[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] 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

Re: [volt-nuts] volt-nuts Digest, Vol 105, Issue 8

I doubt that it has anything to do with GDPR as the EU3458A has been around for at least a year. David ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow

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

[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] 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

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

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

simply cannot adjust these meters anymore due to lack > of software. > > Best regards, > > Charles I don't have a cal certificate - only a report of how it was received http://www.kirkbymicrowave.co.uk/tmp/Measurement_report_As_received_1-9957310275-1.pdf and an email saying

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 10:37, David C. Partridge <david.partri...@perdrix.co.uk> 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 g

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

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 -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby Sent: 02 May

[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] 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

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] 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] 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 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

[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

[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

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] 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 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

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] 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, >

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?

[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] 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

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] 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

[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] HP3458 ADC integrator

I eat humble pie - I re-checked the datasheets low limit of 550V/V it is (wow that's really low) David -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 23 February 2018 22:06 To: 'Discussion of precise voltage measurement

Re: [volt-nuts] HP3458 ADC integrator

> The datasheet I have found (Natsemi Sept 1995) lists 550 V/V = 0.55 V/mV. > Which I think is a bit low, but then, the opamp is old. Check other datasheets, that's definitely wrong David ___ volt-nuts mailing list -- volt-nuts@febo.com To unsub

Re: [volt-nuts] HP3458 ADC integrator

know except that when dealing with low level signals maybe they needed the extra gain. BTW LM6361 is 550V/mv not .55V (I assume that was a mistake in your post) ... Slew rates seem a bit different at +/- 15V supply as well. David -Original Message- From: volt-nuts [mailto:volt-nuts-boun

Re: [volt-nuts] HP3458 ADC integrator

The April 1989 HP Journal is mostly dedicated to the 3458A and there's an article about the dual slope integrator starting on page 8. There's also a nice discussion about it in Art of Electronics 3rd Edition starting on page 918 HtH David -Original Message- From: volt-nuts [mailto:volt

[volt-nuts] Reading out Calibration data from Datron/Wavetek 4808?

I really need to change the memory retention battery in my 4808. What I intend is to use a small floating PSU with a blocking diode to supply just under the battery voltage to the memory circuit, then unsolder and replace the battery. However mistakes do happen, so does anyone know of a way to

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

of precise voltage measurement Subject: Re: [volt-nuts] Redrafted schematic of Fluke 732A reference circuit David, Thank you for that - much easier to follow. I infer from this that you have a Spice model for the LTFLU. Can you elaborate, please? Roman > On 22 Jan 2018, at 2:15 pm, David C. Partri

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

OK folks here's another location for anyone who can't get it from eevblog.com: Dave -Original Message- From: volt-nuts [mailto:volt-nuts-bounces+david.partridge=perdrix.co...@febo.com] On Behalf Of m k Sent: 21

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

Darn the URL got split: <https://www.eevblog.com/forum/repair/fluke-732a-repair/?action=dlattach;attach=388476> Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 21 January 2018 17:44 To: 'Discussion of precise v

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

I have redrafted the schematic for the Reference Circuit on the A5 board using "normal conventions" so it should be easier to understand. I've included the components that are hosted on the A4 board for clarity. Q2 acts as current limiter. The file is a little large so you can find it here:

Re: [volt-nuts] Prema 6048 zero offset problems

] On Behalf Of David C. Partridge Sent: 18 January 2018 11:57 To: 'Discussion of precise voltage measurement' Subject: [volt-nuts] Prema 6048 zero offset problems Starting with a warmed up Prema 6048, if I power it off and then on, select 20V DC range, 4 second integration and connect to the 10V output

[volt-nuts] Prema 6048 zero offset problems

of: -10.000113 which is close to the expected reading of -10.06 - 0.000105 = -10.000111 I have mailed Prema about this problem, and will let you know what they have to say. Cheers David Partridge ___ volt-nuts mailing list -- volt-nuts@febo.com

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

Surely the AC errors if any must be associated with the A2 AC Convertor board - 03458-66502? Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Dr. Frank Sent: 16 January 2018 22:39 To: volt-nuts@febo.com Subject: [volt-nuts] What's the probability

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] 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

