MBR5 User Manual
MBR5 Rev 007
16
Set-‐up for BR Measurements
To prepare the meter for backreflection measurements:
1.
Follow the “POWERING UP THE METER” sequence on page 15.
2.
Clean the output port on the front of the meter and the FC/APC
connector of the measurement jumper (see the “CLEANING THE
CONNECTOR ENDS” section on page 34).
3.
Connect the FC/APC end of the measurement jumper to the output
port on the meter. Make sure to properly align the connector key
and screw it firmly but do not over screw. The output connector of
the measurement jumper is user-‐selected and must be compatible
with the input connector of the DUT.
4.
Attach the appropriate adapter to the detector on the front of the
meter.
5.
Press the BR key to set the meter to Backreflection mode. BR mode
is indicated on the display.
6.
Press the
!
or
"
key to select the required output port.
7.
Press the
λ
key to select the required wavelength.
8.
Clean and connect the output connector of the measurement
jumper to the detector adapter on the front of the meter.
9.
Press the REF key; the offset value (equal to twice the measured
loss) is briefly displayed. A small dot on the bottom right of the LCD
display is displayed to indicate that the meter is using the measured
offset value to calculate the backreflection.
10.
To have the meter perform the setup for all wavelengths, press and
hold the REF key for two seconds.
11.
Repeat steps 1 to 10 for the next required output port.
12.
Disconnect the output connector from the detector adapter.
Measuring BR0
1.
Press the
λ
key to select the required wavelength.
2.
Terminate the measurement jumper just before the output
connector, and hold the termination point steady. Refer to the
“TERMINATION TECHNIQUES” section for more information on how
to properly perform a termination on page 25.
3.
Press the BR0 key to store the new BR0 value. The key LED will light
up to indicate that the BR0 value has been stored. If a previous BR0
measurement has already been stored (i.e. the BR0 LED is already
ON), the old value must be deleted first by pressing the BR0 key to
turn the BR0 LED OFF. Pressing the BR0 button again will store the
new value.
