32
Getting Started
Using your Attenuator as a Variable Back Reflector
1.4 Using your Attenuator as a Variable Back
Reflector
N O T E
Before using the instrument, you should make sure that it is properly
warmed up. The instrument is properly warmed up when it has been
switched on for a minimum of 45 minutes. Failure to do this can cause
errors of up to 0.04dB in the attenuation.
To use the attenuator as a back reflector, you need to set up the
hardware as shown in the figure below.
Figure 1-4
The Hardware Configuration for the Back Reflector (Options 201 and
203)
Press B
ACK
R
EFL
to start operation as a back reflector. You need to
enter measured values for the insertion loss of the attenuator (
INS
LOSS
), the return loss of the attenuator (
RL INPUT
), and the
reference return loss you are using (
RL REF
). The return loss (RL)
is calculated according to the equation
You edit the value for the return loss while the application is
running.
RL dB
(
)
10
10
RLIn pu t d B
(
)
–
10
--------------------------------------
1
10
RLIn pu t d B
(
)
–
10
--------------------------------------
–
10
2 Att dB
(
)
In sLoss d B
(
)
+
(
)
RLRef d B
(
)
+
(
)
–
10
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+
log
–
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