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Extra resources for Introduction to Circuit Protection, Control, and Measurement

Sample text

AMMETER RANGES If you have a meter movement with a sensitivity of 1 milliampere, you can connect it in series with a circuit and measure currents up to 1 milliampere. But what do you do to measure currents over 1 milliampere? To answer this question, look at figure 1-21. In figure 1-21(A), 10 volts are applied to two resistors in parallel. 11-ohm resistor. —Current in a parallel circuit. In figure 1-21(B), the voltage is increased to 100 volts. Now, 1-19 In figure 1-21(C), the voltage is reduced from 100 volts to 50 volts.

Q15. What are two methods used to damp a meter movement? Q16. What value does a meter movement react to (actually measure) when measuring ac? Q17. What value is indicated on the scale of an ac meter? An additional advantage of damping a meter movement is that the damping systems will act to slow down the coil and help keep the pointer from overshooting its rest position when the current through the meter is removed. INDICATING ALTERNATING CURRENT Another problem encountered in measuring ac is that the meter movement reacts to the average value of the ac.

A voltmeter and a range resistor. In figure 1-28(A), a voltmeter with a range of 10 volts and a resistance of 1 kilohm (R2) is connected in parallel to resistor R1. 01 ampere of current (full-scale deflection) and indicates 10 volts. In figure 1-28(B), the voltage has been increased to 100 volts. This is more than the meter can measure. A 9 kilohm resistor (R3) is connected in series with the meter (R2). 01 ampere of current (full-scale deflection). But since R3 has increased the voltage capability of the meter, the meter indicates 100 volts.

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