Re: [volt-nuts] Get 10K resistor calibrated in UK

Hi Dave; I do not think the resistance can be adjusted if that is what you are thinking, they will just document the actual value. But the most important thing is stability. Cheers; Thomas Knox From: volt-nuts on behalf of David

Re: [volt-nuts] Solartron (aka Schlumberger) 7081

Hi Dave; The 7081 is a really great meter if working correctly. It is up there with the Wavetek 1281, Fluke 8508, and Keysight 3458A. The only down side is the front panel connector, but I have seen it converted to Banana's. I think you will find it much better then the 3457A even with an

Re: [volt-nuts] Power consumption of 3458A reference board / fitting one in a 3457A

If you want I will send you a few to play with for a few months. Thomas Knox Sr Test and Measurement Engineer Ascent Concepts and Technology 4475 Whitney Place Boulder Colorado 80305 1-303-554-0307 act...@hotmail.com From: volt-nuts

Re: [volt-nuts] Power consumption of 3458A reference board / fitting one in a 3457A

Hi Dave; In a more detailed response to your question, i do not know a great deal about the 3457A but in recent years I have had multiple 3458A's on my bench at a time and I have found on those instruments the AD drift can very often be greater then the reference drift. A-Cal will correct the

Re: [volt-nuts] 3458A HFL Question

Thanks Frank, I had always assumed the HFL option was simply a select A9 reference like option 002, but I recently read that HFL instruments have/had improved A1 boards. I worked on an Agilent Branded meter with the HFL Key overlay and a HFL A9 but did not notice if the unit had a different

Re: [volt-nuts] Extenders for the Datron 4800 series of calibrators?

Hi Dave; Count me in. Cheers; Thomas Knox Sr Test and Measurement Engineer Ascent Concepts and Technology 4475 Whitney Place Boulder Colorado 80305 1-303-554-0307 act...@hotmail.com From: volt-nuts on behalf of David C. Partridge

Re: [volt-nuts] Wavetek Buttons, was Current Button for Datron calibrator (4800, 4805, 4807, 4808)

If anyone ever decides to set up 3D printing for Wavetek 1281.1271, 4920, and 4950 they would have a small gold mine on their hands. Those buttons all discolor very badly make a great instrument look old and dated. If they did them with the writing recessed in a contrasting color, which should

[volt-nuts] Sorry: Low-cost Josephson Junction Array Corrected link

Hi Ken; I corrected the link. There is a lot more to a voltage standard then the Zener, a very reasonably priced alternative to a JJA may be a Fluke 732A. These boxes have been in use for years and their characteristics have been extensively documented. This link may also be of interest.

Re: [volt-nuts] Low-cost Josephson Junction Array

Hi Ken; There is a lot more to a voltage standard then the Zener, a very reasonably priced alternative to a JJA may be a Fluke 732A. These boxes have been in use for years and their characteristics have been extensively documented. This link may also be of interest.

Re: [volt-nuts] Low-cost Josephson Junction Array

Hi Paul; I think there are some other manufactures and I have even seen several used systems in various states of disrepair on eBay over the past few years. But I think the NIST system probably represents a real value since the system price does not fully represent all the research and

Re: [volt-nuts] Low-cost Josephson Junction Array

Hi Ken; I am not sure what amount is reasonable. The NIST Programmable JJA system is around 400K and has accuracy of near 10 x -12. A number of the system components are available on the used market, and I cannot speak for NIST, but perhaps they would work with you if you sourced those

Re: [volt-nuts] Keithley 2001 - do you need to open it to calibrate it?

Hi All; One thing to check for 0n the 2001 is leakage on the electrolytic caps. Especially the early ones (Identifiable by the finer mesh fan filter) commonly have this problem and if unattended the oil eats the traces making repair a real nightmare. Cheers; Thomas Knox

Re: [volt-nuts] Datron 1271 AC Option

There are actually two AC options for the 1271 Option 10 and the high accuracy option 12 which I believe is the same as in the 1281 If that is true I would assume you could also plug and play a 1281 AC board. i would need to check my service manuals to be sure. Perhaps someone more knowledgeable

[volt-nuts] External Freq Reference Mod for 3458A?

Does any of the Volt-Nuts brain trust have any experience adding an external Frequency Reference on the 3458A. There is a 20MHz reference on the A/D board but externally clocking it has affected linearity collecting data off a 10VDC reference that looks a little like a hanging bridge I have

Re: [volt-nuts] Guildline Standard Resistors -- Oil bath temp?

Hi Richard; The temperature stability is more important then the exact temperature. But this is the exact info. Values below 10MΩ are calibrated in flowing oil at 25C, referred to the unit of resistance as maintained by the National Research Council of Canada (NRCC) or the National Institute

Re: [volt-nuts] How accurate is a fluke after 9 years

What is the group consensus on Vishay metal foil? Thanks Thomas Knox From: hol...@hotmail.com To: volt-nuts@febo.com Date: Sat, 16 May 2015 18:22:22 + Subject: [volt-nuts] How accurate is a fluke after 9 years Think twice about those Vishay metal film resistors... they have known

Re: [volt-nuts] How accurate is a fluke after 9 years

The Fluke 5700A and 5720A as well as the Wavetek 4808 and 4800A are pretty amazing I have seen several that appear to have been abused for years without a Cal and are still spot on. Same with many of the HP and Agilent 3458A's. It seems I see more broken then out of spec. Thomas Knox From:

Re: [volt-nuts] *WAY* too expensive for even Keysight to redesign

I think most of the top companies were founded by scientists and engineers and because of their roots in the scientific community they were very customer driven, but it seems recently most of the test and measurement companies have become stock-holder driven as the management with a background

