Re: [volt-nuts] Redrafted schematic of Fluke 732A reference circuit

On 21/01/2018 18:27, Bob Albert via volt-nuts wrote: > I can't seem to make the link work. > Bob > On Sunday, January 21, 2018, 9:49:32 AM PST, David C. Partridge > wrote: > > Darn the URL got split: > >

Re: [volt-nuts] Offset voltage temperature drift in rail-to-rail opamps

Hi, Some years ago I designed in an RRI opamp that needed inputs down to ground and only a single rail was in use on that part of the product, the opamp certainly went very "soft" open loop gain leakage etc all getting much worse as a consequence of having the input tranistors/fets having to

Re: [volt-nuts] Fluke 332B

m > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > . > Hi Andreas, I also have a 3330B which could do with an updated chopper PCB, how many spare boards do you have ( I only need 1) Regards, M K __

Re: [volt-nuts] Short term "standard" cell?

On 12/03/17 17:27, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > On Sun, 12 Mar 2017 at 17:03, Frank Stellmach > wrote: > >> Hi Chris, >> >> >> >> Therefore, instead of poking around with these mediocre 10V >> "references", I'd look for a possibility to get

Re: [volt-nuts] Basic question concerning voltage references

On 20/02/2017 18:46, Russ Ramirez wrote: > I very much enjoy what is shared here. It has led me down the path of > learning more about Metrology in general and the pointers to Flukecal site > from here are appreciated. > > My question is this. If I measured a 10 volt reference known to be good to

Re: [volt-nuts] Fluke 5205a Repair

On 01/10/2015 03:15, David Garrido wrote: Hmm….. I am having one heck of a time tracking this one down folks. I am starting to entertain the idea that there is a possibility that somehow, me having this things wide open is causing my difficulties here. Besides having the “Lid

Re: [volt-nuts] Making a Reference IC

On 14/09/2015 12:08, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: On 13 Sep 2015 09:15, "M K" <m1k...@hotmail.com> wrote: There has been some of those references available second hand from ebay, mostly pulled, but some may be counterfeit, so look for sellers with pictures s

Re: [volt-nuts] Making a Reference IC

On 12/09/2015 23:12, Dave M wrote: I realize that better references are available. I was thinking of resurrecting a long-defunct Fluke 731 that I have in the garage. The reference IC is bad in it, and (1) I don't want to throw it away without a meager attempt at repair, and (2) I don't want

Re: [volt-nuts] Test Leads

On 21/07/2015 17:33, Randy Evans wrote: I recently acquired a Fluke 752A to go with my Fluke 732A and HP-3458A. Now I need to address the need for low thermal test leads. Does anyone have any suggestions for test leads that have low thermal contributions to measurements? I have looked at

Re: [volt-nuts] OCD About My HP419A Attenuator Switch Gold Plated Contacts

On 11/03/2015 06:26, Chuck Harris wrote: Does KOH really evaporate, and spread in the wind? I don't think it does. In my experience, the damage done by nicad's is limited to where the electrolyte dribbles, spatters, or wicks. Powdered electrolyte can get all over things, but usually it can be

Re: [volt-nuts] Calibration of voltage standards --- DIY switch/scannors

On 16/02/2015 06:45, 张利民 wrote: Hi M K, Sorry about that, I have posted a new thread on EEVBLOG with added photos. http://www.eevblog.com/forum/projects/diy-low-thermal-emf-switchscanner-for-comparisons-of-voltage-and-resistor-stand/ lymex/bg2vo -邮件原件- 发件人: volt-nuts [mailto:volt

Re: [volt-nuts] HP419A Meter Pegged to Right

On 11/11/2014 22:42, Stan Katz wrote: That clinches it. Brooke's Tek tour reminded me that I have on file a Service Scope from Tek entitled Washing Your Tektronix Equipment. I can follow those instructions less the drying for 24 hours in an oven at 125F. Doing so will probably have me kicked out

Re: [volt-nuts] Solartron 7081 Calibration

digit meter. M K ___ 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.

Re: [volt-nuts] LM399 Long term drift specification

On 15/09/2014 17:57, Tony wrote: On 14/09/2014 18:29, Andreas Jahn wrote: By the way: By accident I have found some ageing drift data of REF5050 on Malone's homepage: http://www.voltagestandard.com/Tech_Data.html For me it looks around 120 ppm drift within the first year. Unfortunately there

Re: [volt-nuts] HP 3456A AC cal

On 12/09/2014 00:30, Richard Moore wrote: I'm trying to get my head around the AC cal procedure for the HP 3456A -- there is no full-scale cal, just some extremely finicky tweaks for the bottom ends of three of the four ranges. I really don't understand how this is supposed to work, especially

Re: [volt-nuts] HP 3456A AC cal

. Nether meter come close to doing what the 3458A does. On Fri, Sep 12, 2014 at 12:04 AM, M K m1k...@hotmail.com wrote: On 12/09/2014 00:30, Richard Moore wrote: I'm trying to get my head around the AC cal procedure for the HP 3456A -- there is no full-scale cal, just some extremely finicky tweaks

Re: [volt-nuts] 732A and Prologix received

On 26/08/2014 16:05, Mike S wrote: After some more research, I think I've answered some of my own questions - Tellurium copper is used for binding posts, not because it has any special thermal or EMF mojo, but because it machines much better than pure copper. And, I suppose, because it

Re: [volt-nuts] Stuff for free and for sale

On 12/05/2014 03:31, Joseph Gray wrote: I'm posting this to both the Time Nuts and Volt Nuts list, as some folks don't belong to both. I need to get rid of some items. It has gotten so cluttered around here that I can hardly get any work done. Several items are free for the cost of postage.

