Download Air Conditioning and Refrigeration Repair by Roger Fischer, Ken Chernoff PDF

By Roger Fischer, Ken Chernoff

A standard feel advisor to keeping and repairing all kinds of cooling and refrigeration devices.

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Sample text

5 mm? Thirdly the ruler may have stretched and not give the correct reading! The first and second of these issues can be dispensed with by knowing how to read the test equipment correctly and also knowing the appropriate level of accuracy required. A micrometer for a plug gap? A ruler for valve clearances? I think you get the idea. The accuracy of the equipment itself is another issue. Accuracy is a term meaning how close the measured value of something is to its actual value. For example, if a length of about 30 cm is measured with an ordinary wooden ruler, then the error may be up to 1 mm too high or too low.

For most test measurements only two connections are needed just like a voltmeter. The time scale will operate at intervals pre-set by the user. It is also possible to connect a ‘trigger’ wire so that, for example, the time scale starts moving across the screen each time the ignition coil fires. This keeps the display in time with the speed of the engine. 1. A hand-held scope has to be connected for each waveform as required. All the waveforms shown in various parts of this book are from a correctly operating vehicle.

9 Flight recorder tests It is said that the best place to sit in an aeroplane is on the black box flight recorder! Well, apart from the black box usually being painted bright orange so it can be found after a crash, my reason for mentioning it is to illustrate how the flight recorder principle can be applied to automotive diagnostics. Most hand-held scopes now have flight record facilities. This means that they will save the signal from any probe connection in memory for later play back. The time duration will vary depending on the available memory and the sample speed but this is a very useful feature.

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