> I just looked at your mentioned Textronix probe Phillip. U shouldn't use such a probe if you want low interference because it has a very high RC load in the R component. Maybe U should use a classic 10M Ohm probe instead and connect that to a 1 MOhm scope? My impression is that your probe is designed for 50 Ohm RF circuitry and that the 1KOhm-probe is supposed to be a calculated load in that circuitry. /Roger
> @lists.sourceforge.net > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.sourceforge.net/lists/listinfo/emc-users > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Emc-users digest..." > > > Today's Topics: > > 1. Re: bad links (andy pugh) > 2. PCB adapters for oscilloscope probes (Philipp Burch) > 3. Re: PCB adapters for oscilloscope probes (Karlsson & Wang) > 4. Re: PCB adapters for oscilloscope probes (Philipp Burch) > 5. Re: PCB adapters for oscilloscope probes (andy pugh) > 6. Re: PCB adapters for oscilloscope probes (Bertho Stultiens) > 7. Re: PCB adapters for oscilloscope probes (Florian Rist) > 8. Re: PCB adapters for oscilloscope probes (Florian Rist) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 17 Mar 2015 20:36:25 +0000 > From: andy pugh <[email protected]> > Subject: Re: [Emc-users] bad links > To: "Enhanced Machine Controller (EMC)" > <[email protected]> > Message-ID: > <CAN1+YZV3a6PWFD0tUpPzGE==tdauef3tjkkihlyhvo_rdnr...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > >> On 17 March 2015 at 20:24, <[email protected]> wrote: >> On the page 'http://wiki.linuxcnc.org/cgi-bin/wiki.pl?RaspbianXenomaiBuild' >> at the bottom under '9. Pre-built image' the link >> 'http://87.106.51.120/downloads/xenomai.img' >> returns 404 and the link 'http://filecloud.io/_0vew6zmj' will not accept >> the given username and password. > > LinuxCNC does not support Xenomai. > > Like much else on the Wiki that page is obsolete and outdated. > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > > > ------------------------------ > > Message: 2 > Date: Tue, 17 Mar 2015 22:21:45 +0100 > From: Philipp Burch <[email protected]> > Subject: [Emc-users] PCB adapters for oscilloscope probes > To: "Enhanced Machine Controller (EMC)" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset="utf-8" > > Hi everyone, > > please excuse this question very unrelated to LinuxCNC, but I know that > here are quite some people around who are familiar with scopes and > high-frequency measurements. Some who like Tek and some who don't ;) > > Anyway, I've got a project where I need to measure signals with > frequencies in the range 10Mhz .. 100Mhz without loading the driver > itself too much (the goal is to figure out how a current control loop > behaves at these frequencies, so I should not add much more phase lag > just by attaching the probe). Tektronix probes of type P6158 > (http://www.tek.com/sites/tek.com/files/media/media/resources/60W_12026_2_0.pdf) > are available, so this is ok. What we haven't a large amount of, > however, are those PCB adapters (the ones with the four ground pins, > where you can stick the probe vertically into). Something like this: > http://hb9etc.ch/images/tek_probe_adapter_131-4244-00.png > > Now the question: Does anyone here have an idea how or where to get some > spares of those adapters? The part# 131-4244-00 does not seem to exist > anymore. In the probe datasheet, there is 131-5031-00 listed for those > adapters, but market results aren't much better for those. What I found > so far is a product on Amazon: > http://www.amazon.com/Tektronix-131-5031-00-Tip-Probe/dp/B00DJS7BMU > This could probably be the right thing, but $184 for 25 of those > thingies is also quite a number. Might be worth it, but still, if anyone > has a better idea/source/offer/whatever, please tell me. > > Thanks! > > Cheers, > Philipp > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: signature.asc > Type: application/pgp-signature > Size: 473 bytes > Desc: OpenPGP digital signature > > ------------------------------ > > Message: 3 > Date: Tue, 17 Mar 2015 23:09:10 +0100 > From: Karlsson & Wang <[email protected]> > Subject: Re: [Emc-users] PCB adapters for oscilloscope probes > To: "Enhanced Machine Controller \(EMC\)" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=US-ASCII > > It is possible to hold probe a little bit above the point, amplitude will > however not be accurate. Rugoski coil is also useful for high frequency > measurements of currents but not low frequency or DC. > > Nicklas Karlsson > > > > > On Tue, 17 Mar 2015 22:21:45 +0100 > Philipp Burch <[email protected]> wrote: > >> Hi everyone, >> >> please excuse this question very unrelated to LinuxCNC, but I know that >> here are quite some people around who are familiar with scopes and >> high-frequency measurements. Some who like Tek and some who don't ;) >> >> Anyway, I've got a project where I need to measure signals with >> frequencies in the range 10Mhz .. 