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Subelement 3
Measurements
Section 3-06
meters, multimeter, power meter
A meter has a full-scale deflection of 40 microamps and an internal resistance of 96 ohms. You want it to read 0 to 1 mA. The value of the shunt to be used is:
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24 ohms
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16 ohms
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Correct Answer4 ohms
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40 ohms
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A moving-coil milliammeter having a full-scale deflection of 1 mA and an internal resistance of 0.5 ohms is to be converted to a voltmeter of 20 volts fullscale deflection. It would be necessary to insert a:
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series resistance of 1 999.5 ohms
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Correct Answerseries resistance of 19 999.5 ohms
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shunt resistance of 19 999.5 ohms
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shunt resistance of 19.5 ohms
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A voltmeter having a range of 150 volts and an internal resistance of 150 000 ohms is to be extended to read 750 volts. The required multiplier resistor would have a value of:
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1 500 ohms
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750 000 ohms
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1 200 000 ohms
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Correct Answer600 000 ohms
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The sensitivity of an ammeter is an expression of:
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Correct Answerthe amount of current causing full-scale deflection
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the resistance of the meter
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the loading effect the meter will have on a circuit
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the value of the shunt resistor
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Voltmeter sensitivity is usually expressed in ohms per volt. This means that a voltmeter with a sensitivity of 20 kilohms per volt would be a:
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Correct Answer50 microampere meter
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1 milliampere meter
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50 milliampere meter
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100 milliampere meter
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The sensitivity of a voltmeter, whose resistance is 150 000 ohms on the 150-volt range, is:
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100 000 ohms per volt
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Correct Answer1000 ohms per volt
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10 000 ohms per volt
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150 ohms per volt
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The range of a DC ammeter can easily be extended by:
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connecting an external resistance in series with the internal resistance
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changing the internal inductance of the meter
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Correct Answerconnecting an external resistance in parallel with the internal resistance
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changing the internal capacitance of the meter to resonance
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What happens inside a multimeter when you switch it from a lower to a higher voltage range?
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Resistance is reduced in series with the meter
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Correct AnswerResistance is added in series with the meter
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Resistance is reduced in parallel with the meter
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Resistance is added in parallel with the meter
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How can the range of an ammeter be increased?
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Correct AnswerBy adding resistance in parallel with the meter
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By adding resistance in series with the circuit under test
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By adding resistance in parallel with the circuit under test
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By adding resistance in series with the meter
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Where should an RF wattmeter be connected for the most accurate readings of transmitter output power?
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One-half wavelength from the transmitter output
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Correct AnswerAt the transmitter output connector
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One-half wavelength from the antenna feed point
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At the antenna feed point
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At what line impedance do most RF wattmeters usually operate?
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25 ohms
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100 ohms
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300 ohms
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Correct Answer50 ohms
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