end of fiber (3dB to 65dB).
Set the launch fiber cable
(Setup[OFF], Setup[ON]).
Set the pass/fail judgment
(Setup[OFF], Setup[ON]).
Set macro bending
(Setup[OFF], Setup[ON]).
Set the approximation method (event).
See page 2-3.
Index of Refraction (IOR)
The AQ7280 uses the index of refraction to calculate the distance. If you do not set the index of
refraction correctly, the distance measurement will be incorrect. The index of refraction varies
depending on the connected optical fiber cable. Enter the value recommended by the manufacture
of the cable.
The AQ7280 has the following preset indices of refraction that correspond to each wavelength.
Wavelength
Index of Refraction
Wavelength
Index of Refraction
850 nm
1.46000
1490 nm
1.46000
1300 nm
1.46000
1550 nm
1.46000
1383 nm
1.46000
1625 nm
1.46000
1310 nm
1.46000
1650 nm
1.46000
You can specify a value from 1.30000 to 1.79999.
Backscatter Level
Light that travels through an optical fiber cable displays a phenomenon known as Rayleigh
scattering. Due to this phenomenon, light is sent backwards, in the direction opposite to the
direction of propagation. This phenomenon is known as backscattering. The backscatter level
setting is used when the AQ7280 calculates the return loss and total return loss.
2.1 Setting the Measurement and Analysis Conditions