HP 8753D Option 011 User Manual

11
Error T
erms
The
analyzer
generates
and
stores
factors
in
in
ternal
arra
ys
when a
measurement
error-correction
(measuremen
t calibration)
is p
erformed. These
factors are
kno
wn
b
y
the
follo
wing
terms:
error
terms
E-terms
measuremen
t
calibration
co
ecien
ts
The
analyzer
creates
error
terms
b
y
measuring
w
ell-dened
calibration
devices
o
v
er
the
frequency
range
of
in
terest
and
comparing
the
measured
data
with
the
ideal
mo
del
for the
devices.
The
dierences
represen
t
systematic
(rep
eatable) errors
of
the
analyzer
system.
The
resulting calibration
co ecien
ts
are
go
o
d
represen
tations
of
the
systematic
error
sources.
for
details
on
the
v
arious lev
els of
error-correction, refer
to the
\Optimizing
Measuremen
t
Results"
c
hapter
of
the
HP
8753D Option
011 Network
A
nalyzer
User's
Guide
.
F
ore
details
on
the
theory
of
error-correction,
refer
to
the
\Application
and
Op
eration
Concepts"
c
hapter of
the
HP
8753D
Option
011
Network
A
nalyzer
User's
Guide
.
Error
T
erms
Can
Also
Serv
e
a
Diagnostic
Purpose
Sp
ecic parts
of
the
analyzer
and
its
accessories
directly
con
tribute
to
the
magnitude
and
shap
e
of
the
error
terms.
Since w
e kno
w
this
correlation
and
w
e
kno
w
what
t
ypical
error
terms
lo
ok
like,
we
can examine
error terms
to
monitor
system
p
erformance
(prev
en
tiv
e
main
tenance)
or
to
iden
tify
fault
y
comp
onen
ts in
the system
(troubleshooting).
Prev
en
tiv
e
Main
tenance.
A
stable,
rep
eatable
system
should
generate
rep
eatable
error
terms
ov
er long
time in
tervals,
for
example,
six
mon
ths.
If
y
ou
mak
e
a
hardcop
y
record
(prin
t
or
plot)
of
the
error
terms,
you
can p
erio dically
compare curren
t
error
terms
with the
record.
A
sudden
shift
in
error
terms
reects
a
sudden
shift
in systematic
errors, and ma
y indicate the need for further troublesho oting. A long-term
trend often
reects drift, connector
and cable w
ear, or gradual degradation, indicating the need for
further in
vestigation and prev
entive main
tenance. Y
et, the system ma
y still
conform to
specications. The cure is often as simple
as cleaning and gaging connectors or insp ecting
cables.
Troubleshooting.
If a subtle failure or mild p erformance problem is
suspected, the
magnitude of
the error terms should b e compared against v
alues generated previously with
the same instrument and calibration kit. This comparison will pro duce the most precise
view of the problem.
However, if previously generated values are not available, compare the currentvalues to the
typical values listed in Table 11-2, and shown graphically on the plots in this chapter. If the
magnitude exceeds its limit, inspect the corresp onding system comp onent. If the condition
causes system verication to fail, replace the comp onent.
DRAFT
3/21/106 15:14
Error Terms 11-1
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HP 8753D Option 011 Specifications

General

Brand	HP
Model	8753D Option 011
Category	Measuring Instruments
Language	English