Low Cost 50MHz Frequency Meter by John Clarke
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EPE Magazine September 2006

** updated 8th March 2007 **

An accurate autoranging design with the following features:

Based on PICmicro PIC16F84-04/P

Input sensitivity < 20mV rms 1Hz-100kHz rising to 50mV at 20MHz and 85mV at 50MHz.

Impedance 1.1M in parallel with ~ 10pF

Accuracy +/- 20 ppm  equivalent to 1 kHz at 50 MHz.

8 digit LCD readout

Automatic Hz/ kHz or MHz indicators

Two resolution modes

0.1Hz resolution up to 150 Hz

1Hz resolution maximum up to 16MHz (10Hz > 16MHz)

Battery or DC plugpack.


Parts are available from the usual component sources. Please note
that EPE does not provide kits but many of the requirements can
be met by our advertisers.

The latest version of the software is available from
ftp://ftp.epemag.wimborne.co.uk/pub/PICS/Frequency Meter 50MHz

Please refer to the EPE web site for details of ordering back issues, subscriptions etc.
http://www.epemag.wimborne.co.uk

Last updated 8th MArch 2007