For reasons which you would probably recognize, I ended up buying a Dekatran DT72A because it was simply too cheap to let go. That is a pretty amazing instrument. Appearantly the only thing Tegam changed in the new B version was the box, shaving a some kilos of the weight, as far as I can tell, everything else in the manual is identical up to and including the errors in the final schematic. I find somewhat ironic that my HP3458A can measure DC into tenths of PPM, while I have nothing in my lab that can reliably produce that, whereas it can only measure AC to tens of PPM, while I now have a fully passive box which can generate it down to tenths of PPM. So is volt-nuts DC only, or are anybody playing with AC also ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

Op 8-5-2012 21:32, Poul-Henning Kamp schreef: > For reasons which you would probably recognize, I ended up buying > a Dekatran DT72A because it was simply too cheap to let go. Ah, yes, we've all been there I guess :-) > That is a pretty amazing instrument. That, IMNSHO, applies to almost *all* esi / Tegam products. > I find somewhat ironic that my HP3458A can measure DC into tenths > of PPM, while I have nothing in my lab that can reliably produce > that, whereas it can only measure AC to tens of PPM, while I now > have a fully passive box which can generate it down to tenths of > PPM. Uhm, not to burst your bubble, Poul-Henning, but your box, amazing as it is, cannot actually generate anything. What you've bought is the AC equivalent of a Fluke 720, not a 5440. > > So is volt-nuts DC only, or are anybody playing with AC also ? Ah ... I've got a Fluke 5200A and two 540 transfer standards that I still need to overhaul. Alas, so much to do and so little time. Rob.

I don't think we should limit ourselves, at least not until the traffic gets so much that we need another group! I have a 6-digit version of the DT72A somewhere in storage, along with some phase angle standards that weigh a ton, and other bits and pieces. Steve On May 8, 2012, at 2:32 PM, "Poul-Henning Kamp" <phk@phk.freebsd.dk> wrote: > > For reasons which you would probably recognize, I ended up buying > a Dekatran DT72A because it was simply too cheap to let go. > > That is a pretty amazing instrument. Appearantly the only thing > Tegam changed in the new B version was the box, shaving a some > kilos of the weight, as far as I can tell, everything else in > the manual is identical up to and including the errors in the final > schematic. > > I find somewhat ironic that my HP3458A can measure DC into tenths > of PPM, while I have nothing in my lab that can reliably produce > that, whereas it can only measure AC to tens of PPM, while I now > have a fully passive box which can generate it down to tenths of > PPM. > > So is volt-nuts DC only, or are anybody playing with AC also ? > > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > phk@FreeBSD.ORG | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

In message <4FA97F9D.3040900@smalldesign.nl>, Rob Klein writes: >Uhm, not to burst your bubble, Poul-Henning, but your box, amazing as it >is, cannot actually generate anything. Well, I personally consider a precise ration a "thing" the same way I would consider 10V from a zener a "thing", but strictly speaking you are right of course. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

Hi, I have a bunch of Dranetz 305c's that measure to 0.01 degree of phase all the way up to 700Khz, but strangely one set of mainframe and a particular plugin manages almost 1MHz... M K > From: steve-krull@cox.net > Date: Tue, 8 May 2012 15:22:29 -0500 > To: volt-nuts@febo.com > Subject: Re: [volt-nuts] AC volt-nuttery... > > I don't think we should limit ourselves, at least not until the traffic gets so much that we need another group! I have a 6-digit version of the DT72A somewhere in storage, along with some phase angle standards that weigh a ton, and other bits and pieces. > > Steve > > > > On May 8, 2012, at 2:32 PM, "Poul-Henning Kamp" <phk@phk.freebsd.dk> wrote: > > > > > For reasons which you would probably recognize, I ended up buying > > a Dekatran DT72A because it was simply too cheap to let go. > > > > That is a pretty amazing instrument. Appearantly the only thing > > Tegam changed in the new B version was the box, shaving a some > > kilos of the weight, as far as I can tell, everything else in > > the manual is identical up to and including the errors in the final > > schematic. > > > > I find somewhat ironic that my HP3458A can measure DC into tenths > > of PPM, while I have nothing in my lab that can reliably produce > > that, whereas it can only measure AC to tens of PPM, while I now > > have a fully passive box which can generate it down to tenths of > > PPM. > > > > So is volt-nuts DC only, or are anybody playing with AC also ? > > > > > > -- > > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > > phk@FreeBSD.ORG | TCP/IP since RFC 956 > > FreeBSD committer | BSD since 4.3-tahoe > > Never attribute to malice what can adequately be explained by incompetence. > > > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

Poul-Henning Kamp wrote: > In message<4FA97F9D.3040900@smalldesign.nl>, Rob Klein writes: > >> Uhm, not to burst your bubble, Poul-Henning, but your box, amazing as it >> is, cannot actually generate anything. > > Well, I personally consider a precise ration a "thing" the same ... Interesting typo: I personally very rarely use the word "ration", though I use the word "ratio" frequently... but I find that I am all but incapable of typing ratio without first typing: ration and then back spacing over the "n". Glad to see I am not alone. -Chuck Harris