[SI-LIST] Re: Measuring Power supply Ripple and Noise
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Hal Murray <hmurray@xxxxxxxxxxxxxxx>
- Date: Sat, 15 Nov 2008 04:23:48 -0800
Simplicity, yes.
Good for looking at real time noise, yes.
Good to have around, yes.
Good for looking at impedance with a VNA sometimes.
At milliohm / 100's of MHz land it's very easy to get enough coupling
from the gnd / probe tip loops of the two probes to see substantial
measurement error. This is the same problem that the Agilent probes
have as they have quite a large gnd / probe open area. The TEK P6150's
have a fairly small area, but even with that, copper tape is often needed.
Steve.
Hal Murray wrote:
>> Both TEK and Agilent offer 10:1 passive probes. I far prefer to use
>> these probes when possible rather than soldering up coax. ...
>>
>
> It took me a while to appreciate the simplicity of coax and solder.
>
> For $10, you can get a 6 ft chunk of coax with molded BNC connectors. Cut it
> in half and you have two coax probes. Remove a bypass cap and you have a
> good place to solder it to.
>
>
>
>
>
--
Steve Weir
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