HP 8903 Software Software for the HP 8903 Audio Analyzer NEW 2/5/15 - Uploaded fixed programs, thanks to Shawn Gibson! Before the Audio Precision box became the de facto standard for audio testing, there was the HP 8903. The 8903 was available in three versions that I've seen: the 8903A, 8903B, and 8903E. The A and B versions include a low-distortion oscillator (source), whereas the E version does not. The A or B versions are certainly more useful for audio testing, and are required to run the software I've written. The B version included a few enhancements (like programmable generator source impedance), but for the most part the A and B can be considered equals.
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HP 8903A and 8903B analyzers are plentiful and relatively inexpensive on the used market. I bought an 8903A freshly calibrated from a rental company for about $900. A recent look on eBay showed 13 of them, selling for buy-it-now prices of between $549 and $1699, depending on condition, calibration, guarantee, etc. How To Install Hp Laserjet 1000 On Windows 7 there.
Compare this to an boxes selling for $3000-$5000 in the used market, and the old HP 8903 is a bargain. OK, the HP 8903 does not do everything that an AP box does. The most important thing it won't do for you, at least for me, is an FFT. Bluetooth Driver For Hp Probook 4530s.
But since an FFT is a relative measurement - no precise absolute voltage measurement is needed - a good sound card can perform at about the same level as an AP box. I use an and software to do FFTs, and the 8903 as the source. I get a noise floor of around -140dB. The AP boxes at work have about the same noise floor. And Audiotester is a lot easier to use than the brain-damaged application that runs the AP box.
Sorry, Audio Precision. But my biggest issue with the 8903 was that you cannot easily get plots - swept measurements - from it.
To measure frequency response, I had to manually enter the frequency and write down the measurement (or enter it into a spreadsheet) to get a graph. That is painful. However, the 8903 can be fully operated remotely through the GPIB port.