100Mhz without loading the driver >> itself too much (the goal is to figure out how a current control loop >> behaves at these frequencies, so I should not add much more phase lag >> just by attaching the probe). Tektronix probes of type P6158 >> (http://www.tek.com/sites/tek.com/files/media/media/resources/60W_12026_2_0.pdf) >> are available, so this is ok. What we haven't a large amount of, >> however, are those PCB adapters (the ones with the four ground pins, >> where you can stick the probe vertically into). Something like this: >> http://hb9etc.ch/images/tek_probe_adapter_131-4244-00.png >> >> Now the question: Does anyone here have an idea how or where to get some >> spares of those adapters? The part# 131-4244-00 does not seem to exist >> anymore. In the probe datasheet, there is 131-5031-00 listed for those >> adapters, but market results aren't much better for those. What I found >> so far is a product on Amazon: >> http://www.amazon.com/Tektronix-131-5031-00-Tip-Probe/dp/B00DJS7BMU >> This could probably be the right thing, but $184 for 25 of those >> thingies is also quite a number. Might be worth it, but still, if anyone >> has a better idea/source/offer/whatever, please tell me. >> >> Thanks! >> >> Cheers, >> Philipp > > > > ------------------------------ > > Message: 4 > Date: Tue, 17 Mar 2015 23:16:43 +0100 > From: Philipp Burch <[email protected]> > Subject: Re: [Emc-users] PCB adapters for oscilloscope probes > To: [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset="windows-1252" > > Hi Nicklas! > >> On 17.03.2015 23:09, Karlsson & Wang wrote: >> It is possible to hold probe a little bit above the point, amplitude will >> however not be accurate. Rugoski coil is also useful for high frequency >> measurements of currents but not low frequency or DC. > > Unfortunately, amplitude is quite something that matters. According to > my simulations, the loading of the mentioned probe should be ok, it > really only the problem of securely attaching it for doing the > measurements. It is not a single-shot thing, I'll need to take hundreds > of waveforms without readjusting the probe, so manually holding it on or > somewhere near the testpoint is not really an option. > > Regards, > Philipp > >> >> On Tue, 17 Mar 2015 22:21:45 +0100 >> Philipp Burch <[email protected]> wrote: >> >>> Hi everyone, >>> >>> please excuse this question very unrelated to LinuxCNC, but I know that >>> here are quite some people around who are familiar with scopes and >>> high-frequency measurements. Some who like Tek and some who don't ;) >>> >>> Anyway, I've got a project where I need to measure signals with >>> frequencies in the range 10Mhz .. 100Mhz without loading the driver >>> itself too much (the goal is to figure out how a current control loop >>> behaves at these frequencies, so I should not add much more phase lag >>> just by attaching the probe). Tektronix probes of type P6158 >>> (http://www.tek.com/sites/tek.com/files/media/media/resources/60W_12026_2_0.pdf) >>> are available, so this is ok. What we haven't a large amount of, >>> however, are those PCB adapters (the ones with the four ground pins, >>> where you can stick the probe vertically into). Something like this: >>> http://hb9etc.ch/images/tek_probe_adapter_131-4244-00.png >>> >>> Now the question: Does anyone here have an idea how or where to get some >>> spares of those adapters? The part# 131-4244-00 does not seem to exist >>> anymore. In the probe datasheet, there is 131-5031-00 listed for those >>> adapters, but market results aren't much better for those. What I found >>> so far is a product on Amazon: >>> http://www.amazon.com/Tektronix-131-5031-00-Tip-Probe/dp/B00DJS7BMU >>> This could probably be the right thing, but $184 for 25 of those >>> thingies is also quite a number. Might be worth it, but still, if anyone >>> has a better idea/source/offer/whatever, please tell me. >>> >>> Thanks! >>> >>> Cheers, >>> Philipp > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: signature.asc > Type: application/pgp-signature > Size: 473 bytes > Desc: OpenPGP digital signature > > ------------------------------ > > Message: 5 > Date: Tue, 17 Mar 2015 22:23:53 +0000 > From: andy pugh <[email protected]> > Subject: Re: [Emc-users] PCB adapters for oscilloscope probes > To: "Enhanced Machine Controller (EMC)" > <[email protected]> > Message-ID: > <can1+yzwl750biemg6z80f2rargklmrkvk4pwekyakeremje...