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Model 8902A
*
Characteristic
Performance Limits
Conditions
AMPLITUDE MODULATION
Performance Tests
FM Rejection(2)
I
<0.2%
AM
~
<0.2%
AM
250 kHz to 10 MHz carrier;
<5
kHz peak deviation;
400 and 1000 Hz rates;
50 Hz to 3 kHz bandwidth
10 to 1300 MHz carrier;
<50
kHz peak deviation;
400 Hz and 1 kHz rates;
50 Hz to 3 kHz bandwidth
I
I
(2)
Peak residuals must be accounted for in peak readings. (Refer to
Residual Noise Effects
in
Detailed
Operating Instructions in
Section 3.)
Description
FM is measured with a very low-noise oscillator at the Measuring Receiver's input. The resulting
measured FM is the residual FM of the Measuring Receiver's internal local oscillator. FM accuracy
is measured with the internal FM Calibrator, which produces approximately 34 kHz peak deviation
at a 10 kHz rate. A source, which can produce wide-band, linear FM, is modulated at various FM
rates and deviations to measure distortion, flatness, and incidental AM. A special AM/FM test source
is required for these tests to assure that the FM source has adequate bandwidth, low distortion, low
residual FM, and low incidental AM.
Equipment
AM/FM Test Source
............................................................
HP
11
715A
Audio Analyzer..
................................................................
H P 89038
Audio Synthesizer
................................................................
HP 3336C
CAI
HP
8902A
MEASURING RECEIVER
~
_._
~
0
W D U L A T I D N
OUTPUT/
AUDlO
INPUT
OUTPUT
: g : :
000000
0000
0
AUDIO ANALYZER
gggg
0
( S t a p 1 5 )
INPUT
0
0
0
0 0
nooooo
0
0000
0
AMIFM
OUTPUT
1
I
HP 11715A
AMIFM TEST SOURCE
1
( S t e p 31
.
LOW RESIDUAL OUTPUT
FM+4
OUTPUT
AUDIO SYNTHESIZER
7
( S t e p s 7 . 3 0 )
I
OUTPUT
4-9
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