Microcomputer (Prinzipieller Aufbau von Mikroprozessoren, Grundlagen)

The accuracy of a frequency counter is determined exclusively by the accuracy of the timebase being used. Thus if extremely precise measurement of frequencies is required, as is the case for example when calibrating crystal oscillators, then a precision timebase is necessary. This can be achieved in a relatively simple manner, using the carrier wave signal of the 200 kHz broadcast transmitter at Droitwich.