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Measuring resistance is done with an inexpensive multimeter, like the one shown in 5. That same meter does a ne job of measuring DC voltage and AC RMS voltage. What it won t do is give a picture of the voltage levels over time. A far more expensive tool does this, the oscilloscope (Fig. 10-4). Where calculated diagrams like Figs. 10-2 and 10-3 can show us the math and the theory of the circuit, oscilloscopes show us a representation of what is actually happening. They are invaluable tools for the electronics workbench, with their only downside being their price. A basic oscilloscope like the one pictured in Fig. 10-4 costs $400 or so, with the better models starting at $1,000 and the best models costing as much as a small car.



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Clean room (a)

Fig. 10-4.

Service area Office and support area Clean room (b)

Minienvironment Service area Office and support area Clean room (c)





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The diode manipulates a circuit s voltage. While there are a number of nuances to the diode s behavior, it has two primary e ects on circuits. First is its unusual ability to conduct electricity in only one direction. Of course, if you apply too much voltage to a diode it will, like most components, break down and stop working correctly. Note the arrow in the diode s schematic gure in Fig. 10-5. This is the direction of the forward current (illustrated in terms of conventional current), owing from the anode (A) to the cathode (C). The cathode line on the diode itself matches the line on the schematic. You can say that the diode s arrow points toward ground, or the circuit s negative terminal. For example, in the circuit in Fig. 10-6, the diode allows electricity to conduct through the resistive load. The second attribute of the diode is its forward voltage drop. The voltage leaving a diode is always less than the voltage entering the diode. It is important to point out that, in spite of this, a diode doesn t have a signi cant resistance. This voltage drop is typically less than a volt, often about a halfvolt drop. In some cases this is just an annoying side e ect. However, you can also design circuits to speci cally use this voltage drop.

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(c) minienvironment type [20]

isolation of low frequency vibrations should be achieved by a judicious selection of the site for the location of the building and the design of the foundation and its isolation Suspended dust particles and oil in the air may lead to deposits on workpieces, surface plates and pickups This will lead to errors in measurements and will also cause problems in the manufacture of optical quality components Dust particles can also affect the performance of sensitive slideways and air bearings Furthermore, the velocity of air in the measuring area should be low enough so as not to disturb the sensitive instrumentation; it should however provide a feeling of comfort to the working personnel The intensity of lighting should be conducive for reading and working without causing any

Fig. 10-5.

Microelectro-mechanical Systems (MEMS)

There are many other subtle attributes of diodes, such as how quickly they can respond to changing voltages, how much they leak when reverse current is applied, their breakdown voltage beyond which they burn out, and others.

eye strain However, consideration is also to be given to the fact that lighting contributes to the heating load from the point of view of maintainability of stringent temperature tolerances In addition, the noise level of the laboratories is to be maintained within the acceptable level Due to practical considerations, usually different noise levels are specified for metrology laboratories and machine shops A number of studies are being conducted on the airflow characteristics of a clean room It is found that the airflow characteristics of clean rooms are largely affected by the porosity of the access panel and adjustment of dampers, and the cross-contamination varies with the location of the source and the passage of time through the concentration ratio [22] Yang and Fu [23] have indicated that recirculation zones are formed around the operator and workbench due to the movement of the operator The recirculation zones are not favourable to the clean room because they may induce a local turbulent flow and entrain and trap contaminants [23] An example of the specifications of the various parameters under control at the Precision Engineering Centre laboratories at CMTI, Bangalore, is given in Table 85 There are several problems commonly associated with the wrong designing of clean rooms These problems include insufficient air flow, inadequate laminarity, failure to attain a specified pressure level, local stagnation near points of service, big stagnation zones, ineffective chemical vapour exhaust, too high a noise, temperature and humidity variations above specified levels [8]

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