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11 Cards in this Set
- Front
- Back
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How does electrostatic deflection work?
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a pair of plates will attract or repel each other if they are charged
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How is an ohmmeter constructed?
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an ammeter in series with a set of fixed, switchable resistances and a battery to provide a known constant voltage
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Why must the battery in an ohmmeter be relatively fresh?
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A known battery voltage is used as part of the calculation to determine resistance
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Why must the circuit be off, when attempting to measure resistance?
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A known battery voltage is used as part of the calculation to determine resistance. External voltage will throw off the values.
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What is a "VOM" meter?
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Voltage, Ohm, Milliammeter. It is a type of multimeter.
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Commercially available multimeters have a maximum voltage capability of around _________. The maximum current they can measure is about ______. The maximum resistance is on the order of several _____________.
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1000 volts, 1A, megohms.
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What is a VTVM (meter)?
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Vacuum-tube voltmeter
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What is a FETVM (meter)?
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Field-effect transistor voltmeter
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To measure electrical power, what two other things must also be measured?
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Voltage and current both must be measured simultaneously.
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To measure power-supply voltage being used by a circuit, a voltmeter ...
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is placed in parallel with the circuit that works from the power supply (i.e. in parallel/across the component/circuit)
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What is the main advantage of an FETVM?
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draws less current from the circuit under test
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