Model 8901B Operation
DETAILED DESCRIPTIONS
OF
ALL SPECIAL FUNCTIONS
1.
RF Input Attenuation.
Use this special function
to
select
FW
input attenuation
to
eliminate input
overload or
to
improve measurement sensitivity.
For
more details about this function, refer
to
RF Input
Attenuation
on page 3-231.
1.0 Automatic selection
1.1
Attenuation of
0
dB
1.2 Attenuation of 10
dB
1.3 Attenuation of 20
dB
1.4 Attenuation of 30
dB
1.5 Attenuation
of
40
dB
1.6 Attenuation of
50
dB
2.
Audio Range Selection.
Use this special function
to
set the display resolution for modulation
measurements. The Modulation Analyzer’s display resolution is dependent on the modulation being
measured and the detector being used. For example, in
FM
measurements, Special kction 2.4 can
only display 0.01
Hz
resolution when the deviation being measured
is
less than 0.04 peak
kHz
and
when the RMS detector
is
selected. Because this special function
is
so
complex, it
is
not described in
detail here. Refer
to
Audio Range
on page
3-183,
for detailed tables for this function.
3.
RF and IF Filters.
Use this special function
to
change the Modulation Analyzer’s
RF
and
IF
filters. (Refer
to
Filters, RF and IF
on page 3-229 for information about the usefulness of changing
these filters.)
IN
2.5
MHz
Low-
Pass
3.8 SPCL 3.8SP
455 kHz
5.
Audio Detector Response.
Use this special function
to
help stabilize measurements on unstable
or noisy signals when making modulation or
SINAD
measurements.’
5.0
Fast response time.
5.1
Slow
response time.
The slow response time for SINAD is not available with firmware
date
codes
234.1985
and
below. (To display the firmware
date
code, select
42.0
SPCL.)
To
order a
ROM
set that contains this special function, contact the nearest
HP
sales office.
3-241
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