Re: [volt-nuts] HP 3457A

On 11 August 2013 03:19, Joseph Gray jg...@zianet.com wrote: If I want to buy a used 3457A, is it better to buy one as-is and send it for calibration, or perhaps spend a bit more and get one already calibrated? Just one example:

Re: [volt-nuts] Calibration and Certification - Trust and detail

On 11 August 2013 15:39, Robert Atkinson robert8...@yahoo.co.uk wrote: On a related issue to the 3457A calibration, I was asked to review an item at work last week (sorry can't say what or why). Looking at compliance certification by two fully qualified, internationally recognised labs, all

Re: [volt-nuts] Calibration and Certification - Trust and detail

On 12 August 2013 01:58, Charles Steinmetz csteinm...@yandex.com wrote: David wrote: How useful is this http://www.ebay.com/itm/281149723636 ? On the fact of it, the device would give one a reasonly high confidence something is working readlably well. I wonder if that is good enough for a

Re: [volt-nuts] HP 3457A

On 12 August 2013 17:43, Mike S mi...@flatsurface.com wrote: On 8/12/2013 12:21 PM, Charles Steinmetz wrote: No, you could not perform ANY traceable calibration with the 3458A itself, much less with any instrument you had calibrated with the 3458A, because *you* are not accredited That's

Re: [volt-nuts] Agilent calibration

On 14 August 2013 04:39, Orin Eman orin.e...@gmail.com wrote: Take a look at: cp.literature.agilent.com/litweb/pdf/5989-5729ENA1.pdf It's well hidden on the Agilent web site, but if you dig enough, you'll find it. You should get the As Received data for all Agilent calibrations. You only

Re: [volt-nuts] Agilent calibration

My HP 8720D VNA went off to Agilent yesterday. I know it is not volt-nut related, but if anyone wants to look at the certificate when I get it back, you are welcome to. I intended scanning it anyway. But I noticed something interesting looking at the prices of various calibrations in the UK and

Re: [volt-nuts] HP 3457A calibration?

On 20 August 2013 15:27, Rob Klein rob.kl...@smalldesign.nl wrote: Good video for when I can't get to sleep, though Yes, it does really drag on. He could say what he has to say in 25% of the time, by cutting out all the irrelevant rubbish. Dave

Re: [volt-nuts] HP 3457A calibration?

On 20 August 2013 17:14, Joseph Gray jg...@zianet.com wrote: I have replaced this type of battery in other equipment, so it isn't a big deal for me. I'm sure I can do it without losing the cal data. Joe Gray W5JG Given the discussion on here a week or two ago about Agilent not adjusting

[volt-nuts] Agilent calibration - certificate for a vector network analyzer (VNA)

Since there has been a few discussions about calibration, and in particular Agilent calibration, I thought I'd share my calibration certificate for my VNA which came back from Agilent (UK) last week.

Re: [volt-nuts] Agilent calibration - certificate for a vector network analyzer (VNA)

On 24 August 2013 18:55, Joseph Gray jg...@zianet.com wrote: David, Hi Joseph That is quite a difference between the two certificates. The Techmaster one doesn't tell you anything about what they actualy measured, or the uncertainties. You have to trust that they know what they are doing and

Re: [volt-nuts] Extender Card for Guildline 9975

On 18 Jan 2014 14:38, Joe Hobart n...@npgcable.com wrote: Does anyone have or know where I can buy or borrow a 12/24 contact extender card for the Guildline 9975? I have a single sided extender, but the signal demodulator board requires a double sided extender. Of course, it is this card

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

On 8 Mar 2014 05:57, Charles Steinmetz csteinm...@yandex.com wrote: Michael wrote: The battery is big concern to me. When I called Fluke, one of the rep said it should be shipped to them hot Because 732A's battery life is very limited, it should be shipped using Morning Service. I was going to

Re: [volt-nuts] Economical Standard Calibration

On 8 March 2014 21:44, Dallas Smith dosm...@outlook.com wrote: Hi nuts, This is my first post. The knowledge from contributors is amazing. Was wondering where one could economically get our voltage standards calibrated to some traceable standard since Joe Gellar suspended operations for his

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

On 9 Mar 2014 23:39, Jan Fredriksson j...@41hz.com wrote: I have a batch of voltage references ICs on the shelf, several thousand of each type. They all have date codes of around 1983, ie 30 years old. It would be great to have some drift data on them. Since you have so many, it would be

Re: [volt-nuts] Ayrton Shunt does double duty.

