HP 8901B Operation And Calibration Manual page 213

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 t o change
and
display
the noise measurement bandwidth. The noise
measurement bandwidth i s measured and entered a t the factory
and
probably does n o t 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 o f MHz) must be between
100 H z and 20 k H z (0.0001
and
0.02 MHz).
To
enter a noise measurement bandwidth key
i n
24.8 SPCL then key in the
bandwidth expressed in M H z
and
press the M H z key. This factor
is
stored
i n
non-volatile memory.
Determination o f the noise measurement bandwidth is usually done by
numerical integration o f
the
I F
filter response.
2.
Special Function
24.9
Displays t h e value o f 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 t o
t h e Modulation Analyzer including
programmable
IF
amplifiers and filters
and
a t r u e
r m s
IF
detector. (Refer t o the Selective Power
Measurement Option simplified block diagram.)
Selective Power Measurements (Option
030)
3-99