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Getting Started
Using your Attenuator as a Variable Back Reflector
1.4 Using your Attenuator as a Variable Back
Reflector
NOTE 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 REFL 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
RLInput dB
()–
10
--------------------------------------
110
RLInput dB()–
10
--------------------------------------
–
10
2 Att dB
()InsLoss dB()+()RLRef dB()+()–
10
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+
log–=