[SI-LIST] Measuring Power supply noise
- From: "BalaKrishnan, Kesavaperumal (IE10)" <BalaKrishnan.Kesavaperumal@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 20 Mar 2006 18:23:13 +0530
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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