Agilent Technologies 4395A - Page 353

Dynamic
A
ccuracy
Dynamic A
ccuracy
The
dynamic
accuracy
value
used in
the system
uncertainty equations
is obtained
from the
analyzer's
dynamic
accuracy
typical
values.
The typical
value for
magnitude dynamic
accuracy
is
in
dB
,
and it
must be
converted to
a linear
value to
be used
in the
uncertainty
equations
.
In
addition,
the
analyzer's
dynamic
accuracy typical
values are
given for
an input
signal level
from
full
scale
in
dB.
This must
be converted
to a
relative
error
(relative
to
the
power
at
which
the
measurement
calibration
occurs)
to be
used in
the system
uncertainty equations
.
Dynamic A
ccuracy (linear)
=10
6
DynAcc(dB)
20
7 1
Dynamic
A
ccuracy
(dB)
=
20
l
og
(1
6 Dynamic
Accuracy
(linear))
Magnitude
Dynamic
Accuracy
Typical
magnitude
dynamic accuracy
can be
expressed in
the
following
equations:
Magnitude
Dynamic
A
ccuracy
=
E
d1m
+
E
d2m
+
E
d3m
E
d1m
=
1
:
39
2
10
0
2
L
2
E
d2m
=
1
:
73
2 10
0
3
E
d3m
=
6
: 95
2 10
0
7
L
where
,
L
=
Measurement
level
(linear
,
relative
to
full
scale
level)
E
d1m
=
Magnitude
compression
error
(dominant
at
high
measurement
level
range)
E
d2m
=
Magnitude
residual
error
(dominant
at
middle
measurement
level
range)
E
d3m
=
Magnitude
A/D
converter
dierential
nonlinearity
error
(dominant
at
low
measurement
level
range)
Determining Relative
Magnitude Dynamic
Accuracy
Error Contribution
Typical
magnitude
dynamic accuracy
error contribution
to system
performance
is
expressd
bellow:
Magnitude
dynamic
accuracy
error
=
j
E
d1mMEAS
0
E
d1mREF
j
+ max(E
d2mMEAS
; E
d2mREF
)
+
E
d3mMEAS
+
E
d3mREF
where,
Sux ref means errors at calibration
Sux
meas means errors at DUT measurement
Specications and Supplemental Characteristics 11-37