(SR-52) Digital Low Frequency Spectrum Analyzer

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An excerpt from A digital low frequency spectrum analyzer, using a programmable pocket calculator, Spruit, W. P. (1978). (EUT report. E, Fac. of Electrical Engineering; Vol. 78-E-85). Eindhoven: Technische Hogeschool Eindhoven.

Abstract:
A measuring instrument utilising the Texas Instruments' appliances SR 52 or SR 56 is described. An application as a digital noise measuring system is discussed in detail. The same instrument can, however, perform other functions. Results concerning sine-wave and noisy input signals are presented.
The instrument makes use of an input-output processor for the SR 52/56, developed by verkroost, for which the author designed and tested print lay-outs.

"INTRODUCTION
  The tremendous popularity of the pocket calculator has made it a really versatile piece of computing apparatus, and compared to other arithmetical hardware, the price is very low.
  The use is, however, restricted, because it is designed to be man-operated. It could be used as a micro-computing element in intelligent measuring equipment, if it were possible to feed it directly with digital signals, and read out the results directly, too.
  This problem has been solved largely by Verkroost. He designed an input/output processor for the SR 52 and SR 56 programmables. The author made prints for this processor andJwith the help of these, built an automatic measuring instrument."

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[johanw]

Nice, one from my Alma Mater (10 years before I started there as a student).