A digital low frequency spectrum analyzer, using a programmable pocket calculator

A measuring instrument utilising the Texas Instruments' appliances SR 52 or SR 56 is described. An application as a dig~tal 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 [lJ, for which the author designed and tested print lay-outs.