Multifunction Frequency Meter
Despite its surprisingly simple hardware design and construction, the superb frequency meter / event counter described in this article couples ease of use to a plethora of measurement options. The successful combination is mainly due to the use of a microcontroller running some really ingenious software. The keywords in the general design of the instrument were noise immunity, reliability and functionality.A frequency meter / event counter is an indispensable instrument on the electronics laboratory workbench. In general, the basic circuit of the instrument is not particularly complex. Digital integrated circuits have been available for quite some time that are capable of performing frequency and time measurements, as well as pulse counting. The same ICs also cheerfully handle the job of displaying measurement results on an LC or LED display. These days, counters are just ‘add-ons’ to function generators and get the matching amount of attention!