[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 4HV.org

Please go right ahead... -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Andre Sent: 15 January 2018 06:43 To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Any list members in UK who can accurately characterise a 732A and a 10K

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

Guildline 9330 nominal accuracy 2.5ppm. -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby Sent: 14 January 2018 23:03 To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Any list members in UK who can accurately

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

Oops that was a Guildline 9330 not 3330 -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby Sent: 14 January 2018 23:03 To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Any list members in UK who can accurately

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 resist

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

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 know its value - my 3458A says it is 10,000.43 ohms which I find rather hard to believe (way out of

Re: [volt-nuts] 3458A NVRAM (David C. Partridge)

-boun...@febo.com] On Behalf Of quark...@gmx.de Sent: 09 January 2018 10:42 To: volt-nuts@febo.com Subject: Re: [volt-nuts] 3458A NVRAM (David C. Partridge) Hello Dave, I have experienced the same issue with my programmer and found out it must be the slow "Power-Up to First Access (tPU)" of

[volt-nuts] List contents of user NVRAM in 3458A?

So the two DS1230Y NVRAMs store "user" stuff. Is there any way to list the contents? Thanks Dave ___ 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

Re: [volt-nuts] Anyone want a Dallas DS1220AD - only very slightly used!

Sold -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 11 January 2018 15:29 To: 'Discussion of precise voltage measurement'; hp_agilent_equipm...@yahoogroups.com; TekScopes Subject: [volt-nuts] Anyone want a Dallas DS1220AD

[volt-nuts] Anyone want a Dallas DS1220AD - only very slightly used!

I bought it to go into a Prema 6048 but it wasn't compatible (time to power on issue). It should be fine in an HP 3458A and I believe it will also work in a Tektronix 11A series plugin. It's only a couple of months old, so plenty of battery life yet. Dave

Re: [volt-nuts] 3458A question

have thought it would typically be less than that given that the 1 year limit is 0.00106mV (1.06Uv). Thanks again David -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 10 January 2018 10:25 To: 'Discussion of precise voltage

[volt-nuts] 3458A drift checking question

How long does the meter need to have been powered on before it makes any sense to perform the Service Note 18 drift test? Thanks Dave ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to

Re: [volt-nuts] 3458A question

Correction to -0.00060mV to -0.00070mV Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 10 January 2018 10:14 To: 'Discussion of precise voltage measurement' Subject: [volt-nuts] 3458A question After running an ACAL 0

[volt-nuts] 3458A question

After running an ACAL 0 with a four wire short in place I get a DCV reading starting at about -0.5 mV to increasing to about 0.00060 to 0.00070 mV over a minute or so at which point it seems to stabilise. Is this "normal" and if not what could be wrong (AZERO is turned on). Dave

Re: [volt-nuts] Neon bulbs for HP 3420B or 419A chopper

low a firing voltage so both fired. These fired at about 95-100V with a sustain at about 68V and do alternate. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 18 November 2017 14:08 To: 'Discussion of precise voltage

Re: [volt-nuts] 3458A NVRAM

Looks like 100% success - I followed the instructions at , and all was well. The only problem I encountered was that my "goto" ROM burner (Galep-4) had a problem reading the first byte of the FM18W08, always reading it as X'66' :(. I've emailed Conitec

Re: [volt-nuts] 3458A NVRAM

I purchased an FM16W08 (for the CAL RAM) and a pair of FM18W08 for the user data RAMs. I'll use 28 way SIOC to DIP adapter PCBs and will wire up the FM16W08 so it looks like a DS1220Y. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Dan

Re: [volt-nuts] 3458A NVRAM

Oops it seems like that should the FM1808 that is a replacement for the DS1230Y. -Original Message- From: David C. Partridge [mailto:david.partri...@perdrix.co.uk] Sent: 19 December 2017 13:28 To: 'Discussion of precise voltage measurement' Subject: 3458A NVRAM I'm looking at the A5

[volt-nuts] 3458A NVRAM

I'm looking at the A5 board in my 3458A. The DS1220Y and the two DS1230Y NVRAMs have 1997 dates, so should likely be replaced. I *think* the Ramtron FM1608-120-P is a direct "drop-in" replacement in this application for the DS1230Y. Is that right? If so I'll get some in from eBay. Is there an