Re: [volt-nuts] Stuff for free and for sale

On 12/05/2014 04:48, Joseph Gray wrote: 1000 Hz. Joe Gray W5JG On Sun, May 11, 2014 at 8:46 PM, Dallas Smith dosm...@outlook.com wrote: Hi Joe, Whats the frequency of the Fluke 510A? Dallas On 5/11/2014 10:31 PM, Joseph Gray wrote: Fluke 510A AC reference standard. Has original NiCad

Re: [volt-nuts] Batch of old reference zeners

Hi, I have an 8.5 digit wavetek, and a bunch of Solartron and wavetek 7.5 digit meters, but it seems to me that doing justice to the 329 references is going to need stable wirewound or foil resistors, and a few months will be only just long enough. MK On 10/03/2014 07:12, Andreas Jahn

[volt-nuts] FW: Fluke 845 Modification

Date: Sun, 29 Dec 2013 21:44:03 +0100 From: frank.stellm...@freenet.de To: volt-nuts@febo.com Subject: [volt-nuts] Fluke 845 Modification The Fluke 845 is famous for its high resistance measurements, due to the differential principle. But its

[volt-nuts] Datron 1271 /1281 service manuals?

Hi, does anyone have service manuals for the Datron/Wavetek 1271/1281 as I need to repair one. Thanks M K ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

[volt-nuts] ESI SR 1010 question

Hi, I have just bought an SR1010-10k for a good price and I was wondering if anyone knew what the interconnect is for the parallel and series parrallel shunt bars? Regards M K ___ volt-nuts mailing list -- volt

Re: [volt-nuts] cadmium solder alloy for low thermal emf?

From: j...@devereux.me.uk To: volt-nuts@febo.com Date: Fri, 31 May 2013 14:05:39 +0100 Subject: Re: [volt-nuts] cadmium solder alloy for low thermal emf? Andreas Jahn andreas_-_j...@t-online.de writes: Hello I do not imagine cadmium bearing solder being easy to acquire. The

Re: [volt-nuts] Seeking NIST DSS-5 AC Reference info

Hi, Try contacting the technical reference person on this page: http://www.nist.gov/calibrations/voltage.cfm#532 To: volt-nuts@febo.com From: xne...@luna.dyndns.dk Date: Tue, 23 Apr 2013 18:40:04 + Subject: [volt-nuts] Seeking NIST DSS-5 AC Reference info Gents This message was

Re: [volt-nuts] Improving Solartron 7071 and 7081

Hi David, I looks like the gate before TP3 gets a signal from off the PCB, how clean is that? first I would put a .1u to .22u small ceramic cap between power and ground of 403 then I would look at where TP3 signal goes to, does it feed off the PCB to anywhere else? a ring below ground

[volt-nuts] 7081 resistance accuracy issue

current can vary by 25ppm over a 20-23 degree house temperature then it is only accurate to 25ppm for resistance measurement except when used as a transfer standard. anyone else find a similar shift? M K

Re: [volt-nuts] 7081 resistance accuracy issue

is the input bias current that Mickle found. Regards, M K From: david.partri...@perdrix.co.uk To: volt-nuts@febo.com Date: Sun, 20 Jan 2013 11:13:00 + Subject: Re: [volt-nuts] 7081 resistance accuracy issue How long had the meter been powered on for when you started the test? Think days

Re: [volt-nuts] 7081 resistance accuracy issue

Hi Mickle, That is good to know, I know it is a positive tempco I have, I will just have to try a stable resistor and see what it gives me, but there is more checking to do first. Regards, M K Date: Sun, 20 Jan 2013 17:02:04 +0400 From: timk...@yandex.ru To: volt-nuts@febo.com Subject

Re: [volt-nuts] vSolartron7081 rom reading

I just noticed a gotcha, I need to set the key to calibrate before I may issue those commands, I guess I need a key. I have printed off the photo and measurements someone on this board did, now to get to a key shop... M K From: david.partri...@perdrix.co.uk To: volt-nuts@febo.com Date: Sun

Re: [volt-nuts] vSolartron7081 rom reading

Thanks for that, I thought someone had once said that would work, but until I know it better I have been trying to change it as little as possible. Regards, M K Date: Tue, 15 Jan 2013 18:08:02 -0800 From: cbl...@centurytel.net To: volt-nuts@febo.com Subject: Re: [volt-nuts] vSolartron7081

