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HP 435B - Calculating M Eas Ureme Nt un Certai Nty

HP 435B
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O
p
e
r
at
i
o
n
M
od
e
l
435
Β
3- 1
4
1
.
Fo
r t
hi
s
e
x
a
mpl
e
t
h
e
kn
ow
n
v a
lu
es
a
r
e
:
source S
WR,
2
.2
a
nd
po
w
e
r
se
n
so
r
S
WR,
1
.16
.
Fr
o
m
t
h
e
Mi
s
m
atc
h
E
rr
o
r
Ca
l
c
ul
ato
r t
h
e
mi
s
m
atc
h
un
ce
r ta
in
t
y
i
s
fo
und
to
b
e
+0
.24,
--0
.25
dB
.
2
.
Add
t
h
e s
p
ec
ifi
e
d un
ce
r
ta
in t
i
es fr
o
m
Fi
gure
3-5,
(±0
.26
dB)
.
O
ur
tota
l
m
eas
ur
e
m
e
n
t
un-
certainty
is
+0
.50,
-0
.51
dB
.
3
.
Ca
l
c
ul
ate
t
h
e
re
l
at
iv
e
meas
ur
e
m
e
n
t
un
certa
in t
y
fr
o
m
t
h
e
fo
ll
o
win
g
fo
rmul
a
:
d
_
Μ
U
=
Ρ
1
=
log-,
dB)
)
CA
L
CUL
ATI
NG
ME
AS
UREMEN
T
UN
C
ER
TAI
NTY
dB
=
10
log
Ρ
1
(PO
dB
logC
Ρ
1\
10
ΡΟ
Ρ
(dB)
1
log
_
1
10
>,
.
log-1
(Q9
1
5
0
0)
=
log
-
'
(-0
01)
=
1
.122
=
0
.889
4
.
Ca
l
c
ul
ate
t
h
e
p
er
ce
n
tage
M
eas
ur
e
m
e
n
t
Un
certa
in
t
y
.
%
MU
=
(
Ρ
1
-
PO)
100
_
(1
.122
-1)
100
=
(0
.889
-1)
100
_
+12
.2%
ο
=
-11
.1%
ο
F
igure
3-8
.
Calculating
M
easurement
U
ncertainty
(
U
ncertainty
in
d
B
Known)

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