How accurate is the DMM in making voltage measurements Does

How accurate is the DMM in making voltage measurements? Does the Multi-meter require any calibration? How do the RC circuit measurements obtained by LabVIEW differ with those obtained by MultiSim? Explain any perceived differences. Why must we generate and save separate input waveforms in MultiSim? Explain how the input and output differs in an RC circuit. If we define the phase delay as the angle difference between the output and input sinusoid waveforms, calculate the phase delay. If we define the gain as the amplitude of the output voltage sinusoid divided by the amplitude of the input voltage sinusoid, calculate the gain. Is the gain and phase delay a function of the input peak voltage? A function of the input frequency? How is the frequency of the output related to the frequency of the input?

Solution

A digital multimeter will only be able to meet its specifications when it is within a certain environment. Conditions such as temperature, humidity and the like will have impact on the performance. Also conditions such as line voltage can affect the performance. In order to ensure that the digital multimeter is able to operate within its uncertainty specification, it is necessary to ensure that the external conditions are met. Outside this range the errors will increase and the readings can no longer be guaranteed.

As all circuits will drift with time, the DMM will need to be periodically re-calibrated to ensure that it is operating within its specification. The calibration period will form part of the specification for the DMM. The most usual calibration period is a year, but some digital multimeter specifications may state a 90 day calibration period. The 90 day period will enable a tighter specification to be applied to the digital multimeter, allowing it to be used in more demanding applications.