Calibration?

[empip]

...FAULTY speed cameras led to 59 motorists paying for speed awareness courses even though they hadn't been breaking the limit, it has been revealed.

Lancashire Police is set to refund the drivers, who paid to go on the day-long, £80 courses as an alternative to penalty point after being tickets by wrongly-set-up speed cameras...

...it has now emerged that speed guns were also wrongly calibrated over the seven-month period from February to September 2007, and multiple cameras have been affected...

...The member of staff involved has been temporarily moved to another department but is still employed by the police...

...The police watchdog is investigating why the cameras were calibrated wrongly by a member of staff at the Blackburn-based central processing unit...

I wonder which part of the device(s) is/are calibrated by a Police employee?? We know that the Gatsometer, double flash, time delay is adjustable on site ( dodgy at best )... But what else??
Surely calibration is carried out at specialist establishments - if not the maker?

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The flash delay time and calibration (radar component I guess).

...The time interval between photographs, typically 0.5 to 0.7 seconds, is derived from a timing source that is standalone. Therefore the resulting speed estimate is independent of that measured by the radar...

...The radar and camera are calibrated annually by the manufacturer, as called for in the Home Office Speed meter Handbook, with the user holding the resulting calibration certificates. Serco, the sole agent in the UK for the supply of Gatsometer B.V. radar speed enforcement equipment, retains copies of the issued certificates together with copies of the Gatsometer worksheets that record work undertaken during calibration. The calibration certificate forms part of police evidence and can, therefore, only be produced in a court of law...

No axe to grind whatsoever - just interested in this strange mish mash.