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The importance of proper circuit connections cannot be overemphasized Unfortunately, this is a subject that is rarely taught in introductory electrical engineering courses The present section summarizes some important considerations regarding signal source connections, various types of input con gurations, noise sources and coupling mechanisms, and means of minimizing the in uence of noise on a measurement Signal Sources and Measurement System Con gurations Before proper connection and wiring techniques can be presented, we must examine the difference between grounded and oating signal sources Every sensor can be thought of as some kind of signal source; a general representation of the connection of a sensor to a measurement system is shown in Figure 157(a) The sensor is modeled as an ideal voltage source in series with a source resistance Although this representation does not necessarily apply to all sensors, it will be adequate for the purposes of the present section Figures 157(b) and (c) show two types of signal sources: grounded and oating A grounded signal source is one
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Figure 156 Four-wire RTD circuit (a) and three-wire Wheatstone bridge RTD circuit (b)
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(a) Ideal signal source connected to measurement system
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(b) Grounded signal source
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(c) Floating signal source
Figure 157 Measurement system and types of signal sources
in which a ground reference is established for example, by connecting the signal low lead to a case or housing A oating signal source is one in which neither signal lead is connected to ground; since ground potential is arbitrary, the signal source voltage levels (signal low and signal high) are at an unknown potential relative to the case ground Thus, the signal is said to be oating Whether a sensor can be characterized as a grounded or a oating signal source ultimately depends on the connection of the sensor to its case, but the choice of connection may depend on the nature of the source For example, the thermocouple described in Section 151 is intrinsically a oating signal source, since the signal of interest is a difference between two voltages The same thermocouple could become a grounded signal source if one of its two leads were directly connected to ground, but this is usually not a desirable arrangement for this particular sensor In analogy with a signal source, a measurement system can be either groundreferenced or differential In a ground-referenced system, the signal low connection is tied to the instrument case ground; in a differential system, neither of the two signal connections is tied to ground Thus, a differential measurement system is well suited to measuring the difference between two signal levels (such as the output of an ungrounded thermocouple) One of the potential dangers in dealing with grounded signal sources is the introduction of ground loops A ground loop is an undesired current path caused by the connection of two reference voltages to each other This is illustrated in Figure 158, where a grounded signal source is shown connected to a groundreferenced measurement system Notice that we have purposely denoted the signal source ground and the measurement system ground by two distinct symbols, to emphasize that these are not necessarily at the same potential as also indicated by the voltage difference V Now, one might be tempted to tie the two grounds to each other, but this would only result in a current owing from one ground to the other, through the small (but nonzero) resistance of the wire connecting the two The net effect of this ground loop would be that the voltage measured by the instrument would include the unknown ground voltage difference V , as shown in Figure 158 Since this latter voltage is unpredictable, you can see that ground loops can cause substantial errors in measuring systems In addition, ground loops are the primary cause of conducted noise, as explained later in this section
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