# how to compute voltage gain using multisim simulation?

Discussion in 'Homework Help' started by Nour Zeddouri, Mar 22, 2016.

1. ### Nour Zeddouri Thread Starter New Member

Feb 8, 2016
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hello , plz my Q is how to measure the voltage gain using the oscilloscope in multisim simulation??
the circuit is about biasing single transistor amplifier

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2. ### WBahn Moderator

Mar 31, 2012
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First start with the definition for gain that is relevant to the question you are trying to answer.

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3. ### shteii01 AAC Fanatic!

Feb 19, 2010
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Here is how I did it in the laboratory assignments.

Look at the oscilloscope picture. Your oscilloscope has two channels, Channel A and Channel B. Channel A has two legs, + leg and - leg. Same for Channel B.

The input signal is 1 mV peak and its frequency is 1 kHz. Draw wire from +leg Channel A of oscilloscope to the + side of the voltage source that provides input signal. Draw wire from -leg Channel A of oscilloscope to the ground. Double click on the oscilloscope picture to open the oscilloscope display and oscilloscope controls. Adjust Channel A controls to show your signal, change the vertical scale to 5 mV or even 2 mV, change horizontal scale to $\frac{1}{1 kHz}=1 ms$. Now turn on the simulation and see if your input signal will show.

Last edited: Mar 22, 2016
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4. ### Nour Zeddouri Thread Starter New Member

Feb 8, 2016
12
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thank you for your answer , in fact my problem is about the output signal and the gain ??

5. ### shteii01 AAC Fanatic!

Feb 19, 2010
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Do the same to the output signal, do it on Channel A or Channel B. Pause the simulation. Then move the trace to measure the peak of the output signal. You know input is 1 mV peak. The trace will show the peak of the output. Output divided by input is your gain.

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6. ### Nour Zeddouri Thread Starter New Member

Feb 8, 2016
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Thank you very much