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You remember that the current through a circuit depends on the resistance. This principle can be used to manufacture a voltmeter using an ammeter and a resistor. The larger the value of the resistance in series with the meter, the more voltage is needed to produce a reading of full scale. This has a converse, or a flip side : Given a constant voltage, the current through the meter will vary if the resistance varies. This provides a means for measuring resistances. An ohmmeter is almost always constructed by means of a milliammeter or microammeter in series with a set of fixed, switchable resistances and a battery that provides a known, constant voltage (Fig. 3-8). By selecting the resistances appropriately, the meter will give indications in ohms over any desired range. Usually, zero on the meter is assigned the value of infinity ohms, meaning a perfect insulator. The full-scale value is set at a certain minimum, such as 1 , 100 , or 10 K (10,000 ). Ohmmeters must be precalibrated at the factory where they are made. A slight error in the values of the series resistors can cause gigantic errors in measured resistance. Therefore, precise tolerances are needed for these resistors. It is also necessary that the battery be exactly the right kind, and that it be reasonably fresh so that it will provide

the appropriate voltage. The smallest deviation from the required voltage can cause a big error in the meter indication. The scale of an ohmmeter is nonlinear. That is, the graduations are not the same everywhere. Values tend to be squashed together towards the infinity end of the scale.

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A mark is represented by a 1 or minus ( ) and a space is represented by a 0 or plus ( ) The use of opposite start and stop bits is the key to asynchronous communication The receiver must identify each incoming bit by its precise time of arrival It bases its reckoning of time on the exact instant of the signal s transition from the stop to start bit state This allows it to reset its timing with each new arrival of data, so that small timing errors can t accumulate over many frames to become big timing errors..

Multimeters 53 It can be difficult to interpolate for high values of resistance, unless the right scale is selected. Engineers and technicians usually connect an ohmmeter in a circuit with the meter set for the highest resistance range first; then they switch the range until the meter is in a part of the scale that is easy to read. Finally, the reading is taken, and is multiplied (or divided) by the appropriate amount as indicated on the range switch. Figure 3-9 shows an ohmmeter reading. The meter itself says 4.7, but the range switch says 1 K . This indicates a resistance of 4.7 K , or 4700 .

Figure 25-4 illustrates a preprogrammed keyboard chip from ham radio operator K1EL. (Type K1EL in you web browser.) This chip will allow you to use a standard IBM PS/2 keyboard to input controls to the STAMP 2 controller in order to locally control the Xlink system, if you do not wish to use the remote Internet feature. The 8-pin encoder chip is powered by 5 V. The keyboard is connected to ground and a 5-V source, as is the

Ohmmeters will give inaccurate readings if there is a voltage between the points where the meter is connected. This is because such a voltage either adds to, or subtracts from, the ohmmeter battery voltage. This in effect changes the battery voltage, and the meter reading is thrown way off. Sometimes the meter might even read more than infinity ohms; the needle will hit the pin at the left end of the scale. Therefore, when using an ohmmeter to measure resistance, you need to be sure that there is no voltage between the points under test. The best way to do this is to switch off the equipment in question.

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