Agilent Technologies 4395A, Ручное изменение

Страница: 369 / 575

Determining Expected System performance
T able 11-9. Reection 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
Directivity D
Reection tracking T
r
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
Noise oor N
l
High level noise N
h
Connector reection repeatability R
r1
, R
r2
Connector transmission repeatability R
t1
, R
t2
Magnitude drift due to temperature T
rd
(mag)
Phase drift due to temperature T
rd
(phase)
Cable reection 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 .
(1 + T
sw
)2(D + S
r1
) ( + )2( + ) = (k)
(T
sw
+ T
r
)2S
11
( + )2 = (l)
(M
sw
+ S
r1
+ M
s
)2S
11
2S
11
( + + )2 2 = (m)
(M
sw
+ S
r2
+ M
l
)2S
21
2S
12
( + + )2 2 = (n)
(A
m
+U
m
) 2 S
11
( + )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 .
32N
l
32 = (w)
32N
h
2S
11
32 2 = (x)
R
r1
+ 22R
t1
2S
11
+ R
r1
2S
11
2S
11
+22 2 + 2 2 = (y)
R
r2
2S
21
2S
12
2 2 = (z)
p
w
2
+ x
2
+ y
2
+ z
2
p
2 + 2 + 2 + 2 = (R)
Subtotal: S + R + = (V
r
)
T otal Magnitude Errors:
E
rm
(linear) = V
r
+ T
rd
(mag) 2 S
11
+( 2 ) =
E
rm
(log) = 20 Log(16E
rm
/S
11
) 20 Log(16 / ) = dB
Phase
E
rp
= Arcsin[(V
r
0 (A
m
+U
m
) 2
S
11
)/S
11
] + T
rd
(phase) + 22S
t1
+
A
p
+ U
p
Arcsin[( 0( + )2 )/ ]+ +22 + +
= 6 deg.
1 With IF bandwidth of 10 Hz.
Specications and Supplemental Characteristics 11-53