Re: Oscope measurement and probe grounding
- From: "Ralph Mowery" <rmowery28146@xxxxxxxxxxxxx>
- Date: Sun, 28 Aug 2005 22:40:29 GMT
"jw" <letron_2000no__spam@xxxxxxxxx> wrote in message
news:wMqQe.519$nB6.331@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi,
>
> I have just set up my ERA-1SM amplifier, like it says to do here (P. 2) :
> http://www.minicircuits.com/appnote/an60010.pdf
>
> You can clearly see the output point.
>
> My question involves my Oscope measurement technique.
>
> What am I measuring if I just connect the probe to the output point
without
> grounding it? That is, just attach the probe point to the output and do
not
> clip the probe ground to circuit ground. I am getting values, but I'm not
> sure what it represents?
>
> I am using a Pico 212 scope that is attached to my laptop using the RS-232
> port.
>
> Further I am using probe that is rated to 100MHz but I believe the
circuit
> is operating more toward 1 GHz - so do I need to get a "faster" probe to
> meaure this circuit? I don't need any very precise results, I just want to
> see if I have the amplifier set up correctly to work.
>
>
It is no real way of knowing what you are measuring without the ground
connected. Many times the scope will just pick up 60 hz powerline noise
(assuming you are in an area near powerlines and they are 60 hz.
Also you need to provide an input to the amp. Without that you should not
see much at the output.
.
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