In this video, you will learn how to use measurement functions, create measurement expressions, and compare one waveform with another in PSpice. Let's use a band pass filter as our example circuit.

First, from the simulation, to access a list of measurement functions in PSpice, go to the Measurements option under Trace in the toolbar. Let's plot the 3 db bandwidth graph for our circuit. Click on Eval and select Output Load Voltage Trace from the list.

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You can also add measurement expressions in PSpice easily by going to the Evaluate Measurement option under Trace. For example, select the cutoff low pass 3 db function and enter VLoad / Vvn to measure the cutoff low pass value of the circuit. You can view the measurement's value within the Measurement Results tab.

To add a new measurement, simply click here. Let's add another expression for maximum value of output load voltage. The value of this measurement is displayed, here in addition to the previous value

PSpice also allows you to compare one waveform with the other easily. Let's compare the output voltage in two different cases for this circuit. Save this waveform for case 1 as original.dat. For the second case, change the load resistance value from 50 to 10 ohms and rerun the simulation. To compare waveforms of case 1 and 2, go to the Append Waveform option under File, and select the original.dat file that you saved earlier. You can also view the measurement values for both these cases here.

You have successfully learned to create measurement expressions, use measurement functions, and append two waveforms in PSpice.

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