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Test Instruments DSO

Draw mode

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100 s/Div.

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Channel B

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Multimeter

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This signal via the adapter leads is slightly falsi- fied by interfering fields, e. g. the ignition cables. However, the falling trend on warming-up of the engine can be recognized.

The voltage curve shows the change in tempera- ture of the engine or coolant from approx. 10 °C up to 90 °C.

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Exact judgement of the engine temperature sender is possible using the resistance charac- teristic from the corresponding workshop manual. The characteristic shows the corresponding resistance value of the sender depending on the temperature. The sender is OK if the resistance value is within the shaded area.

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