On Mon, 30 Apr 2018, 20:02 , wrote: > Leeds and Northrup Ayrton Shunt box Model 2664. > > Modified to do double duty as a precision resistor standard. I must admit I don't know what the purpose of the original unit is. Perhaps as part of a bridge given the

[volt-nuts] EU3458A - what appears to be a 3458A for sales in the European Union only.

, as new ones are too large! Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 01621-680100 / +44

Re: [volt-nuts] EU3458A - what appears to be a 3458A for sales in the European Union only.

On 14 May 2018 at 13:01, Dr. David Kirkby <drkir...@kirkbymicrowave.co.uk> wrote: > I'm puzzled why option 002, an upgrade of memory to 128 kb, is still an > option one has to pay for. With the cost of RAM what it is now, I'm > suprised the memor is not not standard. Perhaps the on

Re: [volt-nuts] Two 4338B high resistance meters fail on the same range - Keysight can't adjust EEPROM of either.

On Wed, 2 May 2018, 18:28 Charles Steinmetz, wrote: > Dave wrote: > > > This has certainty got me thinking about what might be happening, > although > > the fact Keysight have said they can't update the EEPROM, suggests they > > have the software to do it. > > Or does it

[volt-nuts] 3457A (6.5 digit multi-meter). Is it best to keep it on?

a suitable battery in the UK, and those in the US could not be shipped here. But that was a few years ago, so maybe things are different. Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered

[volt-nuts] 3457A battery replacement at Keysight - not as cheap as I thought it would be!

Last year I went down to Keysight for a course, and got a tour of their cal labs. I spoke to the person showing us around about the 3457A battery. He said if the battery was less than £35 or so, it could be replaced free of charge when the instrument was calibrated. So despite my 3457A's battery

[volt-nuts] Two 4338B high resistance meters fail on the same range - Keysight can't adjust EEPROM of either.

I"m pulling my hair out over an identical problem on two instruments. I am hoping someone might think of a possible cause I have not thought of. Sorry the post is a bit long, but this is not any easy problem to describe. I have an Agilent 4339B high resistance meter. This instrument essentially

Re: [volt-nuts] Two 4338B high resistance meters fail on the same range - Keysight can't adjust EEPROM of either.

On 2 May 2018 at 10:37, David C. Partridge wrote: > My bet is that they've lost the "secret sauce" for updating the EEPROM :( > So it's measuring as best it can with no calibration adjustments stored. > > Dave > Dave, Your comment got me to check something, which

Re: [volt-nuts] Two 4338B high resistance meters fail on the same range - Keysight can't adjust EEPROM of either.

On 2 May 2018 at 14:25, wrote: > "This reflects my experience when using > it to measure close tolerance resistors - measuring them at low voltages > gives poor results, but at higher voltage, the resistances are measured > more accurately." > > I noticed similar

Re: [volt-nuts] Two 4338B high resistance meters fail on the same range - Keysight can't adjust EEPROM of either.

On 2 May 2018 at 18:27, Charles Steinmetz wrote: > Dave wrote: > > This has certainty got me thinking about what might be happening, although >> the fact Keysight have said they can't update the EEPROM, suggests they >> have the software to do it. >> > > Or does it mean

Re: [volt-nuts] Cropico DO4A Digital Ohmmeter

On 29 April 2018 at 21:57, Nigel Clarke via volt-nuts wrote: > > Sorry, I realise now I could have explained better, I do know what > transistor it is but that's not the problem, this looks to be quite a > complex power suply/charger circuit, with at least three unmarked >

