Keysight Technologies E4417A Service Manual page 61

2 Performance Tests
25 Calculate factor M using equation 2-11 and record the value:
Equation 2-11:
26 Calculate the value of the output voltage reflection coefficient (
Equation 2-12:
Γ s
27 Calculate the value of the output SWR using Equation 2-13 and record the
Equation 2-13:
66
2
⎛
1
Γ 2
–
P 1
⎝
M = - - - - - - - - - - - - - - - - - - - - - - - - - -
P 2
2
⎛
1
Γ 1
–
⎝
– P ___________
2
equation 2-12 and record the value:
2 Γ 1 M 2 Γ 2
(
–
= - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
One of the roots of this equation will be non-physical while the other gives a
Γ s
value for .
Γ s
– ___________
value:
1 +
( Γ s )
SWR = - - - - - - - - - - - - - - - - - -
( 1 Γ s )
–
– Output SWR ___________
⎞
⎠
⎞
⎠
2 Γ 2 2 Γ 1 M
) ± (
–
2
⎛
2 Γ 1
⎝
Keysight E4416A/E4417A Power Meters Service Guide
2 2
⎛
4 Γ 1 M
)
–
⎝
2
⎞
M
Γ 2
–
⎠
Γ s
) using
2
⎞ M 1
Γ 2 ( )
– –
⎠