[SI-LIST] Re: Measuring Power supply noise
- From: dotter <dotter@xxxxxxxxxxxxx>
- Date: Mon, 20 Mar 2006 13:03:26 +0000
Slightly off-topic...
Is 0.5W a reasonable power to expect to dissipate in a scope front end?
BalaKrishnan, Kesavaperumal (IE10) wrote:
>Hi,
>
>
>To measure the noise of the power plane (We use LDO to generate 5V),
>
>
>
>I did the following
>
>a) I built a cable using a 50Ù Coax cable and used the internal termination of
>the oscilloscope.
>
>b) Removed a CAP from the board, used these PADS to solder my probe.
>
>
>
>The noise measured was around 20mV
>
>
>
>To check the sanity of my measurement, Instead of my 50Ù probe, I used a
>standard 1MÙ probe and carried out the measurement.
>
>The measured noise was around 50mV
>
>
>
>I have the following question.
>
>
>
>a) By using a 50Ù probe, did I create a voltage divider?
>
>
>
>Thanks in advance for your time.
>
>
>
>Regards,
>
>Bala
>
>
>
>
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