Re: [volt-nuts] Cropico DO4A Digital Ohmmeter

On 30 April 2018 at 10:45, Nigel Clarke via volt-nuts <volt-nuts@febo.com> wrote: > -Original Message- > > From: Dr. David Kirkby <drkir...@kirkbymicrowave.co.uk> > To: gandalfg8 <gandal...@aol.com>; Discussion of precise voltage > measurement <volt-nut

[volt-nuts] What's the probability of a random used 3458A passing a Keysight calibration?

he calibration cost, but if it fails, I get a full refund, including the calibration cost. I can understand a meter going out of spec over time, but if it can't be sorted out without thousands of dollars spent on it, then it is not such a good buy. But are more than 50% of 3458As like this? Dave Dr

Re: [volt-nuts] Any list members in UK who can accurately characterise a 732A and a 10K resistor

On 14 January 2018 at 15:40, David C. Partridge < david.partri...@perdrix.co.uk> wrote: > I've recently rebuilt a 732A and it seems stable, but what I don't know is > its actual output voltage down to the last ppm > > I've also acquired a Guildline 3330 10K standard resistor but again don't >

Re: [volt-nuts] What's the probability of a random used 3458A passing a Keysight calibration?

David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 01621'680100 / +44 1621-680100 On 16 January 2018 at 16:46

Re: [volt-nuts] What's the probability of a random used 3458A passing a Keysight calibration?

On 16 January 2018 at 13:44, Dr. David Kirkby < drkir...@kirkbymicrowave.co.uk> wrote: > Maybe an Agilent meter might be a sweet spot - not as old as an HP, so but > less stable than a newer Keysight. > > Dave > I meant to say, maybe an Agilent meter would not have the

Re: [volt-nuts] What's the probability of a random used 3458A passing a Keysight calibration?

On 16 January 2018 at 05:01, John Phillips wrote: > my experience is that most of the eBay meters that do not give errors are > very close to spec. These old meters do not drift as much as a new meter. > If you have a good 10 volts and 10k resistor calibration is a

Re: [volt-nuts] What's the probability of a random used 3458A passing a Keysight calibration?

On 16 January 2018 at 17:33, Dr. Frank wrote: > I meant to say, that the ADC ASIC determines crucially the stability.. and > this special serial number US28032500 is eventually affected by the AN-18 > service note. So that may be the reason, why they claim 2100$ for

Re: [volt-nuts] Bohnenberger electrometer DANGER

On 8 March 2018 at 07:19, Andre wrote: > Hi, re. capacitors it might be worth mentioning that the normal equation > assumes charge and discharge through a constant current. > What 'normal equation' do you mean? > Don't forget that the equation includes a non linear term so

Re: [volt-nuts] Bohnenberger electrometer DANGER

On 7 March 2018 at 06:29, Andre wrote: > Please be VERY VERY careful. To be honest its far safer to use CCFL > drivers and rectify them with camera diodes in series and the absolute > minimum capacitance for the job, shunted with a high value resistor. > The problem with 2.2 nF

[volt-nuts] Bohnenberger electrometer

Sorry this is not precision voltage measurement, but it is not unrelated. As a radio club project, we are building a simple electroscope, with no active components. The gold leave variety would work, but two bits of alluminum foil do too. My plan was to go one better, and build a Bohnenberger

Re: [volt-nuts] Open day at the National Physical Laboratory (NPL) on Thursday 17 May 2018.

On 3 Apr 2018 22:12, "Jeremy Nichols" wrote: > > Man, that would be wonderful! Pity the flight from California to the U.K. > is considerable more than £3! > > Jeremy > N6WFO Yes, its a shame that the plane ticket is not cheap. Perhaps you could consider a holiday to the UK to

[volt-nuts] Does desoldering and resoldering an LTZ1000A reset the ageing?

There seems to be plenty of evidence that meters like the 3458A improve stability over time. I believe that most/all is due to improved stability of the LTZ1000A. Does anyone know if desoldering one and resoldering resets the aging process? I see a number of used LTZ1000A ICs on eBay that look

[volt-nuts] Does desoldering and resoldering an LTZ1000A reset the ageing?

