Using oscilloscope - Page 1
Forum section: electronics / beginners

author: selim
author_rank: Newbie
timestamp: November 03, 2022, 08:59:07 pm
content: In addition to question, what would we see on the monitor?

author: Bud
author_rank: Super Contributor
timestamp: November 03, 2022, 09:03:05 pm
content: Did you forget to write " Kindly give me an answer ASAP, my homework is due tomorrow morning" ?

author: bborisov567
author_rank: Regular Contributor
timestamp: November 03, 2022, 09:10:37 pm
content: The output depends on the frequency of the signal generator.

author: DC1MC
author_rank: Super Contributor
timestamp: November 03, 2022, 09:16:15 pm
content: Quote from: bborisov567 on November 03, 2022, 09:10:37 pmA smart student will not give a number as an answer, but a formula to calculate the value depending of the frequency, a very smart student will add the probe impedance in the equation and a young genius will use Wolfram Alpha

author: wasedadoc
author_rank: Super Contributor
timestamp: November 03, 2022, 09:16:27 pm
content: I think the question is attempting to discover if the student has a goodgroundingin using an oscilloscope.

author: bdunham7
author_rank: Super Contributor
timestamp: November 03, 2022, 09:20:00 pm
content: The implication of the test question is that it won't work properly. If youassumethat the triangle under the 10V source and the black clip of the oscilloscope are common grounds, then the capacitor will be shorted and you'll have the full 10V, in phase, across R1. And that's what you see on the scope, more or less, againassumingthat you have a high-impedance input on the scope and perhaps a 10X probe. But IMO, none of those assumptions is really justified without explicitly stating them.For a high-impedance scope/probe and no common ground, you see an amplitude less than 10V and out of phase (leading) the source voltage, varying with frequency. But you can't answer that question precisely without knowing the frequency of the AC source, so that's your clue that any such answer is not what the question is looking for.

author: golden_labels
author_rank: Super Contributor
timestamp: November 03, 2022, 09:33:13 pm
content: Noise. There is a 1px gap between the grounding clip and the circuit.

author: Gyro
author_rank: Super Contributor
timestamp: November 03, 2022, 09:44:48 pm
content: Quote from: Bud on November 03, 2022, 09:03:05 pmI'm still waiting for the day when we get exactly the same question from half a dozen people on same evening.

author: magic
author_rank: Super Contributor
timestamp: November 03, 2022, 09:58:05 pm
content: Quote from: bborisov567 on November 03, 2022, 09:10:37 pmIt will not.Watch "How to blow up your oscilloscope" by David L. Jones.editI mean, the amplitude doesn'tOther aspects may still vary

author: EEVblog
author_rank: Unknown
timestamp: November 03, 2022, 11:03:03 pm
content: Quote from: DC1MC on November 03, 2022, 09:16:15 pmAnd a practical engineering student will watch my video:BUT the schematic does not show a earth symbol, only a circuit ground symbol, so it could be floating.

author: EEVblog
author_rank: Unknown
timestamp: November 03, 2022, 11:03:53 pm
content: Quote from: selim on November 03, 2022, 08:59:07 pmAs per the rules for this section, please show what work you have done already to try and solve the problem.

author: EPAIII
author_rank: Super Contributor
timestamp: November 04, 2022, 07:26:06 am
content: This reminds me of those math problems that are always showing up on YouTube. They write a math expression but do not explain which, of several, rules of interpreting the manner of writing that expression. So, no matter what answer you give, someone will say you are wrong.I hate those math problems and I could grow to hate electronic questions like this.I say, if you want to know what you will see, connect the scope to the circuit and you will be enlightened. And if someone disagrees with your observation, please be kind.