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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
Γ
s
difference of approximately 120°. However, an approximate solution using two
values of Γ
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 N432A.
3 A message will appear to inform you of the current bridge resistance value and
4 You will then be prompted for confirmation to proceed with zeroing. Press
5 Another message will appear, prompting you to confirm whether the sensor
6 Zeroing will start automatically. The Zeroing pop-up message will be displayed
7 Set up the following connections shown in
Keysight N432A User's Guide
, additional values of load reflection coefficient are required with a phase
can give adequately accurate results provided the phase angle of the
L
require you to select a new resistance value or reconfirm the current resistance
value. Use the softkeys to select a value of 200 Ω.
Confirm to proceed.
has been disconnected from the RF source. Press Confirm once you have
verified that there is no RF source connected.
during the zeroing process.
is used to measure the S
coefficient of the thermistor sensor.
2
(
Γ
)
1 Γ
P
1
–
–
1
2
-----
------------------------ -
--------------------------
=
P
2
(
Γ
)
1 Γ
1
–
–
2
1
1 Γ
Γ
–
s
2
----------------------- -
M
=
1 Γ
Γ
–
s
1
because it is a complex quantity. To solve for
s
Figure
parameter which is equivalent to the reflection
11
2
Γ
s
2
2
Γ
s
1
.
2-45. The network analyzer
2
97
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