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Author Topic: Noise in CRO  (Read 1448 times)

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Offline Vindhyachal.taknikiTopic starter

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Noise in CRO
« on: January 29, 2015, 11:57:54 am »
I am using CRO to measure area under grap plotted by DAC output from MCU.
Problem is when I put probe on MCU output pin, there is random noise in signal i.e signal is not smooth.
That why I cannot read exact area under curve from MCU.

Earlier I thought noise could be from MCU pin. But I put the probe on GND pin of MCU, same random noise appears on it also.
CRO ground pin is connected to ground pin of MCU.
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Offline Andy Watson

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Re: Noise in CRO
« Reply #1 on: January 29, 2015, 04:05:49 pm »
The noise is probably being picked-up in the ground lead of your probe. Basically, wires have inductance, even short wires have significant inductance at higher frequencies! The video linked in this thread explains the problem:

https://www.eevblog.com/forum/index.php?topic=12540.0
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Offline katzohki

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Re: Noise in CRO
« Reply #2 on: January 29, 2015, 05:16:49 pm »
What is your ground of the CRO connected to?
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Offline Vindhyachal.taknikiTopic starter

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Re: Noise in CRO
« Reply #3 on: January 30, 2015, 05:05:18 am »
@andy,
thanks it helped
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