Automotive Manual PDF

In an age when there is growing tension between customer expectations of high engine performance, low fuel consumption and compliance with the legal requirements on the emission of airborne pollution, the ability of a vehicle to meet the most stringent emission standards is becoming an increasingly important aspect of its market appeal.
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The warning lights described on this page should never be on when driving. When the ignition is turned on, and before the engine starts, all of the warning lights should be on to test the function of the bulbs. Should a light not go off after the engine has started, the system indicated should be inspected. (However, the parking brake reminder light will not go off until the parking brake is fully released.)
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VW Embedment Strain Gauges are used to measure strain in reinforced concrete and mass concrete.
Operation
The body of the strain gauge is a steel tube with flanges at either end. Inside the body, a steel wire held in tension between the two flanges. Strain in the concrete causes the flanges to move relative to one another, increasing or decreasing the tension in the wire.
The tension in the wire is measured by plucking the wire with
electromagnetic coils and measuring the frequency of the resulting vibration. Strain in the wire is calculated by squaring the frequency reading and multiplying a gauge factor and a batch calibration factor.
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