Question

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Introduction to Multimeters:

Multimeters have the purpose and ability to measure a plethora of electrical quantities. In this lab specifically DC Voltage, AC RMS (Root-Mean-Squared) voltage, DC current, and resistance will be measured using a multimeter. When taking RMS readings, a great deal of care must be taken because of the fact that different multimeters perform at different levels and produce differently temporal averages. The way a good deal of multimeters measure the RMS voltage is measure the peak to peak voltage and then make an educated guess on what the RMS actually is. If for example the signal inputted is sinusoidal at one frequency, the RMS voltage can be calculated by said measurement. It is also interesting to note that the RMS measurements of current can be treated in the same way. It is clear to see that only when input signals reflect these assumptions that this type of multimeter can indeed be used. In the case of other multimeters, they measure what is known as “True RMS” voltage. This is measured by detecting how much heat a resistor dissipates over time in which a voltage is applied. These meters specifically are used to measure any signal’s RMS voltage including multi-frequency signals. In addition to this method, the RMS value can be found by sampling a particular signal and applying an equation that defines the RMS voltage for a discreet signal:

Making a voltage measurement with a multimeter:

         In order to measure the voltage across a certain electrical component (resistor, etc) it must be connected in parallel with the multimeter. In order for an accurate reading to take place, the impedance that is inputted must be several magnitudes larger than that of the resistor where the measurement is made.

Making current measurements with a multimeter:

         For current measurements, the multimeter must be placed in series instead of parallel with the circuit.

Answer 1

The given paragraph explains the usage of a multimeter. A Multimeter is a device that can measure much quantity such as AC and DC voltage, Currents, frequency, continuity, etc.

When an AC voltage is measured by a multimeter the value shown by multimeter is RMS value. Voltage measurement must be done in parallel with the component whose voltage is to be measured.

When the current measurement is done by the Multimeter, it should be connected in series to the component whose current is to be measured.

Voltage and current measurement is shown in the circuit diagram below

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