3-20
Operation
4038501 Rev C
Temperature Back-off
Introduction
The temperature back-off feature is used to off-set the attenuator and equalizer when
the amplifier is auto aligned at a non-room temperature, to allow the AGC module
to work at room temperature. This feature is used for the auto alignment function
only, and is turned off when the auto alignment is completed.
Notes:
45 dB cable loss at 1 GHz is used to simulate the network variation over
temperature.
Room temperature is defined as 20
℃
.
Using the Temperature Back-off Feature
To use the temperature back-off feature, set up the desired value in submenu “731
Cable Temp” as per instructions on page 3-17.
There are two ways to determine the temperature compensation needed.
1.
When the amplifier‟s ambient temperature is very
different
from the “network”
temperature, the user should enter the estimated “network” temperature
manually, by selecting from the available values in the submenu, including -20
℃
,
-10
℃
, 0
℃
, 10
℃
, 20
℃
, 30
℃
, 40
℃
, 50
℃
, and 60
℃
. If 20
℃
is selected, the
temperature compensation function is turned off.
2.
When the amplifier‟s ambient temperature is about the
same
as the “network”
temperature, the user can select AUTO in the submenu, and a sensor inside the
amplifier will measure the temperature and calculate the compensation
automatically.