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > >> On 17 March 2015 at 22:16, Philipp Burch <[email protected]> wrote: >> >> Unfortunately, amplitude is quite something that matters. According to >> my simulations, the loading of the mentioned probe should be ok, it >> really only the problem of securely attaching it for doing the >> measurements. > > Could you use SMA or microdot connectors instead (and not use an > actual test probe?) > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > > > ------------------------------ > > Message: 6 > Date: Tue, 17 Mar 2015 23:30:15 +0100 > From: Bertho Stultiens <[email protected]> > Subject: Re: [Emc-users] PCB adapters for oscilloscope probes > To: "Enhanced Machine Controller (EMC)" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=windows-1252 > >> On 03/17/2015 10:21 PM, Philipp Burch wrote: >> Now the question: Does anyone here have an idea how or where to get some >> spares of those adapters? The part# 131-4244-00 does not seem to exist >> anymore. > > I'd take a small PCB with copper on both sides, drill a couple of holes > the right place and size, put four small pogo-pins in there and > line/solder the edge. The center-hole would have mounted one of the > spring-groundings soldered on the PCB to hold the lot and make a proper > ground connection on both sides of the PCB. > > Such setup, when small enough and grounded properly should be a > relatively good substitude IMO. > > -- > Greetings Bertho > > (disclaimers are disclaimed) > > > > ------------------------------ > > Message: 7 > Date: Tue, 17 Mar 2015 23:20:15 +0100 > From: Florian Rist <[email protected]> > Subject: Re: [Emc-users] PCB adapters for oscilloscope probes > To: "Enhanced Machine Controller (EMC)" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=US-ASCII; format=flowed > > Hi Philipp > >> Now the question: Does anyone here have an idea how or where to get >> some >> spares of those adapters? > > Do you have other probes available as well? It's much easier to find > these adapters for 2.5 mm probes. > > http://www.digikey.com/product-detail/en/PK106-4/PK106-4-ND/3587113 > > http://www.keysight.com/en/pd-2422998-pn-N4864A/25-mm-probe-tip-to-pcb-adaptor-vertical?cc=AT&lc=ger > > Using your probes, don't you think you'd bee good just using any > suitable receptacle for the tip and the ground spring contact on the > probe to connect to a ground plane? You could extract a single pin from > precision DIL socket for the probe tip. > > If you need 'full' pcb adapter for the 3.5mm probes and since this is > the LinxCNC mailing list, you could get a few carrier DIL socket for the > center pin and mill the outer sleeve from a piece of brass. > > https://www.buerklin.com/de/katalog/Carrier-IC-Fassungen-Typ-MPE-GARRY-MC-Metal-Carrier-DIL-B091000.html > > (I'm not 100% sure if a standard probe tip fits in..) > > > See you > Flo > > > > ------------------------------ > > Message: 8 > Date: Tue, 17 Mar 2015 23:49:08 +0100 > From: Florian Rist <[email protected]> > Subject: Re: [Emc-users] PCB adapters for oscilloscope probes > To: "Enhanced Machine Controller (EMC)" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=US-ASCII; format=flowed > > Hi > >> Could you use SMA or microdot connectors instead (and not use an >> actual test probe?) > > This is most probably not an option, as Philipp has to minimise the > influence of the probe on the signal. But the SMA connector might be a > good idea, still. > > A SMB jack has a outer diameter of about 3.6 mm, close to the probe's > one. So a straight PCB mount SMC plug might be able to hold the probe, > not as good as the suitable adapter would, but it might work. > > http://uk.rs-online.com/web/p/smb-connectors/2508694170/ > > > See you > Flo > > > > > ------------------------------ > > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming The Go Parallel Website, sponsored > by Intel and developed in partnership with Slashdot Media, is your hub for all > things parallel software development, from weekly thought leadership blogs to > news, videos, case studies, tutorials and more. Take a look and join the > conversation now. http://goparallel.sourceforge.net/ > > ------------------------------ > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > > End of Emc-users Digest, Vol 107, Issue 41 > ****************************************** ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
