If
This
T
est
F
ails
Check
the
detector's
input
connector
to
make
sure
there
is
no
damage
.
Open
the
detector's
case
and
check
the
connection
between
the
input
connector
and
the
PC
board.
Check
that
the
detector
is
connected
securely
to
the
front
panel
of
the
analyzer
.
Replace
the
connector
if
necessary
.
If
the
detector
still
fails
,
refer
to
the
\Service"
chapter
for
more
troubleshooting
information.
Frequency
Response
P
erformance
T
est
Description
The
frequency
response
of
the
85025A/B/D/E
detector
is
specied
as
the
maximum
peak-to-peak
deviation
from
a
constant
input
signal
level
of
010
dBm ,
as
measured
over
the
specied
frequency
range
.
At
Agilent
T
echnologies
,
frequency
response
is
measured
with
the
use
of
an
automated
test
station
traceable
to
the
U
.S.
National
Institute
of
Standards
and
T
echnology
(NIST).
The
\frequency
response"
specication
for
the
85025
family
of
detectors
may
more
properly
be
called
\frequency
response
atness
."
The
test
for
frequency
response
does
not
check
absolute
gain
of
the
detector
across
its
operating
frequency
range
.
It
checks
the
relative
variations
in
gain
across
the
operating
frequencies
(for
example
,
atness).
T
o
simplify
the
measurement
procedure
,
frequency
response
is
measured
with
a
nominal
010
dBm
signal
applied.
First,
the
source
is
characterized
for
frequency
response
using
a
calibrated
power
meter/sensor
combination.
Next,
the
DUT
is
characterized.
Finally
,
a
point-by-point
dierence
is
computed,
plotted
and
compared
to
the
specication
window
.
Dierences
in
the
values
recorded
due
to
the
dierent
measurement
scheme
should
be
negligible
.
The
manual
test
described
in
this
procedure
has
an
approximate
root
sum
of
the
squares
(RSS)
uncertainty
ranging
from
60.19
dB
to
60.37
dB
for
85025A/B/E
detectors
and
60.12
dB
to
60.76
dB
for
85025D
detectors
.
This
implies
that
a
\good"
detector
,
well
within
the
limits
of
its
specications
,
could
measure
out
of
specications
.
This
measurement
is
only
an
indication
of
the
detector's
response
within
these
limits
.
If
greater
measurement
accuracy
is
desired,
a
test
system
that
minimizes
Agilent
85025A/B/D/E
P
erformance
T
ests
4-9
Summary of Contents for 85025A
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