Agilent Technologies 4395A - Page 370

Determining
Expected
System
performance
T
able 11-10.
Transmission Measurement
Uncertainty
W
orksheet
In
the
columns
below
,
enter the
appropriate values
for each
term. Frequency:
Error
T
erm
Symbol dB
V
alue
Linear
V
alue
Crosstalk C
Transmission
tracking
T
t
Source match M
s
Load
match
M
l
Dynamic
accuracy
(magnitude)
1
A
m
Dynamic
accuracy (phase)
1
A
p
Multiplexer Switching
Uncertainty
(magnitude)
U
m
Multiplexer
Switching
Uncertainty
(phase)
U
p
S
11
S
11
S
21
S
21
S
12
S
12
S
22
S
22
Noise
oor
N
l
High
level
noise
N
h
Connector
reection
repeatability
R
r1
,
R
r2
Connector
transmission
repeatability
R
t1
,
R
t2
Magnitude
drift
due
to
temperature
T
td
(mag)
Phase
drift
due
to
temperature
T
td
(phase)
Cable
reection
stability
S
r1
,
S
r2
Cable
transmission
phase
stability
S
t1
,
S
t2
Switch
Tracking
T
sw
Switch
P
ort Match
M
sw
Magnitude
Combine
Systematic
Errors
.
In
the
space
provided,
enter
the
appropriate
linear
values
from the
list
of
errors
.
Then
combine these
errors
to
obtain
the
total
sum
of
systematic
errors
.
C = (k)
(T
sw
+T
t
) 2
S
21
( + ) 2 = (l)
(M
sw
+
S
r1
+
M
s
)
2 S
11
2
S
21
( + + )
2
2 = (m)
(M
sw
+
S
r2
+
M
l
)
2
S
21
2
S
22
( + + )
2
2 = (n)
(A
m
+U
m
)
2
S
21
( + )
2
= (o)
Subtotal:
k
+
l
+
m
+
n
+
o
+ + + + = (S)
Combine
Random
Errors
.
In
the
space
provided,
enter
the
appropriate
linear
values from
the list
of errors
.
Then
combine
these
errors
in
an
RSS
fashion
to
obtain
a total
sum
of
the
random
errors
.
3 2 N
l
3 2 = (w)
3 2 N
h
2 S
21
3 2 2 = (x)
R
t1
2 S
21
+R
r1
2 S
11
2 S
21
2 + 2 2 = (y)
R
t2
2 S
21
+R
r2
2 S
22
2 S
21
2 + 2 2 = (z)
p
w
2
+x
2
+y
2
+z
2
p
2 + 2
+ 2 + 2 =
(R)
S+R + = (V
t
)
Total Magnitude Errors:
E
tm
(linear) = V
t
+T
td
(mag) 2 S
21
+( 2 )=
E
tm
(log) = 20 Log(1 6 E
tm
/S
21
) 20 Log(1 6 / )= dB
Phase
E
tp
= Arcsin[(V
t
0 (A
m
+U
m
) 2
S
21
)/S
21
]+T
td
(phase) + S
t1
+S
t2
+A
p
+U
p
Arcsin[( 0 ( + ) 2 )/ ]+ + + + +
= 6 deg.
1 With IF bandwidth of 10 Hz.
11-54 Specications and Supplemental Characteristics