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[SI-LIST] Re: Low Load Probe Suggestions
- From: Doug Smith <doug@xxxxxxxxxx>
- To: Mark.Randol@xxxxxxxxxx
- Date: Wed, 12 Sep 2007 22:08:31 -0700
Hi Mark,
Just make sure you ask the rep if the probe you are looking at has
damping resistors at the tip. There may be another way to handle this
I am unaware of. If that is the case, the sales rep should be able to
prove his case. Or just put the probe with reasonable tips on a
network analyzer (I did just that and the result agreed with my
simulations and was surprising).
Doug
Mark Randol wrote:
> I know about the Agilent and Tek probes, and yes to update to the latest
> and greatest I need to do a little homework. However...
>
> Mostly I'm wondering if any of you have run across other vendors out
> there making interesting probe products.
>
> --
> 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)
> =20
> =20
>
>
>>-----Original Message-----
>>From: olaney@xxxxxxxx [mailto:olaney@xxxxxxxx]=20
>>Sent: Wednesday, September 12, 2007 1:08 PM
>>To: Mark Randol
>>Cc: si-list@xxxxxxxxxxxxx
>>Subject: Re: [SI-LIST] Low Load Probe Suggestions
>>=20
>>For input capacitance that low, you need a FET probe like the=20
>>Tek P6245.=20
>>Do your homework at the Tek and Agilent websites and I'm sure=20
>>you'll find what you want.
>>=20
>>Orin
>>=20
>>On Wed, 12 Sep 2007 10:09:33 -0700 "Mark Randol"=20
>><Mark.Randol@xxxxxxxxxx>
>>writes:
>>
>>>I realize this is like asking gear heads what motor oil=20
>>
>>they prefer,=20
>>
>>>but for low loading what probes do you prefer? I know what=20
>>
>>I've used,=20
>>
>>>but just wondering what else might be available.
>>>=20
>>>I'd prefer <1pF capacitance and at least 100kohm resistance. =20
>>>Bandwidth
>>>up to at least 500MHz, preferably into GHz. Low frequency=20
>>
>>should push=20
>>
>>>towards 10kHz. Tip voltages typically <5V, almost always <15V.
>>>Some
>>>wiggle room is allowed in the 'specs'.
>>>=20
>>>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
>>>=20
>>>
>>>>-----Original Message-----
>>>>From: si-list-bounce@xxxxxxxxxxxxx=3D20 =20
>>>>[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 =20
>
>>>>For years the electronic fluorescent light over the table I=3D20 =
>
> do=20
>
>>>>many of my experiments has been putting "fuzz" in some=3D20 scope=20
>>>>measurements. So, I decided to measure what was going=3D20 on. =
>
> This=20
>
>>>>month's Technical Tidbit on my site is:
>>>>=3D20
>>>>Abstract: Electronic fluorescent lights are capable of=3D20 =20
>>>>generating significant EMI. The nature of the EMI=20
>>
>>resulting=3D20 from=20
>>
>>>>internal switching used by such a light is presented.=3D20 The=20
>>>>amplitudes measured are significant and could affect high=3D20 =20
>>>>impedance analog circuits.
>>>>=3D20
>>>>The results are surprising in the amplitude observed at=20
>>
>>48=3D20 kHz.=20
>>
>>>>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=20
>
>>>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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>
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>
--
-------------------------------------------------------
___ _ Doug Smith
\ / ) P.O. Box 1457
========= 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
-------------------------------------------------------
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
http://www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
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