Model 8901B Operation
23.0
23.1
23.2
24.0
24.1
24.2
24.3
24.4
24.5
24.6
24.7
24.8
24.9
Additional Special Functions
for
Single-Sideband Noise
These special functions enable you to change
and
display
the
noise measurement bandwidth. The noise
measurement bandwidth is measured and entered at
the
factory
and
probably does not need
to
be
remeasured unless operating conditions for
the
Modulation Analyzer change radically.
1.
Special Function
24.8
Changes
the
noise measurement
bandwidth
used
in
single-sideband noise
measurements. The
value
entered
(in
units of MHz) must be between
100
Hz
and
20 kHz
(0.0001
and
0.02 MHz).
To
enter
a noise measurement bandwidth key
in
24.8 SPCL then
key
in
the
bandwidth expressed
in
MHz
and
press the MHz key. This factor
is
stored
in
non-volatile memory.
Determination of
the
noise measurement bandwidth is usually done
by
numerical integration of
the
IF
filter response.
2.
Special Function
24.9
Displays
the
value of
the
noise measurement
bandwidth
used
in
conjunction
with
Special Function 24.7.
The
displayed value times out
after
a few seconds.
~~ ~
Sets the LO to internal.
Sets the LO to external.
Displays the status of the LO: (O=lnternal,
1
=External)
Sets the Modulation Analyzer to the Selective Power
Measurement Mode.
Selects the wide-bandwidth IF filter for adjacent-
channel or cellular radio power measurements. Dis-
plays the IF level (in volts).
Establishes the level measured with
24.1
SPCL as
the
0
dB reference.
Selects a narrower bandwidth IF filter than
24.1
SPCL
for adjacent channel power measurements. Displays
the IF level (in volts).
Establishes the level measured with
24.3
SPCL as
the
0 dB reference.
Selects a very narrow bandwith IF filter
(2.5
kHz)
for the single-sideband noise measurement. Displays
the IF level (in volts).
Establishes the level measured with
24.5
SPCL as
the
0 dB reference.
Displays the noise measurement as normalized to a
1
Hz
bandwidth.
Enables setting of the value of the noise measure-
ment bandwidth.
Displays the value
of
the noise measurement
bandwidth.
Summary
of
Special
finctions
23
and
24
I
SPCL
I
SDecial Function DescriDtion
Comments
1
The display times out after a few seconds.
This special function must be selected before any
selective power measurements can be made.
Used with
24.2
SPCL.
The bandwidth of the IF is determined by the Option
Series
030 Filter installed.
Used with
24.4
SPCL.
Used with
24.6
SPCL.
Can only be used with Option
037.
Can only be used with Option
037.
Can only be used with Option
037.
Can only be used with Option
037.
Can only be used with Option
037.
MEASUREMENT TECHNIQUE
The
Series 030 Options add more
IF
signal processing circuitry to
the
Modulation Analyzer including
programmable
IF
amplifiers
and filters
and
a
true
rms
IF
detector.
(Refer
to the Selective Power
Measurement Option simplified block diagram.)
Selective Power Measurements (Option
030)
3-99
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