1) "Speedometer" -- As to speedometer calibration
speed·om·e·ter
Pronunciation: spi-'dä-m&-t&r
Function: noun
1 : an instrument for indicating speed : TACHOMETER
2 : an instrument for indicating distance traversed as well as speed of travel; also : ODOMETER
Pronunciation Symbols

Speedometer gauge on a car, showing the speed of the vehicle in miles and kilometres per hour on the outā€“ and inside respectively. Also shown is the gear indicator and the tachometer, which displays the engine's rotative speed.
A speedometer is a vehicle instrument that measures the instantaneous speed.

Traditional automotive speedometers are driven by a flexible, sleeved cable that is rotated by a set of small gears in the tail shaft of a transmission. The early Volkswagen Beetle and many motorcycles, however, use a cable driven from a front wheel.

The most common form of speedometer relies on the interaction of a small permanent magnet affixed to the rotating cable with a small aluminum cup affixed to the shaft of the pointer. As the magnet rotates near the cup, the changing magnetic field produces eddy currents in the cup, which themselves produce another magnetic field. The effect is that the magnet 'drags' the cup--and thus the speedometer pointer--in the direction of its rotation with no mechanical connection between them.

The pointer shaft is held toward zero by a fine spring. The torque on the cup increases with the speed of rotation of the magnet (which, recall, is driven by the car's transmission.) Thus an increase in the speed of the car will twist the cup and speedometer pointer against the spring. When the torque due to the eddy currents in the cup equals that provided by the spring on the pointer shaft, the pointer will remain motionless and pointing to the appropriate number on the speedometer's dial.

The return spring is calibrated such that a given revolution speed of the cable corresponds to a specific speed indication on the speedometer. This calibration must take into account several factors, including ratios of the tailshaft gears that drive the flexible cable, the final drive ratio in the differential, and the diameter of the driven tires. The speedometer mechanism often also drives an odometer plus a small switch that sends pulses to the vehicle's engine computer.

Another early form of mechanical speedometer relies upon the interaction between a precision watch mech..."

2) "Calibration" -- As to speedometer calibration
cal·i·bra·tion
Pronunciation: "ka-l&-'brA-sh&n
Function: noun
1 : the act or process of calibrating : the state of being calibrated
2 : a set of graduations to indicate values or positions -- usually used in plural <calibrations on a gauge>
Pronunciation Symbols

Calibration refers to the process of determining the relation between the output (or response) of a measuring instrument and the value of the input quantity or attribute, a measurement standard. In non-specialized use, calibration is often regarded as including the process of adjusting the output or indication on a measurement instrument to agree with the value of the applied standard, within a specified accuracy. For example, a thermometer could be calibrated so the error of indication or the correction is determined, and adjusted (e.g. via calibration constants) so that it shows the true temperature in Celsius at specific points on the scale. Calibration also can refer to judgments made by a prognosticator, for example, a weather-forecaster who states that "there is an 80% chance of rain today," if properly calibrated, will say this on precisely 80% of the days during which it rains.

In the United States, the National Institute of Standards and Technology, a part of the federal government, maintains standards and is considered the arbiter and ultimate (in the U.S.) authority for values of SI units and industrial standards. NIST also provides traceability to its standards by calibration, by which an instrument's accuracy is established by comparing, in an unbroken chain, to higher level standards, e.g. the standards maintained by NIST. For each step in the process, the measurement uncertainty is evaluated.

In computing, an interactive whiteboard pen or other input method can be calibrated so that relation between the physical pen position and the position of the cursor on the screen is established and properly adjusted.

Calibration (stock removal)

Calibration (statistics)

Metrology

Color calibration - used to calibrate a computer monitor or display.

Scale test car - a device used to calibrate weighing scales that weigh railroad cars.

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Further Data On Term for speedometer calibration
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Regularly Occuring Typos with speedometer calibration include: pseedometer sepedometer speedometer spedeometer speeodmeter speedmoeter speedoemter speedomteer speedomeetr speedometre peedometer seedometer spedometer spedometer speeometer speedmeter speedoeter speedomter speedomeer speedometr speedomete apeedometer wpeedometer dpeedometer xpeedometer zpeedometer soeedometer spwedometer spsedometer spdedometer spredometer spaedometer spiedometer spoedometer spuedometer spewdometer spesdometer speddometer sperdometer speadometer speidometer speodometer speudometer speesometer speexometer speecometer speefometer speeeometer speetometer speedimeter speedkmeter speedlmeter speedpmeter speedameter speedemeter speedumeter speedoneter speedojeter speedoketer speedomwter speedomster speedomdter speedomrter speedomater speedomiter speedomoter speedomuter speedomerer speedomefer speedomeger speedomeyer speedometwr speedometsr speedometdr speedometrr speedometar speedometir speedometor speedometur speedometee speedometed speedometef speedometet aclibration claibration cailbration calbiration calirbation calibartion calibrtaion calibraiton calibratoin calibratino alibration clibration caibration calbration caliration calibation calibrtion calibraion calibraton calibratin calibratio xalibration dalibration falibration valibration kalibration cqlibration cslibration czlibration celibration cilibration colibration culibration cakibration caoibration capibration calubration calkbration calobration calabration calebration calubration calivration calinration caligration calihration calibeation calibdation calibfation calibtation calibrqtion calibrstion calibrztion calibretion calibrition calibrotion calibrution calibrarion calibrafion calibragion calibrayion calibratuon calibratkon calibratoon calibrataon calibrateon calibratuon calibratiin calibratikn calibratiln calibratipn calibratian calibratien calibratiun calibratiob calibratioh calibratioj calibratiom

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