Path: ...!weretis.net!feeder6.news.weretis.net!panix!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!feeder.usenetexpress.com!tr1.iad1.usenetexpress.com!69.80.99.22.MISMATCH!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Mon, 08 Apr 2024 01:38:18 +0000 From: John Larkin Newsgroups: sci.electronics.design Subject: Re: Scope Probes off Ebay Date: Sun, 07 Apr 2024 18:36:36 -0700 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: References: <4l851jte21egs8mmkqou4proepifknb7v7@4ax.com> <55j51j5n2p9chajruolqrmqs57smippb5t@4ax.com> X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 44 X-Trace: sv3-RboRxyhXgvCHiyuNckVetoz/08/cvNhtbbK7m1S25XQ19WcnJQbbxbOUSqYCYCiGxmuwSzl58pTyFeM!igTprrZzAfzu8fMAqpYW0R+KGpLzVDMYfmMWef+afNXiw2xW9bGzqMm37mY6qrNuPHt8MHlxkwKd!BXZ0Yg== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 3377 On Mon, 8 Apr 2024 11:06:52 +1000, Chris Jones wrote: >On 8/04/2024 2:57 am, John Larkin wrote: >> On Sun, 07 Apr 2024 14:51:29 +0100, Cursitor Doom >> wrote: >> >>> I never learn. I bought a used "Agilent 500Mhz probe" off Ebay for 50 >>> quid as the highest bandwidth probe I thought I had was a 150Mhz Tek >>> one. Anyway, I have a large selection of old probes lying around so >>> decided to check to make sure the "Agilent" one was genuine. Not >>> surprisingly it turns out it isn't. I haven't calculated what it's >>> real bandwidth is. I've established it's not as sensitive as the >>> 150Mhz one and that's all I need to know. Whilst I was going through >>> this palarva, I tested a old probe I came across that I've never used >>> before and was amazed at the improvement in signal I got with it. I've >>> just Googled its part number and it turns out it's a 3.5Ghz passive >>> probe! I never even knew I had one so fast. I would never have ordered >>> the "500Mhz" one if I'd known I had this forgotten-about one already. >>> So the fake's going back for a refund and I won't be ordering any >>> more probes from anywhere in the forseeable future. >> >> The HP54006 is a 6 GHz probe, into a 50 ohm scope. >> >> https://www.dropbox.com/s/lxq4ujmkvo755uy/HP54006_probe.zip?dl=0 >> >> They show up on ebay now and then. There's one now, asking $150. >> >> You can make your own with some of those Caddock resistors. The >> Caddocks have some magical recipe. And unlike a fet probe, they are >> hard to damage. I use them to probe 7 ns 1400 volt spikes in my >> Pockels Cell driver. >> >> And you can do a GHz at least with a 1-cent axial or mini-MELF or 0805 >> resistor on the end of a coax. 450 ohms makes a 10:1 probe. Fast >> circuits are often low impedance circuits and don't mind a 500r or 1K >> load. >> > > >Which Caddock part number? In the zip file.