There seems to be plenty of evidence that meters like the 3458A improve stability over time. I believe that most/all is due to improved stability of the LTZ1000A. Does anyone know if desoldering one and resoldering resets the aging process? I see a number of used LTZ1000A ICs on eBay from China

[volt-nuts] Would you be concerned if the manufacturer does not have an uncertainty budget, so can't provide uncertainties in a calibration?

ion. Dave Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 01621-680100 / +44 1621-680

Re: [volt-nuts] Would you be concerned if the manufacturer does not have an uncertainty budget, so can't provide uncertainties in a calibration?

On 19 April 2018 at 16:42, wrote: > -a calibration certificate without uncertainsties is totally useless. in > is not even a calibration. > Having bought the meter, it is not so useless if it tells me it is working or not, but I do have some concerns I must admit. > -I have

Re: [volt-nuts] Would you be concerned if the manufacturer does not have an uncertainty budget, so can't provide uncertainties in a calibration?

e sent outside the UK to be calibrated. To be honest, I don't really NEED the uncertainties, but the fact they can't provide them does concern me a bit. Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, Unite

Re: [volt-nuts] Would you be concerned if the manufacturer does not have an uncertainty budget, so can't provide uncertainties in a calibration?

On 21 April 2018 at 09:32, Florian Teply <use...@teply.info> wrote: > Am Fri, 20 Apr 2018 14:37:22 +0100 > schrieb "Dr. David Kirkby" <drkir...@kirkbymicrowave.co.uk>: > > > The columns below, from left to right are > > > > Device type (

Re: [volt-nuts] How can I make a 2000 V DC meter with an input resistance of at least 100 T ohms?

On 24 March 2018 at 17:34, Jeremy Nichols wrote: > I made a high-value resistor using motor oil and a couple of stainless > bolts. It worked for what I was doing (testing an HP-425A > Microvolt-Ammeter) but calculated as only 8,500 Megohms. > > Jeremy > I had some discussions

[volt-nuts] Open day at the National Physical Laboratory (NPL) on Thursday 17 May 2018.

NPL opens their doors to the public once every 2 years. It is well worth going. Tickets are only 3.00 each, and that money is donated to a cancer charity. More details at http://www.npl.co.uk/open-house/ To make the most of it, you need to 1) Arrive early (14:00) 2) Leave when they close

Re: [volt-nuts] How can I make a 2000 V DC meter with an input resistance of at least 100 T ohms?

On 23 March 2018 at 01:07, Bob Albert via volt-nuts wrote: > I found several electrostatic voltmeters on ebay. The brand I remember > is Sensitive Research. > Bob > So something like this?

Re: [volt-nuts] How can I make a 2000 V DC meter with an input resistance of at least 100 T ohms?

On 23 March 2018 at 01:49, kc9ieq via volt-nuts wrote: > How about using (or building) an additional 2kV power supply and a > sensitive meter movement like a differential voltmeter, adjusting > for/measuring the null? Impedance at null will be theoretically infinate, >

[volt-nuts] How can I make a 2000 V DC meter with an input resistance of at least 100 T ohms?

on the 200 mV range, and there's no way that can be measured with an ammeter, which would require an ammeter with a full scale deflection of 1 fA, which is much smaller than the 2 pA FSD on its most sensitive range. Any thoughts? Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office

Re: [volt-nuts] Help needed identifying triaxial connector on HP 4339B high resistance meter - measures to 1.6 x 10^16 ohms.

On 23 March 2018 at 15:27, Jerry Hancock wrote: > what others do is just buy the available Trompeter triax connector and > file-off the host connector pins. I went through all the trouble to get > the right connectors and then looked at my Electrometer and saw someone had >

Re: [volt-nuts] Bohnenberger electrometer

On 6 March 2018 at 09:40, Dr. David Kirkby <drkir...@kirkbymicrowave.co.uk> wrote: > Sorry this is not precision voltage measurement, but it is not unrelated. > > As a radio club project, we are building a simple electroscope, with no > active components. The gold leave

[volt-nuts] Precision high resistance measurements / calibration of HP 4339B high-resistance meter.

