For input capacitance that low, you need a FET probe like the Tek P6245. Do your homework at the Tek and Agilent websites and I'm sure you'll find what you want. Orin On Wed, 12 Sep 2007 10:09:33 -0700 "Mark Randol" <Mark.Randol@xxxxxxxxxx> writes: > 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) > =20 > =20 > > > -----Original Message----- > > From: si-list-bounce@xxxxxxxxxxxxx=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 > >=20 > > Hi Everyone, > >=20 > > For years the electronic fluorescent light over the table I=20 > > do many of my experiments has been putting "fuzz" in some=20 > > scope measurements. So, I decided to measure what was going=20 > > on. This month's Technical Tidbit on my site is: > >=20 > > Abstract: Electronic fluorescent lights are capable of=20 > > generating significant EMI. The nature of the EMI resulting=20 > > from internal switching used by such a light is presented.=20 > > The amplitudes measured are significant and could affect high=20 > > impedance analog circuits. > >=20 > > The results are surprising in the amplitude observed at 48=20 > > kHz. Go to http://emcesd.com . The picture of the scope=20 > > probe and fluorescent light is the link to the article. > >=20 > > Doug > > -- > > ------------------------------------------------------- > > ___ _ Doug Smith > > \ / ) P.O. Box 1457 > > =3D=3D=3D=3D=3D=3D=3D=3D=3D 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 > > ------------------------------------------------------- > >=20 > > ------------------------------------------------------------------ > > To unsubscribe from si-list: > > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject > field > >=20 > > or to administer your membership from a web page, go to: > > //www.freelists.org/webpage/si-list > >=20 > > For help: > > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > >=20 > >=20 > > List technical documents are available at: > > http://www.si-list.net > >=20 > > List archives are viewable at: =20 > > //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 > > =20 > >=20 > >=20 > ------------------------------------------------------------------ > 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: > //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: > //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 > > > > ------------------------------------------------------------------ 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: //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: //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