HP 8901B

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 ............................................................. HP 11715A
Audio Analyzer
................................................................... HP 8903B
Audio Synthesizer..
............................................................... HP 3336C
HP 89016
1 ~ MODULATION ANALYZER
OUTPUT
h (Slap
Iy-1 ;;g; 000000 ::Egg 0000 0 0 (Slap 10) INPUT AUDIO ANALYZER
UODULAT I ON
AUDIO INPUT
0
0 0 000000 00000 0
AMI FY
OUTPUT
I I
I
I
HP 11715A I
AMIFM TEST SOURCE
Figure 4-1. AM Performance Test Setup
NOTE
In the following procedure the RF modulation source can be connected
either to a sensor module (which
is connected to the Modulation Analyzer)
or directly to the Modulation Analyzer’s INPUT connector. The procedure
is 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 up for at
least one-half hour.
Performance Test 1 4-3