Re: [volt-nuts] vSolartron7081 rom reading

not in use. a drift of about 0.1 microvolts in about 3 weeks. Nothing else to confirm anything else as I have only just got it chatting out through the rs232. I will have to buy something to read them with. M K From: david.partri...@perdrix.co.uk To: volt-nuts@febo.com Date: Sun, 13 Jan 2013 16

[volt-nuts] solartron 7081 rom reading q

Hi, Finally able to talk to the meter through RS232. Is there any way to dump the rom contents using the RS232? or do the chips have to be put in a reader to get the values out? MK ___ volt-nuts mailing

Re: [volt-nuts] Solartron 7150plus - Chasing AC gremlins

there as an output. M K From: david.partri...@perdrix.co.uk To: volt-nuts@febo.com Date: Mon, 24 Dec 2012 14:19:43 + Subject: Re: [volt-nuts] Solartron 7150plus - Chasing AC gremlins Service manual (page 3.6 item 7) says to use 20VAC range, shorted inputs, adjust trim pot for zero volts

Re: [volt-nuts] Eppley 811381 standard cell

. There is a good pdf all about them on the NIST site. M K Date: Sat, 22 Dec 2012 09:19:19 -0800 From: bro...@pacific.net To: volt-nuts@febo.com Subject: [volt-nuts] Eppley 811381 standard cell Hi: I got an Eppley 811381 standard cell and am looking for info on how to use it. -- Have Fun, Brooke

Re: [volt-nuts] HP 419 (WAS: Fluke 335A versus HP 740B)

You could replace those 5 cells with two 3-3.6 volt lithium rechargeable cells and get a capacity boost as well. Date: Sat, 22 Dec 2012 12:22:03 -0900 From: cbr...@woods.net To: volt-nuts@febo.com Subject: Re: [volt-nuts] HP 419 (WAS: Fluke 335A versus HP 740B) On 12/16/12 2:34 PM,

Re: [volt-nuts] Fluke 335A/D

Hi Frank, where does the Fluke 3335b sit in the range of specifications? M K Date: Sat, 15 Dec 2012 12:38:00 +0100 From: frank.stellm...@freenet.de To: volt-nuts@febo.com Subject: [volt-nuts] Fluke 335A/D Hello, according to the different documents for the 335A and the 335D

[volt-nuts] fluke 335's

Did they go to anyone on here? M K ___ 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.

Re: [volt-nuts] fluke 335's

] On Behalf Of m k Sent: 16 December 2012 16:51 To: volt-nuts@febo.com Subject: [volt-nuts] fluke 335's Did they go to anyone on here? M K ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go

Re: [volt-nuts] Guildline 9154C

Hi David, If it is saturated cells then they do not travel well. M K From: david.partri...@perdrix.co.uk To: volt-nuts@febo.com Date: Fri, 14 Dec 2012 21:59:17 + Subject: Re: [volt-nuts] Guildline 9154C Enough to help me decide whether I want to buy one :) (I think it is 4

Re: [volt-nuts] Cropico ESC1 versus Tinsley 5646A

The Cropice only has 1.0 and 1.018etc volt outputs, so only of use as a transfer from stan dard cells. From: david.partri...@perdrix.co.uk To: volt-nuts@febo.com Date: Sat, 15 Dec 2012 02:02:18 + Subject: [volt-nuts] Cropico ESC1 versus Tinsley 5646A Both offered by the same

Re: [volt-nuts] Solartron 7150plus - Chasing AC gremlins

How about a leaky electrolytic? look for dried out ones, give the cans a quick spin, if it actually rotates it has leaked and dried out. Date: Fri, 7 Dec 2012 09:48:13 -0800 To: volt-nuts@febo.com From: e...@telight.com Subject: Re: [volt-nuts] Solartron 7150plus - Chasing AC gremlins I

Re: [volt-nuts] How long can standard cells last?

Hi, Well from that site the tempco is about 5 microvolts per degree, and from the bottom of the page: The un-saturated cell should have an e.m.f. of 1.0190 volts @ 20°C when new. When the voltage drops to 1.0183 volts, the cell should be discarded, as it is no longer stable. Most

[volt-nuts] 732 and 752 recently on ebay

Did anyone see the 732a and 752a pair that recently went for 1088 sterling (~1745 dollars us)!! MK ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to

Re: [volt-nuts] Traveling Standards

Date: Fri, 19 Oct 2012 21:34:38 -0500 From: smit...@c-c-i.com To: volt-nuts@febo.com Subject: Re: [volt-nuts] Traveling Standards On 10/18/2012 02:05 PM, Andreas Jahn wrote: Hello Bob, whats the matter with you. Infected by precision virus like me? Yep - and I have a question. What does

Re: [volt-nuts] hp 3458a advice

I recently bought a cheap module from Australia that converts from GPIB to USB... To: volt-nuts@febo.com From: p...@foxharp.boston.ma.us Date: Tue, 16 Oct 2012 11:31:49 -0400 Subject: Re: [volt-nuts] hp 3458a advice thanks joe, and to the other couple of people who responded privately.