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| Thread ID: 78476 | 2007-04-17 02:58:00 | Wife got another speeding ticket | Strommer (42) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 541734 | 2007-04-22 08:54:00 | The metrology used for the calibration should establish the accuracy and repeatability under the defined condition, the device also has to have a stabilty of operation inherent in the design over the operating temperature range it will encounter under normal (and designed for) use. That is called the Class Accuracy of the device. That is common and standard in any metrology. The calibration assures that it remains within Class. To not do so would mean the device is faulty. The Police have an ISO 17025 accredited Laboratory, that will be annually (or 6 monthly) independently assessed by IANZ, IANZ take no prisoners when it comes to accuracy and processes. The Police lab accuracy limits (of test) are +/- 0.64 kM/h for radar and laser devices, +/- 0.57 km/h for static speed cameras. The manner that these devices operate should make them quite stable and easily tested as well. It's not rocket science. By far the inaccuracies will come from returned signals from other than the vehicle attributed to, rather than basic accuracy of the device. I base my speed on my in-car GPS unit, which shows the speedo to be 4 kM per hour fast at 100 kM/h. That 4 km/h fast error (new tyres) is typical of the cars I have owned. |
godfather (25) | ||
| 541735 | 2007-04-22 09:10:00 | I fail to see what the weather has to do with calibrating anything. | Cicero (40) | ||
| 541736 | 2007-04-23 03:40:00 | I fail to see what the weather has to do with calibrating anything. But that just suggests you have never calibrated anything. The accuracy is determined in a controlled environment. The unit operates in an uncontrolled environment. The equipment design must be capable of maintaining the accuracy over the operating temperature (e.g. the weather) and given the milspec type construction, unless the units were faulty, they should cope with weather extremes (temperature) easily and remain within class. As to them being operated competently, that is another issue... |
godfather (25) | ||
| 541737 | 2007-04-23 03:52:00 | Is anybody being sneaky about "metrology" ? ;) It would be sad to have let it slip away neglected. |
R2x1 (4628) | ||
| 541738 | 2007-04-23 03:53:00 | Funny enough . . I worked with a wheel-driven dynomometer in a shop for many years . You'd be amazed at the number of people who wanted to test and therefor calibrate their vehicle's speedometer . Most times this was for a defense in traffic court . Alas, it was all for naught . The Federal regs here in the US state nowhere that the devices have to be accurate for the purposes of speed limits and defense thereof . The judge always threw the case to the police as there is no law requiring a speedometer be installed in any vehicles for the purpose of control of road speed . They are considered an accessory, possibly for self amusement or just filling a hole in the dashboard . . . and not a calibrated instrument . |
SurferJoe46 (51) | ||
| 541739 | 2007-04-23 03:54:00 | Is anybody being sneaky about "metrology" ? ;) It would be sad to have let it slip away neglected. Hmmm...seems un-neglected now doesn't it ? :thumbs: :xmouth: |
SurferJoe46 (51) | ||
| 541740 | 2007-04-23 04:14:00 | Is anybody being sneaky about "metrology" ? ;) It would be sad to have let it slip away neglected. I thought you might get the play on metrology and meteorology,seems some can't see the wood for the trees. |
Cicero (40) | ||
| 541741 | 2007-04-23 04:20:00 | Metrology: The study of measurement involves measuring quantities, calibration of instruments, and determining the uncertainty of a measurement. |
godfather (25) | ||
| 541742 | 2007-04-23 04:44:00 | Lucky you! My missus often reads my threads here when I'm not around to see what's been on my mind! (Usually to see what the . . . . I've done this time to get myself banned!) :lol: (Hi Missus Greg!) :p Hi Mrs Greg . . . . . . . . . . . from Maryann & Poppa John . |
Poppa John (284) | ||
| 541743 | 2007-04-25 01:21:00 | I thought you might get the play on metrology and meteorology,seems some can't see the wood for the trees. Metrology: The study of measurement involves measuring quantities, calibration of instruments, and determining the uncertainty of a measurement. lol |
motorbyclist (188) | ||
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