Author Topic: Help me about using oscilloscope ?  (Read 1885 times)

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Offline Nhan95

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Help me about using oscilloscope ?
« on: May 11, 2015, 01:22:10 am »
When I use analog oscilloscope in the experiment, sometimes I work with sine wave or square wave, my teacher asked me to choose DC mode for channel 0 and channel 1 or I will face with wrong result. Uhm, I feel confused :( .  Could you help me when we use DC or AC mode?
 

Offline xrunner

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Re: Help me about using oscilloscope ?
« Reply #1 on: May 11, 2015, 01:27:19 am »
If the sine wave or square wave has a DC bias either pos. or Neg, then you need to be DC coupled or you won't be able to see the offset. AC coupling will remove any DC biasing of a waveform.
I want to try Prevagen memory support but I can't remember to buy it.
 

Offline Paul Moir

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Re: Help me about using oscilloscope ?
« Reply #2 on: May 11, 2015, 01:37:08 am »
Another way understanding it is to see what the switch actually does.  When I was younger, I could only afford old tube based 5MHz bandwidth oscilloscopes, which were pretty horrible but how they worked was obvious just by looking.  The AC coupling switch simply put a 0.1uF capacitor in series with your probe lead.  That way all DC was blocked to the vertical amplifier.
 

Offline Lightages

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Re: Help me about using oscilloscope ?
« Reply #3 on: May 11, 2015, 01:47:34 am »
Before asking for any help with basic use of an oscilloscope, everyone should watch the video in this thread.

https://www.eevblog.com/forum/beginners/oscilloscope-training-class-(long)/
 

Offline pascal_sweden

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Re: Help me about using oscilloscope ?
« Reply #4 on: May 11, 2015, 01:55:03 am »
Or you could download this document from Tektronix :)
http://info.tek.com/www-xyzs-of-oscilloscopes-primer.html
 

Offline xrunner

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Re: Help me about using oscilloscope ?
« Reply #5 on: May 11, 2015, 01:58:13 am »
...my teacher asked me to choose DC mode for channel 0 and channel 1 or I will face with wrong result.

I'm thinking - is the teacher teaching you these things? Did you ask the teacher? Just thinking out loud on this end.  ???
I want to try Prevagen memory support but I can't remember to buy it.
 


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