Agilent Technologies 8504B - Return Loss Uncertainty

FINAL TRIM SIZE : 7.5 in x 9.0 in
Specications
and
Regulatory
Information
Specications
Return Loss
Uncertainty
Description
Return
loss
uncertainty
gives
the
possible
range
of
true
return-loss
values
,
given
a
specic
measured
value
.
F
or
example
,
if
the
measured
return loss
was
0
57
dB
and
the
uncertainty
was
+1.8
dB
and
0
1.7
dB,
the true
return
loss
value
would
lie
somewhere
between
0
55.2
dB
( 0
57 +
1.8) and
0 58.7
dB
(
0
57
0
1.7).
There
are
ve
factors
which
contribute to
the return
loss
uncertainty:

Dynamic
accuracy

Sweep-to-sweep
repeatability

P
olarization
sensitivity

Amplitude
atness
versus
mirror
position

Dispersion
(1550
nm
only)
Dynamic
accuracy
dominates
the
uncertainty
near
the
noise
oor
and
becomes
increasingly
less
signicant
at
higher
signal
levels
.
The specied
uncertainty
does not
include the
connector
loss
or
the
calibration
standard
uncertainty
.
The
return-loss
uncertainty
graph for
the
1550
nm
source
applies
to
the
mirror
position
range
of 0
to
100
mm.
The
uncertainty
is
degraded
near
0
80
dB
for
mirror
positions between
100 and
400
mm
due
to
dispersion
eects
.
Refer
to
\Characteristics"
in
this
chapter
for
information
on
the
noise
oor
.
Specication
Return
loss
uncertainty
specication
applies with
minimum span,
averaging
on,
and the
averaging factor
set
to
50.
F
or
1300
nm,
the
minimum
span
is
1
mm.
For
1550 nm,
the
minimum
span
is
1.2
mm.
F
or
1550
nm,
dispersion
correction
must be
enabled and
the
specication
applies
over
the
0
to
100
mm
mirror position
range.
6-6
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