handheld cameras .... protocols and rules..
Discussion
70proof said:
Hi, handheld units.....
Should there be warnings within a set distance first
How do they work, is is plate photo taken too
What are the rules re calibration etc
No warnings are required.Should there be warnings within a set distance first
How do they work, is is plate photo taken too
What are the rules re calibration etc
Sometimes images of the plate are taken, sometimes not and they will be written down.
Calibration is normally an annual routine but it is not absolutely required. If by chance the device was not calibrated and you challenged it they could get a calibration and inspection done to measure the accuracy of the instrument at the time of your challenge; the state of accuracy at the time of the measurement can then be established.
Here's a link for the professional guidance issued to the police by ACPO: http://www.acpo.police.uk/documents/uniformed/2011...
70proof said:
Single non traffic officer with a handheld gun, in a layby/rest area of a dual carriageway, no cars further down, no one being pulled over, no tripods etc... Hence question on my part
A lot of people use the term "speed camera" when they mean "speed gun / laser speed meter" - these are completely different things - both are used to measure distances - and from those measurements a calculation of speed is made. A GATSO is a speed camera. A ProLaser III is a laser "gun". http://kustomsignals.com/products/product/pro_lase...agtlaw said:
A lot of people use the term "speed camera" when they mean "speed gun / laser speed meter" - these are completely different things - both are used to measure distances - and from those measurements a calculation of speed is made. A GATSO is a speed camera. A ProLaser III is a laser "gun". http://kustomsignals.com/products/product/pro_lase...
i know that is calculates speed, that why i asked about whether they have picture capability also.... if not, then how do you get a ticket if you are not pulled over.agtlaw said:
A lot of people use the term "speed camera" when they mean "speed gun / laser speed meter" - these are completely different things - both are used to measure distances - and from those measurements a calculation of speed is made. A GATSO is a speed camera. A ProLaser III is a laser "gun". http://kustomsignals.com/products/product/pro_lase...
It may be clearer to explain it like this:- SPEEDMETER without camera - an instrument to measure, display and sometimes store the speed of a motor vehicle
- SPEEDMETER with camera (a.k.a. SPEED CAMERA) - an instrument to measure, display and store the speed of a motor vehicle in an image or images
70proof said:
i know that is calculates speed, that why i asked about whether they have picture capability also.... if not, then how do you get a ticket if you are not pulled over.
Notice of Intended Prosecution and request for driver details in the post.In short, they don't need photographic evidence or to have stopped you at the time.
pitmansboots said:
If by chance the device was not calibrated and you challenged it they could get a calibration and inspection done to measure the accuracy of the instrument at the time of your challenge; the state of accuracy at the time of the measurement can then be established.
Here's a link for the professional guidance issued to the police by ACPO: http://www.acpo.police.uk/documents/uniformed/2011...
A calibration is like an mot, it only tells you the state of the equipment at the time of the test. You can however use a calibration history to draw some conclusions about the stability of a piece of equipment. Providing the unadjusted output has remained stable over several calibrations you can be reasonably certain that the performance remained the same at any point between calibrations. Here's a link for the professional guidance issued to the police by ACPO: http://www.acpo.police.uk/documents/uniformed/2011...
I have simplified this somewhat, the key point is that if any physical adjustments are made during or as a result of a calibration then your ability to make claims about intermediate performance becomes uncertain. You can apply a software correction after calibration providing the calibration is carried out on uncorrected output.
The LTI2020 calibration schedule I found online, for example, allows adjustments prior to calibration therefore it is not possible for a calibration based on this procedure to make any claims about prior performance.
Toltec said:
pitmansboots said:
If by chance the device was not calibrated and you challenged it they could get a calibration and inspection done to measure the accuracy of the instrument at the time of your challenge; the state of accuracy at the time of the measurement can then be established.
Here's a link for the professional guidance issued to the police by ACPO: http://www.acpo.police.uk/documents/uniformed/2011...
A calibration is like an mot, it only tells you the state of the equipment at the time of the test. You can however use a calibration history to draw some conclusions about the stability of a piece of equipment. Providing the unadjusted output has remained stable over several calibrations you can be reasonably certain that the performance remained the same at any point between calibrations. Here's a link for the professional guidance issued to the police by ACPO: http://www.acpo.police.uk/documents/uniformed/2011...
I have simplified this somewhat, the key point is that if any physical adjustments are made during or as a result of a calibration then your ability to make claims about intermediate performance becomes uncertain. You can apply a software correction after calibration providing the calibration is carried out on uncorrected output.
The LTI2020 calibration schedule I found online, for example, allows adjustments prior to calibration therefore it is not possible for a calibration based on this procedure to make any claims about prior performance.
pitmansboots said:
Toltec said:
pitmansboots said:
If by chance the device was not calibrated and you challenged it they could get a calibration and inspection done to measure the accuracy of the instrument at the time of your challenge; the state of accuracy at the time of the measurement can then be established.
Here's a link for the professional guidance issued to the police by ACPO: http://www.acpo.police.uk/documents/uniformed/2011...
A calibration is like an mot, it only tells you the state of the equipment at the time of the test. You can however use a calibration history to draw some conclusions about the stability of a piece of equipment. Providing the unadjusted output has remained stable over several calibrations you can be reasonably certain that the performance remained the same at any point between calibrations. Here's a link for the professional guidance issued to the police by ACPO: http://www.acpo.police.uk/documents/uniformed/2011...
I have simplified this somewhat, the key point is that if any physical adjustments are made during or as a result of a calibration then your ability to make claims about intermediate performance becomes uncertain. You can apply a software correction after calibration providing the calibration is carried out on uncorrected output.
The LTI2020 calibration schedule I found online, for example, allows adjustments prior to calibration therefore it is not possible for a calibration based on this procedure to make any claims about prior performance.
pitmansboots said:
Pre-calibration wouldn't be performed unless it was required in the circumstances described above.
So unless someone complains a system that needs significant adjustment to be brought back into specification would not have that requirement recorded. To put it another way there is basically no continuous calibration history?It is quite possible that a particular system is quite stable, however it does not sound like there is any way you can prove that.
Yes, I know I am being rather pedantic about this, the reason being that I used to build and calibrate optical test equipment for a living. On the particular systems I worked on getting details like this right tended to be a bit important because lives could depend on it.
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