[SI-LIST] Re: Low Load Probe Suggestions
- From: <art_porter@xxxxxxxxxxx>
- To: <jory_mckinley@xxxxxxxxx>, <Mark.Randol@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 12 Sep 2007 14:40:06 -0600
The fact is that you're generally limited to probes made by your scope's =
manufacturer, except for general-purpose, 1M ohm, <500 MHz passive =
divider probes. Which is an excellent reason to consider the =
manufacturer's range of probe offerings when considering a scope =
purchase. Another caution: It may often be that not all of a given =
manufacturer's probes will work with all of their scopes, and often for =
some very good, unavoidable reasons.=20
Art Porter =20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Jory McKinley
Sent: Wednesday, September 12, 2007 2:10 PM
To: Mark.Randol@xxxxxxxxxx; SI-List
Subject: [SI-LIST] Re: Low Load Probe Suggestions
Mark,
Depending on the scope and what you are attempting to capture. I tend =
to go with a probe that does not limit my scope. So for example, an =
8GHZ analog (25GS/s digital), a probe BW over 10GHz with similar loading =
as you mentioned.
-Jory
----- Original Message ----
From: Mark Randol <Mark.Randol@xxxxxxxxxx>
To: SI-List <si-list@xxxxxxxxxxxxx>
Sent: Wednesday, September 12, 2007 12:09:33 PM
Subject: [SI-LIST] Low Load Probe Suggestions
I realize this is like asking gear heads what motor oil they prefer, but
for low loading what probes do you prefer? I know what I've used, but
just wondering what else might be available.
I'd prefer <1pF capacitance and at least 100kohm resistance. Bandwidth
up to at least 500MHz, preferably into GHz. Low frequency should push
towards 10kHz. Tip voltages typically <5V, almost always <15V. Some
wiggle room is allowed in the 'specs'.
Regards,
--
Mark Randol, RF Evaluation & Application Engineer
ON Semiconductor
901 S. Mopac Expressway
Barton Oaks 4, Suite 343
Austin, TX 78746
512-329-5640 (voice), 512-329-8151 (FAX)
=3D20
=3D20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=3D20
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Doug Smith
> Sent: Wednesday, September 12, 2007 1:30 AM
> To: emc-pstc; SI-List
> Subject: [SI-LIST] Fluorescent light noise
>=3D20
> Hi Everyone,
>=3D20
> For years the electronic fluorescent light over the table I=3D20
> do many of my experiments has been putting "fuzz" in some=3D20
> scope measurements. So, I decided to measure what was going=3D20
> on. This month's Technical Tidbit on my site is:
>=3D20
> Abstract: Electronic fluorescent lights are capable of=3D20
> generating significant EMI. The nature of the EMI resulting=3D20
> from internal switching used by such a light is presented.=3D20
> The amplitudes measured are significant and could affect high=3D20
> impedance analog circuits.
>=3D20
> The results are surprising in the amplitude observed at 48=3D20
> kHz. Go to http://emcesd.com . The picture of the scope=3D20
> probe and fluorescent light is the link to the article.
>=3D20
> Doug
> --
> -------------------------------------------------------
> ___ _ Doug Smith
> \ / ) P.O. Box 1457
> =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D Los =
Gatos, CA 95031-1457
> _ / \ / \ _ TEL/FAX: 408-356-4186/358-3799
> / /\ \ ] / /\ \ Mobile: 408-858-4528
> | q-----( ) | o | Email: doug@xxxxxxxxxx
> \ _ / ] \ _ / Website: http://www.dsmith.org
> -------------------------------------------------------
>=3D20
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