HP 8901B Operation And Calibration Manual page 343

Model 8901B Performance Tests
Description
AM accuracy is measured with the internal AM Calibrator, which produces approximately 33% AM
at a 10 kHz rate.
A
low-residual AM source is connected
to
the input and the internal residual AM
is measured. A source, which can produce wide-band, linear AM, is moddated at various AM rates
and depths to measure distortion, flatness, and incidental FM and cPM. A special AM/FM test source
is required for these tests
to
assure that the AM source has adequate bandwidth, low distortion, low
residual AM, and low incidental FM and OM.
Equipment
AMFM Test Source
.............................................................
H P 11715A
Audio Analyzer
...................................................................
H P 8903B
Audio Synthesizer..
...............................................................
H P 3336C
HP 89016
1
~
M O D U L A T I O N ANALYZER
OUTPUT
h
(Slap
I y - 1
;;g;
000000
: : E gg
0000
0
0
( S l a p 10)
INPUT
AUDIO ANALYZER
UODULAT
I
ON
AUDIO
INPUT
0
0 0
000000
0 0 0 0 0
0
A M I
FY
OUTPUT
I I
I
I
HP 11715A
I AMIFM T E S T SOURCE
Figure
4-1.
A M Performance Test Setup
NOTE
I n the following procedure the
RF
modulation source can be connected
either to a sensor module (which i s connected
to
the Modulation Analyzer)
or directly to the Modulation Analyzer's I N P U T connector. The procedure
i s written for the latter case.
Procedure
AM Accuracy at
10 kHz
Rate
1. On the Modulation Analyzer, press the blue key then press INSTR PRESET (the AUTOMATIC
OPERATION key) to preset the instrument. Connect the Modulation Analyzer's CALIBRATION
AMFM OUTPUT to its INPUT.
NOTE
For greatest accuracy, allow the Modulation Analyzer to warm u p for at
least one-half hour.
Performance Test
1
4-3