. I know they should not be, but it is not a current instrument, so it's just possible the engineer did not know it could be adjusted. Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom

Re: [volt-nuts] Precision high resistance measurements / calibration of HP 4339B high-resistance meter. Fix?

On 2 March 2018 at 09:22, Andre wrote: > Maybe one bad resistor? I've read that tin whiskering can occur even on > relatively recent equipment, slower than lead free but still a problem. > I'd do a visual inspection just to see, shouldn't be an issue. > -A > An issue with

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

On 6 Jul 2014 07:12, John Phillips john.philli...@gmail.com wrote: ​They do really offer that service as​ long as you send them a complete meter... No missing parts. Well they will take a few missing screws and such. There is also the possibility someone has tried repairing it, but done so

Re: [volt-nuts] The averaging reference

On 18 Dec 2014 19:06, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message 5492f59e.8060...@free.fr, Joel Setton writes: In my search for the Perfect Volt, I'm thinking about building a reference voltage generator which would average the voltages generated If you want to do it

Re: [volt-nuts] The averaging reference

On 19 Dec 2014 19:30, Jan Fredriksson j...@41hz.com wrote: It's no coincidence that virtually all 8.5 digit DMMs use the LTZ1000. It's in a class of it's own. What do the 8.5 digit meters use if they don't use the LTZ1000? Dave. ___ volt-nuts

Re: [volt-nuts] The averaging reference

On 20 Dec 2014 21:18, Joel Setton set...@free.fr wrote: Jan, Thanks for a good summary f the pros/cons. Of course the LTZ1000 is much closer to the current state of the art, but the REF102 is far easier to use and to calibrate. I'm definitely not shooting for sub-ppm performance, if I can

[volt-nuts] Checking an LCR meter

I have bought an HP 4284A precision LCR meter. This is an old model with a basic accuracy of 0.05% and covers 20 Hz to 1 MHz. Converting the specifications into determining the uncertainty of a measurement is nontrivial, but I think it reasonable to assume the uncertainty will always be 0.05%.

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

On 27 January 2015 at 09:16, Orin Eman orin.e...@gmail.com wrote: There is a seller letting a slow trickle of them out there... they seem to be going for about $165. The current batch of two is around $100, but will probably be bid up. I just received one that I won. Seems to be working

Re: [volt-nuts] plastic caps on 3458A reference board

On 28 January 2015 at 18:56, Charles Steinmetz csteinm...@yandex.com wrote: The problem is that an LTZ1000 (or LM399) runs hot enough that most plastics you find lying around won't stand up to it for very long (some of them melt almost immediately when you power it up). This is true even of

Re: [volt-nuts] Design Spark PCB Design Package

On 5 Jan 2015 15:36, Randy Evans randyevans2...@gmail.com wrote: This is indirectly pertinent to the group since I am designing a PCB for the HP-419A and Fluke 845A modifications. Does anyone have any experience/comments on the Design Spark PCB design package? Is is a viable package for

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

On 27 Jan 2015 09:47, Orin Eman orin.e...@gmail.com wrote: There is a seller letting a slow trickle of them out there... they seem to be going for about $165. The current batch of two is around $100, but will probably be bid up. I am puzzled why there are so many reference boards that are

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

On 30 January 2015 at 12:25, Will willvo...@gmail.com wrote: The boards are factory rejects. I doubt all boards on eBay are in this category. Some are probably quite genuine, some may be rejects, and it would never surprise me if some are counterfeit. The problem is, I have no idea what ones are

[volt-nuts] Keysight seminar of possible interest to those in the UK

that interests me on the 17th June http://www.keysight.com/main/eventDetail.jspx?cc=USlc=engckey=2548118nid=-33166.920244.08id=2548118cmpid=1-6830540895 with the two locations more than 200 miles apart. It makes it just about impractical to attend both Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave

[volt-nuts] Seminar: Fundamentals of Low Current and Ultra-High Resistance Measurement

