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1414 A typical PC has 32 Mbytes of standard memory
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a How many words is this b How many nibbles is this c How many bits is this
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J Input CLK K
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1417 What is the distinction between volatile and
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nonvolatile memory
Figure P1411
1418 Suppose a particular magnetic tape can be
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1412 With reference to the JK ip- op of
Problem 1411, assume that the output at the Q terminal is made to serve as the input to a second JK ip- op wired exactly as the rst Sketch the Q output of the second ip- op 1413 Assume that there is a ip- op with the characteristic given in Figure P1413, where A and B are the inputs to the ip- op and Q is the next state output Using necessary logic gates, make a T ip- op from this ip- op
1419 Draw a block diagram of a circuit that will
interface two interrupts, INT0 and INT1, to the INT input of a CPU so that INT1 has the higher priority and INT0 has the lower In other words, a signal on INT1 is to be able to interrupt the CPU even when the CPU is currently handling an interrupt generated by INT0, but not vice versa
A CLK B
A 0 0 1 1
B 0 1 0 1
Q q q q 0
Figure P1413
Electronic Instrumentation and Measurements
his chapter introduces measurement and instrumentation systems and summarizes important concepts by building on the foundation provided in earlier chapters The development of the chapter follows a logical thread, starting from the physical sensors and proceeding through wiring and grounding to signal conditioning and analog-to-digital conversion, and nally to digital data transmission The rst section presents an overview of sensors commonly used in engineering measurements Some sensing devices have already been covered in earlier chapters, and others will be discussed in later chapters; the main emphasis in this chapter will be on classifying physical sensors, and on providing additional detail on some sensors not presented elsewhere in this book most notably, temperature transducers The second section of the chapter describes the common signal connections and proper wiring and grounding techniques, with emphasis on noise sources and techniques for reducing undesired interference Section 153 provides an essential introduction to digital signal conditioning, namely, a discussion of instrumentation ampli ers and active lters The last three sections introduce analog-to-digital conversion, other integrated circuits used in instrumentation systems, and digital data transmission, respectively
15
Electronic Instrumentation and Measurements
Upon completing this chapter, you should be able to:
Recognize the principal classes of sensors Design proper circuit connections to minimize noise in oating, grounded, and differential-source circuits Understand the concepts of shielding and grounding Specify, analyze, and design instrumentation ampli ers and simple active lters Understand the processes of analog-to-digital and digital-to-analog conversion, and specify the requirements of a data acquisition system Design simple instrumentation circuits using op-amps and integrated circuits Understand the basic principles of digital data transmission
MEASUREMENT SYSTEMS AND TRANSDUCERS
Measurement Systems In virtually every engineering application there is a need for measuring some physical quantities, such as forces, stresses, temperatures, pressures, ows, or displacements These measurements are performed by physical devices called sensors or transducers, which are capable of converting a physical quantity to a more readily manipulated electrical quantity Most sensors, therefore, convert the change of a physical quantity (eg, humidity, temperature) to a corresponding (usually proportional) change in an electrical quantity (eg, voltage or current) Often, the direct output of the sensor requires additional manipulation before the electrical output is available in a useful form For example, the change in resistance resulting from a change in the surface stresses of a material the quantity measured by the resistance strain gauges described in 21 must rst be converted to a change in voltage through a suitable circuit (the Wheatstone bridge) and then ampli ed from the millivolt to the volt level The manipulations needed to produce the desired end result are referred to as signal conditioning The wiring of the sensor to the signal conditioning circuitry requires signi cant attention to grounding and shielding procedures, to ensure that the resulting signal is as free from noise and interference as possible Very often, the conditioned sensor signal is then converted to digital form and recorded in a computer for additional manipulation, or is displayed in some form The apparatus used in manipulating a sensor output to produce a result that can be suitably displayed or stored is called a measurement system Figure 151 depicts a typical computer-based measurement system in block diagram form Sensor Classi cation There is no standard and universally accepted classi cation of sensors Depending on one s viewpoint, sensors may be grouped according to their physical characteristics (eg, electronic sensors, resistive sensors), or by the physical variable or
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