Equipment information
Hewlett Packard 8903A Analyzer
Manufacturer:
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Model:
8903A
Date:
1981
Category:
Group:
Description:
Information
The HP Model 8903A Audio Analyzer is a complete audio
measurement system covering the frequency range of 20 Hz to
100 kHz. It combines a low-distortion signal source with a
signal Analyzer. The Analyzer can perform distortion
analysis, frequency count, and ac level, dc level, SINAD,
and signal-to-noise measurements. The Audio Analyzer reduces
the number of instruments required in many applications
involving audio signal characterization.
The Audio Analyzer is easy to use. All measurements are
selected by one or two keystrokes. For distortion
measurements, the Audio Analyzer automatically tunes to and
levels the input signal. Measurement and output ranges are
automatically
selected for maximum resolution and accuracy. Furthermore,
tuning is independent of the source. Thus, the source can be
set to one frequency while the Analyzer is measuring the
distortion on a signal at another frequency (i.e., there is
no need to tune the Analyzer to the source).
The combined capabilities of the instrument are enhanced by
microprocessor control, resulting in more capability than
would be available from separate instruments. For example,
when making signal-to-noise measurements, the Audio Analyzer
monitors the ac input level while turning the source on and
off. The microprocessor then computes and displays the ratio
of the on and off levels. The ratio can be displayed in
either % or dB. In addition, the source can be swept. This
makes measurements such as frequency response or complete
distortion characterization simple to perform.
Microprocessor control allows flexible entry of source
parameters and versatile display formats. For example, ac
level can be displayed in V, mV, dBV, watts, or as a ratio
(in % or dB) referenced to an entered or measured value.
Virtually all functions are remotely programmable through
the Hewlett-Packard Interface Bus (HP-IB1). Programming is
easy and straightforward, and all measurements are made
through a single input connector. This eliminates the need
to switch between multiple inputs under remote control and
reduces Software development time and hardware costs.
The Audio Analyzer measures the true rms level on all
measurements. True rms measurements assure greater accuracy
when measuring complex waveforms and noise. Accurate
distortion measurements typically can be made to less than
0.003% (-90 dB) between 20 Hz and 20 kHz at a IV level.
Manual Type:
Service and User Manual
Pages:
450
Size:
20.62 Mbytes (21623124 Bytes)
Language:
english
Revision:
Manual-ID:
08903-9002
Date:
Quality:
Scanned document, all readable.
Upload date:
2015 05 31
MD5:
971ed64ed3afec258f803a48fc11b30c
Downloads:
1542
Information
THIS MANUAL COVERS A SPECIAL MODIFICATION OF THE INSTRUMENT.
This manual applies directly to instruments with serial
numbers prefixed 2016A.
With changes described in Section VII, this manual also
applies to instruments with serial numbers prefixed 1942A
and 2006A.
This manual contains information required to install,
operate, test, adjust, and service the Hewlett-Packard Model
8903A Audio Analyzer. The Audio Analyzer is shown in Figure
1-1 with all of its externally supplied Accessories. This
manual also documents Audio Analyzers supplied with Option 001.
This section of the manual describes the instruments
documented by the manual and covers instrument description,
options, accessories, specifications, and other basic
information. This section also contains principles of
operation on a simplified block diagram level and basic
information on audio measurements. The other sections
contain the following information:
Section II, Installation: provides information about initial
inspection, preparation for use (including address selection
for remote operation), and storage and shipment.
Section III, Operation: provides information about panel
features, and includes operating checks, operating
instructions for both local and remote operation, and
maintenance information.
Section IV, Performance Tests: provides the information
required to check performance of the instrument against the
critical specifications in Table 1-1.
Section V, Adjustments: provides the information required to
properly adjust the instrument.
Section VI, Replaceable Parts: provides ordering information
for all replaceable parts and assemblies.
Section VII, Manual Changes: provides manual change
information necessary to document all serial prefixes listed
on the Service Manual title page.
Section VIII, Service: provides the information required to
repair the instrument.
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