3-10
IM AQ1200-01EN
3.6 Setting Analysis Conditions
<Detail Mode and Multi WL Mode>
Procedure
Analysis Setup Screen
1.
Using the
rotary knob
and
ENTER
, select
OTDR
.
2.
Press
SETUP
and then the
Analysis Setup
soft key.
3.
Using the
rotary knob
and
ENTER
, set Mode to
Detail
or
Multi WL
to display the following
screen.
Set Mode to “Detail” or “Multi WL.”
The Multi WL option is not available on the AQ1200B
and AQ1200C.
Displays the specified wavelength
When Mode is “Detail,” only the one specified waveform is
displayed.
Set the index of reflection (1.30000 to 1.79999).
Set the backscattering light level (–10.00dB to
–64.99dB).
Set the approximation method (marker; LSA, TPA).
Set the approximation method (event; LSA, TPA).
Set the event’s splice loss (0.01dB to 9.99dB).
Set the event’s return loss (20dB to 70dB).
Set the end of fiber (Fresnel reflection; 3dB to 65dB).
Turns the fault event display on or off
Set the fault event’s splice loss (0.01dB to 9.99dB).
Set the fault event’s return loss (20dB to 70dB).
Set the fault event’s OK/No Good judgement display
(Display, Hide).
Initializes the settings
Press to reset the settings to their factory defaults.
Explanation
Index of Reflection
The AQ1200 uses indices of reflection in the calculations that it performs to measure distance. If you
do not set the correct index of reflection, the distance measurement will be incorrect.
The AQ1200 has the following preset indices of reflection that correspond to each wavelength.
1310 nm: 1.46000
1550 nm: 1.46000
1625 nm: 1.46000
1650 nm: 1.46000
You can specify a value from 1.30000 to 1.79999.
Backscattering Light Level
Light that travels through an optical fiber displays a phenomenon known as Rayleigh scattering. Due
to this phenomenon, a portion of the light is sent backwards, in the direction opposite to the direction
of propagation. This phenomenon is known as backscattering. The backscattering light level setting
is used when the AQ1200 calculates the return loss and total return loss.If you do not set the correct
backscattering light level, the return loss and total return loss measurements will be incorrect.
The AQ1200 has the following preset backscattering light levels that correspond to each wavelength.
1310 nm: –50 dB
1550 nm: –52 dB
1625 nm: –53 dB
1650 nm: –53 dB
You can specify a value from -10.00 to -64.99.
