%0 Journal Article
%T A speed and frequency substandard for tachograph calibration equipment
%J Forensic science international
%D 1984
%A Russell, J. R.
%A Lambourn, R. F.
%V 24
%N 1
%P 81-86
%X The process of calibrating a tachograph makes use of a mechanical head drive unit and an electronic clock tester. Both these devices should be checked against a standard at 6-month intervals. The design of such a substandard, based on a highly stable 1 MHz crystal oscillator, is described.<p /> <p>Language: en</p>
%G en
%I Elsevier Publishing
%@ 0379-0738
%U http://dx.doi.org/