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Make
sure
the
span
is
not
too
narrow
.
This
may
cause
interpolation
errors
with
the
default
or
full-band
calibrations
.
P
erform
a
user-dened
calibration
at
the
desired
frequency
range
.
Mismatch
errors
can
cause
inaccuracies
up
to
a
few
tenths
of
a
dB
.
This
is
usually
noticeable
as
ripple
in
a
low-loss
transmission
display
and
is
typically
more
noticeable
in
an
HP
8711B/12B
than
in
an
HP
8713B/14B
.
Excessive
ripple
can
indicate
poor
source
or
input
match.
Measure
the
match
using
the
performance
tests
.
If
OK,
try
using
attenuators
to
improve
match.
Receiver
P
ower
Problems
Check
all
cables
and
cable
connections
on
the
receiver
board;
tighten
if
necessary
.
If
the
problem
is
caused
by
a
power
hole
,
try
moving
the
cables
to
see
if
the
power
hole
moves
or
disappears
.
If
it
does
,
the
cable
is
probably
defective
.
If
the
analyzer
has
a
step
attenuator
and
the
problem
only
occurs
with
the
attenuator
engaged
(<0
dBm
for
the
HP
8711B/12B
and
<05
dBm
for
the
HP
8713B/14B),
replace
the
step
attenuator
assembly
.
Otherwise
,
replace
the
A5
receiver
assembly
.
T
roubleshooting
and
Block
Diagrams
4-23
Содержание 87114B
Страница 7: ......
Страница 19: ...Absolute Power Accuracy broadband Dynamic Accuracy narrowband 1 4 Performance T ests ...
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Страница 118: ...Figure 5 1 The Service Key Menus 5 2 Service Related Menus ...
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