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Model 8902A
Operation
24.1
Making the Single-Sideband Noise Measurement
11. If you want the measurement to be displayed as total power in the
2.5
kHz bandwidth,
go
to
12. Adjust the LO frequency by the desired offset to display the noise value. The value displayed
the next step. If
you
want the measurement to be normalized to
1
H z ,
select 24.7
SPCL.
is the single-sideband noise measurement result.
Measurement Mode.
Selects the wide-bandwidth IF filter for adjacent-
Additional Special Functions for Single-Sideband Noise
These special fiinctions 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 Measuring Receiver 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.
24.3
Sirmmary o f
Special
Firndions
23
and
24
0 d 5 reference.
Selects a narrower bandwidth IF filter than 24.1
Special
Function Description
Sets the LO t o internal.
Sets the
LO
t o external.
Displays the status of the LO: (O=lnternal, l=Exter-
nal).
Sets the Measuring Receiver to the Selective Power
I
24.2
channel or cellular radio power measurements. Dis-
plays the IF level (in volts).
Establishes the level measured with 24.1 SPCL as the
24.4
24.5
24.6
24.7
24.8
24.9
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 tvrrow 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 ai3 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.
Comments
I
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.
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