Google that and you should find a seminar sponsored by Keysight, scheduled for Tuesday, April 14, 2015 1:00pm ET / 10:00am PT (I'll convert to GMT later) Trouble is, it is streamed in a Windows format. Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge

[volt-nuts] Stabilising resistors

I have bought some resistors of 0.1, 1.0, 10, 100, 1k, 10k 100k Ohms. These are in little boxes with 4 BNC connectors spaced 22 mm apart. This sort of thing http://m.ebay.co.uk/itm/231460477406 although I paid a *lot* less. They are designed for use verifying the performance of LCR meters. I

[volt-nuts] Anyone know how to make stable inductors?

to satisfy anyone else. Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK. Registered in England and Wales, company number 08914892. http://www.kirkbymicrowave.co.uk/ Tel: 07910 441670 / +44 7910 441670 (0900 to 2100

Re: [volt-nuts] Anyone know how to make stable inductors?

On 20 August 2015 at 02:38, Todd Micallef tmical...@gmail.com wrote: Here is a DIY guide to making some lab standards. It is detailed with some component values. http://nopr.niscair.res.in/bitstream/123456789/4848/1/JSIR%2065%286%29%20510-513.pdf If this was April the first, I would be

Re: [volt-nuts] Anyone know how to make stable inductors?

> external influences as possible. Of course, the same couild be said of > any > > physical or electrical standard. > > > > Cheers, > > Dave M > > > > > > > > > > Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > > > >> I was look

[volt-nuts] Could you fall an HP 4-wire LCR meter into thinking you have a negative resistor?

I just sent an email by mistake, failing to finish it before hitting "send". The recent discussion about creating inductor standards from a capacitor and two resistors got me thinking. I suspect if you connected up an HP (or similar) LCR meter in a way not intended, you could make it appear you

Re: [volt-nuts] Making a Reference IC

On 13 Sep 2015 09:15, "M K" 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 showing it as old.. Several sellers have more than 1, but with one photo, so you would

Re: [volt-nuts] Low-cost voltage reference questions

On 25 Nov 2015 11:18, "Charles Steinmetz" wrote: > > I'm curious why you think the AD587/586 are better than other hermetically packaged references with better drift and noise specifications -- in particular, > > MAX6350MJA > AD588KQ > LTC6655CHLS8 > LTC6655BHLS8 >

Re: [volt-nuts] Low-cost voltage reference questions

On 29 November 2015 at 10:53, Charles Steinmetz wrote: Dave wrote: > > As regards humidity, I wonder if an reasonable attempt at sealing a package >> combined with silica gel inside would give an internal humidity that keeps >> fairly stable. >> > > That is exactly what I

Re: [volt-nuts] LTZ1000 project build

On 4 Jun 2016 20:44, "Poul-Henning Kamp" wrote: > > > In message <57527f8a.6070...@yandex.com>, Charles Steinmetz writes: > > >As I have mentioned before, for many years I have put precision circuits > >that may be sensitive to humidity into gasketed metal boxes with

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

On 26 June 2016 at 20:46, Todd Micallef wrote: > David, > > I have found that many sellers like to remove any calibration stickers or > tamper evident stickers. Not sure why they do that as a sticker does not > mean the item is calibrated. > The sticker on the front has

Re: [volt-nuts] Thermal EMF of common solder

On 26 June 2016 at 15:12, Andrea Baldoni wrote: > Hello All. > > I measured the thermal EMF of two common solder, the lead free > Sn96.5/Ag3/Cu0.5 and the old Sn60/Pb40. > Please excuse my ignorance, but how do you mean the thermal EMF of solder? Do you not need another

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

I got the 2001 that I ordered yesterday. There are a few things that make me feel uneasy about it, so I will probably return it. The calibration seal is missing off the front, which is obvious from the eBay photo, but also one at the bottom which looks as though one needs to open in order to get

Re: [volt-nuts] 3457A - should I preserve SRAM contents, or purposely corrupt them by removing power?

