MBR5 User Manual
MBR5 Rev 007
17
Repeat the preceeding steps for all other wavelengths at which the
measurements are to be made.
Figure 4: Measuring BR0 (Mandrel Technique)
Measuring BR (Including Connector)
Once a BR0 measurement is performed and the value stored, the second
termination is made after the DUT in order to obtain BRtot . To measure the
backreflection from a DUT, such as a connector, follow the instructions below.
NOTE: Only Single-‐Mode fiber termination is shown. Please refer to the
“TERMINATION TECHNIQUES” section for multimode fiber termination.
1.
Clean the output connector of the measurement jumper and the
input connector of the DUT, and mate the two. Refer to the
“CLEANING CONNECTORS” section for more information on page 36.
2.
Press the
λ
key to select the wavelength at which the measurement
is to be made.
3.
Terminate the measurement jumper immediately after the DUT
(see Figure 5 and Figure 6) and hold the termination point steady.
4.
The meter displays the backreflection that is caused by the fiber, all
connections, and the DUT that lies between the two termination
points (that is the termination point for BR0 and the current
termination point. This area is shown within the dashed line in
Figure 7.
Mandrel Wrap
Measurement
Jumper
FC/APC
850
1310
1550
DETECTOR
CHANNEL
1
MENU
LOCAL
BR
BR
O
POWER
REF DARK
MBR5 Backreflection Meter
-65.0dB 1310
1
BACKREFLECTION
