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The return loss is calculated using the formula:
Where Z is a complex impedance in the form Z= R + jX
Or:
r = 20 log
Where:
is the resistive portion of the reference impedance
R o
R m is the resistive portion of the measured device's impedance
is the reactive portion of the reference impedance
X o
X m is the reactive portion of the measured device's impedance
Choosing Test Conditions
The voltage and frequency are usually determined by the final application of
the part under test. 1000Hz is typical for the mid band of audio
telecommunications circuits.
V
AT
U
OLTECH
I
SER
RLOS = 20 log
(R
10
(R
M
ANUAL
( Z
/ Z
+ Z
10
O
M
2
+ R
) + (X
o
m
2
- R
) + (X
o
m
o
)
– Z
O
M
½
2
+ X
)
o
m
2
- X
)
m
P
AGE
7-97
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