On 25 January 2016 at 11:12, Dr. David Kirkby (Kirkby Microwave Ltd) < drkir...@kirkbymicrowave.co.uk> wrote: > As noted in another thread, I want to replace a battery in a 3457A that > has not been replaced in at least 11 years. The instrument has not been > calibrated in t

[volt-nuts] 3457A - should I preserve SRAM contents, or purposely corrupt them by removing power?

for that, if it is drifting in one direction. Thoughts? Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK. Registered in England and Wales, company number 08914892. http://www.kirkbymicrowave.co.uk/ Tel: 07910 441670 / +44 7910 441670 (0900

Re: [volt-nuts] Wanted - UK source of a replacement battery (type LX 1634) for HP 3457A 6.5 digit multimeter

On 25 January 2016 at 15:23, Andrea Baldoni <erm191...@ermione.com> wrote: > On Sun, Jan 24, 2016 at 07:54:34PM +0000, Dr. David Kirkby (Kirkby > Microwave Ltd) wrote: > > > I've got a HP 3457A 6.5 digit multimeter - S/N 2703A04579. It's working > > fine, but

Re: [volt-nuts] 3457A - should I preserve SRAM contents, or purposely corrupt them by removing power?

On 25 January 2016 at 15:40, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > > In message < > canx10halwjxt+8ev8lywdqy9eez+anawihgqeyrzntsy80v...@mail.gmail.com> > , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: > > >I'm wondering if I wou

Re: [volt-nuts] Wanted - UK source of a replacement battery (type LX 1634) for HP 3457A 6.5 digit multimeter

On 25 Jan 2016 03:51, "Tom Miller" wrote: > > Looking through the service manual I don't see a connection from the battery to the NVRAM. I am sure I measured battery voltage on pin28 so I suspect a schematic error. Can someone that has one open verify that? My 3457 is in

[volt-nuts] Fall of SRAM voltage in a 3457A without external power

the voltage up from the mains just before removing it from the chassis. Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK. Registered in England and Wales, company number 08914892. http://www.kirkbymicrowave.co.uk/ Tel

Re: [volt-nuts] Fall of SRAM voltage in a 3457A without external power

On 25 January 2016 at 11:50, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > > In message < > canx10hcamahhhxqiao9bdzu03c2bbt787mr10rmnywk3oa8...@mail.gmail.com> > , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: > > >ESD and leakage

Re: [volt-nuts] Wanted - UK source of a replacement battery (type LX 1634) for HP 3457A 6.5 digit multimeter

On 24 January 2016 at 21:24, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > > In message < > canx10hadbw1u9ejc8_zgsk94k8az8vzg4ose+xngfwrali0...@mail.gmail.com> > , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: > > >Opening the mete

Re: [volt-nuts] Wanted - UK source of a replacement battery (type LX 1634) for HP 3457A 6.5 digit multimeter

On 24 January 2016 at 22:16, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > > In message < > canx10hcknsnxczjx8gccd2-t0j-jom7ybmncgdvis9ic3yv...@mail.gmail.com> > , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: > > >The SRAM actually

[volt-nuts] Wanted - UK source of a replacement battery (type LX 1634) for HP 3457A 6.5 digit multimeter

is supposed to have, but phyysically it fits, and I can get one easy enough from Farnell in the UK. Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK. Registered in England and Wales, company number 08914892. http://www.kirkby

Re: [volt-nuts] Wanted - UK source of a replacement battery (type LX 1634) for HP 3457A 6.5 digit multimeter

On 24 January 2016 at 22:46, Poul-Henning Kamp wrote: > > In message

Re: [volt-nuts] Just back from cal

On 8 Apr 2016 04:21, "Joseph Gray" wrote: > > In February, I sent my HP 3457A in for cal. In late March, I sent my > EDC VS330 DC Voltage Reference in for cal. Today, I just got the VS330 > back and thought I'd compare the two instruments. Did you send them to the manufacturers

[volt-nuts] Suggestions for 10 milli Ohm 0.04 % 100 W resistor

I have an HP 6674A power supply with option J06, which means that the PSU is 70 V @ 30 A rather than the standard 60 V @ 35 A . I've replaced a couple of bits in this and will need to replace some more, so it would be prudent to get this calibrated. The service manual calls for a 8.5 digit

Re: [volt-nuts] Keysight 3458A vs Keithley 2002 8.5 digit multimeters.

