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Therefore:
The left side of the equation can be replaced by the factor M as follows:
This cannot be directly solved for Γ
solve for Γ
with a phase difference of approximately 120°. However, an approximate
solution using two values of Γ
provided the phase angle of the source is within ±40° of 0° or ±180°.
The following procedure describes how to measure the VSWR of a source.
1 Preset the N432A to its default state by pressing
2 Connect a thermistor sensor to the channel A input connector of the
3 A message will appear to inform you of the current bridge resistance
4 You will then be prompted for confirmation to proceed with zeroing.
5 Another message will appear, prompting you to confirm whether the
6 Zeroing will start automatically. The Zeroing pop- up message will be
7 Set up the following connections shown in
N432A User's Guide
, additional values of load reflection coefficient are required
s
N432A.
value and require you to select a new resistance value or reconfirm the
current resistance value. Use the softkeys to select a value of 200 Ω.
Press Confirm to proceed.
sensor has been disconnected from the RF source. Press Confirm once
you have verified that there is no RF source connected.
displayed during the zeroing process.
analyzer is used to measure the S
the reflection coefficient of the thermistor sensor.
(
Γ
)
1 Γ
–
–
2
P
1
1
2
----- -
------------------------- -
-------------------------- -
=
(
Γ
)
1 Γ
–
–
P
2
1
2
1
1 Γ
Γ
–
s
2
------------------------
=
M
1 Γ
Γ
–
s
1
because it is a complex quantity. To
s
can give adequately accurate results
L
parameter which is equivalent to
11
Operating Information
Γ
2
s
2
Γ
2
s
1
.
Figure 2-
45. The network
2
83
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