Announcement |
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| Authors: | JR Russell RF Lambourn |
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| Institution: | The Metropolitan Police Forensic Science Laboratory, 109 Lambeth Road, London SE1 7LP U.K. |
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| Abstract: | 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. |
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| Keywords: | Tachograph Calibration Substandard |
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