On 18 Jul 2016 17:34, "John Phillips" wrote: > > Most labs never turn 3458As off. The longer they are on the lower the drift > rate. I would rather have an 20 year old meter with new batteries than a > new meter. If one buys a used meter, one has no idea if it has been

[volt-nuts] Don't bother changing a 3457A battery if sending to Keysight for calibration.

Today I went to Keysight in Winnersh in the UK for a seminar on RF material measurements. We were given the opportunity to go for a 20 minute tour of the repair and calibration labs. Needless to say I took up the opportunity. There are 3 areas at Keysight in the UK. * Repair * Main calibration

[volt-nuts] Availability of 3458A in Europe after the end of 2016.

The 3458A page on the Keysight website is interesting. "Notice for European Union Customers: This product is not updated to EU RoHS compliance and can be ordered via Keysight directly or Keysight Authorized Distributors until 31 December 2016. Beyond this date, the product can still be purchased

Re: [volt-nuts] low emf solder

On 29 October 2016 at 14:51, NeonJohn <j...@neon-john.com> wrote: > > > On 10/28/2016 08:39 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > > > I wonder how practical it is to weld test leads, so there's no solder or > > thermal EMF. > > > > I kno

[volt-nuts] Is there a "standard" much better than a LTZ1000, but much cheaper than a Josephson Junction Array?

The question about the Josephson Junction Array got me thinking. I wonder if there are any sort of technologies that can produce a voltage with much better stability than the LTZ1000, but without the cost of a Josephson Junction Array. A sort of half-way house. BTW, I see some rather battered up

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

On 19 October 2016 at 20:15, Ken Peek wrote: > Well, I already have a 3458A, OK, quite an expensive multimeter. Otuside my budget for something I don't really need, but would like! $400K is *WAY* out of my budget. I was looking more for > something on the

Re: [volt-nuts] Is there a "standard" much better than a LTZ1000, but much cheaper than a Josephson Junction Array?

On 20 October 2016 at 00:08, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > > In message g...@mail.gmail.com> > , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: > > >The question about the Josephson Junction Array got me thinking. I wonder >

Re: [volt-nuts] Availability of 3458A in Europe after the end of 2016.

On 13 November 2016 at 14:17, Chuck Harris wrote: > RoHS does not apply to test equipment. > Where do you get that from? When I was looking briefly the other day, there did not seem to be a lot of exemptions. I'm sure Keysight must be a bit more on the ball than to put that

Re: [volt-nuts] low emf solder

On 28 Oct 2016 15:25, "Juris L" wrote: > > Found reference to optimal emf solder composition cadmium/tin alloy > (70 %/30 %) in JJ array measurement article page 12. I wonder how practical it is to weld test leads, so there's no solder or thermal EMF. I know that this will

Re: [volt-nuts] Calibration of 34401A

On 12 Oct 2016 10:31, "Poul-Henning Kamp" wrote: > > > In message <120112818.2234439.1476263954...@mail.yahoo.com>, Bruce Griffiths wr > ites: > > >Does anybody know if a 34401A can be adjusted by a competent 3rd party lab, > >or are the details of how to adjust the

[volt-nuts] Calibration of 34401A

I have a 'friend" (actually a person who I have never met, but is a pain in the ***). He sold a Agilent 34401A multimeter which the customer said is out of specification and can not be adjusted. Quickly scanning the measurent results, the meter is not showing results with any huge errors (say

Re: [volt-nuts] PCB Artist

On 14 Dec 2016 14:14, "Dan Kemppainen" wrote: > If it's a one off board, with a handful of components anything should work. You can always redraw it later in something else. If you have 500 components, differential signals, and controlled impedance stuff that's a different

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