Recording Ammeters in .NET

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Recording Ammeters
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A clamp-on ammeter shows instantaneous current, at a moment in time But often when troubleshooting electrical equipment and systems, it is more useful to have a record of current over a period of time Figure 1-2 shows a recording ammeter used for this
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1-2 Recording ammeter
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purpose It has a current-sensing element similar to clamp-on ammeters, but produces a chart or graph showing current changes over time
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Voltmeters
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The unit of electromotive force (EMF) is the volt (V) One volt is the pressure that, if applied to an electrical circuit having a resistance of 1 , produces a current of 1 A Connect a voltmeter across the terminals at the place where the voltage is to be measured, as shown in Figure 1-3 Never connect a voltmeter across a circuit with a voltage higher than the rating of the instrument Doing so can damage the meter, or in extreme cases cause the voltmeter to explode
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DC Circuits
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When measuring voltage in a DC circuit, always observe proper polarity The negative lead of the voltmeter must be connected to the negative terminal of the DC source, and the positive lead to the positive
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1-3 Connecting a voltmeter to a circuit
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terminal If the leads are connected to opposite terminals, the needle will move in the reverse direction AC Circuits Since voltage constantly reverses polarity in an AC circuit, there is no need to observe polarity when measuring voltage on ac circuits (Figure 1-4) Voltage Ranges Many analog voltmeters have two or more voltage ranges that can be read on a common scale, such as 0 to 150 V, 0 to 300 V, and 0 to 600 V (Figure 1-5) When using a multirange voltmeter, always select a higher range than needed to assure that the meter won t be damaged Then, if the initial reading indicates that a lower scale is needed to obtain a more accurate reading, switch the voltmeter to the next lowest range
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1-4 Checking voltage at a 125-VAC duplex receptacle
1-5 Multirange, one-scale voltmeter
One reason that analog voltmeters have multiple ranges is that readings are more accurate on the upper half of the scale Thus, if they only had a single 0- to 600-V range, lower voltages would be harder to read accurately
Voltmeter Applications
Voltmeters are used for troubleshooting circuits, circuit tracing, and measuring low resistance For example, a common cause of electrical problems is low voltage at the supply terminals of equipment; this usually occurs for one or more of the following reasons:
Undersized conductors Overloaded circuits Transformer taps set too low 8
Low-Voltage Test
When making a low-voltage test, first take a reading at the service entrance For example, if the main service is rated 120/240, single-phase, three-wire, the voltage reading between phases (ungrounded conductors) should be 230 to 240 V If the reading is much lower than 230 V, the electric utility company should be contacted to correct the problem However, if the reading at the main service is between 230 and 240 V, the next procedure is to check the voltage reading at various outlets throughout the system When low-voltage problem is measured on a circuit, leave the voltmeter terminals connected across the line and begin disconnecting all the loads connected to that circuit, one at a time If the problem disappears after several of the loads have been disconnected, the circuit is probably overloaded (thus causing excessive voltage drop) Steps should be taken to reduce the load on that circuit or else increase conductor wire size to accommodate the load
Ground Fault
Ground faults are another common problem Assume that a small industrial plant has a three-phase, threewire, 240-V, delta-connected service The service equipment is installed, as shown in Figure 1-6 Under proper operating conditions, the voltmeter should read 240 V between phases (A-B, B-C, and A-C), and approximately 150 V between each phase to ground However, if checking with voltmeter indicates that two phases have a voltage of 230 V to ground and the 9
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