Hewlett Packard 8903A Analyzer
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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.
Service and User Manual
20.62 Mbytes (21623124 Bytes)
Scanned document, all readable.
2015 05 31
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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