Re: [volt-nuts] 3458A reference boards on ebay

Most likely the boards are real, especially if the boards are from a seller in Colorado since that is where Keysight in the past manufactured and serviced all 3458A's. They still do all calibration in Loveland (I am not sure if Loveland is where service is done today) but this would mean the

Re: [volt-nuts] Voltage standard spotted for sale, 4410

I am not sure the use of LM329's was a cost saving measure or compromise, actually the 4410 uses a different approch, it's basicly is a big oven. Guildline has been a Metrology leader for decades and has been a leader including temp measurements and oil baths so I for one would be interested

Re: [volt-nuts] Matched resistors

Hi Randy; I would look at Visha Foil resistors http://www.vishaypg.com/docs/63120/hzseries.pdf Hope that helps. Cheers; Thomas Knox Date: Wed, 16 Jul 2014 17:44:10 -0700 From: randyevans2...@gmail.com To: volt-nuts@febo.com Subject: [volt-nuts] Matched resistors I am building a 10V

Re: [volt-nuts] AC Voltage Measurement Standards

The ultimate AC standard would be NIST's AC Josephson junction array. Sam Benz and his team continue to make advances, pushing the accuracy and output level. They have also substantially reduced the needed electronics placing much of the peripheral electronics in a custom built two-U

Re: [volt-nuts] Buying HP-3458A

Be careful, Agilent's standard service is not that simple. Thomas Knox Date: Sat, 5 Jul 2014 16:08:26 -0700 From: randyevans2...@gmail.com To: volt-nuts@febo.com Subject: [volt-nuts] Buying HP-3458A I am in the market for a used HP-3458A and, in researching past messages, I came

Re: [volt-nuts] 732b transformer replacement

I would first attempt to purchase a OEM replacement from Fluke. You never know it may be reasonably priced. Cheers; Thomas Knox Date: Wed, 4 Jun 2014 17:16:37 -0400 From: pit...@williams-net.com To: volt-nuts@febo.com Subject: [volt-nuts] 732b transformer replacement My 732b is fine

Re: [volt-nuts] what in transfer accuracy

Isn't short term stability usually rated at 24 hours? I would think transfer accuracy (although perhaps not formally defined as a Metrology term) is more in minutes or second which would be important when you compare something like your JJA against your 732B. It would also be pretty obvious

Re: [volt-nuts] 3458a with 202: Slave Test Convergence (sigh)

The dreaded 202 convergence error, If you need help contact me off list. Best Wishes; Thomas Knox From: pit...@williams-net.com To: volt-nuts@febo.com Date: Thu, 27 Mar 2014 14:35:42 -0400 Subject: [volt-nuts] 3458a with 202: Slave Test Convergence (sigh) I know that HP will (gladly?)

Re: [volt-nuts] A Fluke 732A

Charles thanks for an engaging dialog, I think we generally agree, but have different interpretations of several words. I see calibration as a set of rules and procedures that a group has agreed upon, that when followed will allow tractability and repeatability to an agreed upon standard. And

Re: [volt-nuts] A Fluke 732A

Charles is difficult to disagree you are simply explaining the system that has evolved over decades that insures the accuracy of our standards labs, and I have found I am barely smart enough to get coffee for some of the Senior Time and Volt Nuts members. You have made your point very

Re: [volt-nuts] A Fluke 732A: Return it or keep it?

In my humble opinion your are best off first checking for a local Cal Lab with a Josephson Junction Array Voltage Standard. You can then drop it off and pick it up your 732A. I would imagine the day of abuse during shipping has more effect on uncertainty then the rest of the year combined

Re: [volt-nuts] A Fluke 732A: Return it or keep it?

I think everyone missed my point, Replace the current battery with ANY other type battery that is not destroyed by deep cyclng. Perhaps Ni-Mh would be better. Ni-Mh also has a very consistent output voltage (Low voltage drop) until nearly discharged. Also a quick Google search found a wealth of

Re: [volt-nuts] JJA progress report

The physics of a properly run JJA will always produce the same result so you do not need additional units for comparison. That is the point of a world wide quantum voltage standard defined as K J-90 = 483 597.9 GHz/V

Re: [volt-nuts] Valhalla 2720GS

BilI; I am sure you tried this, the model numbers are usually the default password. So try 2720 or Serial number or or . The manual usually has a way to reset then password. For example the 3458A has a default password of 3458 and 2 jumpers one to hard lock the calibration and one to

Re: [volt-nuts] Who bought a DT72A Dekatran Decade Transformer?

I think the PRT73 would make a better volume control since the GPIB allows the potential of adding some type of wireless remote. Thomas Knox Date: Mon, 27 Jan 2014 15:00:07 +0100 From: j...@41hz.com To: volt-nuts@febo.com Subject: [volt-nuts] Who bought a DT72A Dekatran Decade

Re: [volt-nuts] The 3458A A/D

The Fluke 8508 is actually more of a Wavetek/Datron 1281 under the hood. The real difficulty in introducing a 3458A competitor is that the scientific community has been characterizing the HP meter for three decades. It's quarks and idiosyncrasies are well know such as how it will drift, or

Re: [volt-nuts] What made a HP3458A so expensive

Actually in spite of it's high price I feel the 3458A represents a bargain. When it was introduced in 1989 it was $5900. A price it held for decades. Although designed in then 80's it's accuracy is still unsurpassed. The 8846A is much less expensive because it has only about a quarter the

Re: [volt-nuts] What made a HP3458A so expensive

if there will ever be a 3459A 9.5 digit meter? With a super miniture Josehpson Junction for a reference? Bill - Original Message - From: Tom Knox act...@hotmail.com To: Discussion of precise voltage measurement volt-nuts@febo.com Sent: Saturday, January 18, 2014 1:29 PM