Re: [volt-nuts] Neon bulbs for HP 3420B or 419A chopper

David wrote: > Then an A3C (NE-2U) shouldn't work. The drive voltage is 125V. Correct. > The operating current is 1.5mA (.15V/102R) in the 3420B, so I would expect > this to be the A2B (NE-2V) part. The NE-2V is another 700uA design current lamp, just like the CML A2B and A2B-T. Indee

Re: [volt-nuts] Neon bulbs for HP 3420B or 419A chopper

Then an A3C (NE-2U) shouldn't work. The drive voltage is 125V. The operating current is 1.5mA (.15V/102R) in the 3420B, so I would expect this to be the A2B (NE-2V) part. Interestingly the operating current for the 3420A is 2.45mA which you would think might suggest the A3C (NE-2U), but the

Re: [volt-nuts] Neon bulbs for HP 3420B or 419A chopper

I just searched for ne-2u on uk.farnell.com and came up dry. could you point me to the right page please? Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of george Sent: 17 November 2017 16:37 To: volt-nuts@febo.com Subject: Re: [volt-nuts] Neon

Re: [volt-nuts] Neon bulbs for HP 3420B or 419A chopper circuit

> to buy NEW bulbs from a reputable manufacturer who provides specs Any recommendations - I can't find a source in UK. I know Philips used to make them, but where I'd buy a few only knows. Thanks Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf

Re: [volt-nuts] Neon bulbs for HP 3420B or 419A chopper circuit

, David C. Partridge < david.partri...@perdrix.co.uk> wrote: > In an earlier post I quoted the following description of the > photo-chopper circuit from the 419A manual > > 4-43. Assume that DS1 lights when the input is applied to T2. Capacitor > C1 charges until th

[volt-nuts] Neon bulbs for HP 3420B or 419A chopper circuit

In an earlier post I quoted the following description of the photo-chopper circuit from the 419A manual 4-43. Assume that DS1 lights when the input is applied to T2. Capacitor C1 charges until the oscillator switches the input, and DS1 goes off. When the oscillator switches again, the

Re: [volt-nuts] 3420B chopper drive problem

In off-line discussion with Dr. Frank, it turns out that his proposal that the diodes should face in opposite directions was incorrect. The below is therefore wrong. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 08

Re: [volt-nuts] Unable to zero 3420B on 10**5 sensitivity

Still hoping someone can guide me in locating the offset in this chopper amp ... Thanks Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 10 November 2017 15:09 To: hp_agilent_equipm...@yahoogroups.com; 'Discussion

[volt-nuts] Unable to zero 3420B on 10**5 sensitivity

The first step of the calibration instructions 5-38 a) ask me to select the 1V range, and x10**5 sensitivity and to zero the meter using the front panel zero pot. I couldn't get that to zero. The next step which was to zero at x1 sensitivity using A4R16 works just fine. I checked and replaced

Re: [volt-nuts] Prema 6048 Cal switch confusion

on them as well as the date and model number. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 10 November 2017 10:19 To: 'Discussion of precise voltage measurement' Subject: Re: [volt-nuts] Prema 6048 Cal switch confusion Just

Re: [volt-nuts] Prema 6048 Cal switch confusion

On Behalf Of David C. Partridge Sent: 06 November 2017 16:28 To: 'Discussion of precise voltage measurement' Subject: Re: [volt-nuts] Prema 6048 Cal switch confusion I just had an email from Prema about this - - long story short: In this particular application, the DS1220AD isn't a good r

Re: [volt-nuts] Banana jack shorting straps

Mark I'm trying to imagine what you are describing - is this PCBs with 4mm banana plugs installed or a small PCB with two slots at 3/4" centres to match the socket spacing? If the latter is this intended to cover just two sockets or to short all four Force and Sense sockets together (if

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

I guess that depends on your definition of cheap :( Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Alan Ambrose Sent: 08 November 2017 14:31 To: volt-nuts@febo.com Subject: Re: [volt-nuts] Get 10K resistor calibrated in UK NPL i.e. the UK

Re: [volt-nuts] 3420B chopper drive problem

Well that would explain a lot! Both diodes are wired with the cathode to the neon! Does it matter which one I reverse? Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Dr. Frank Sent: 07 November 2017 16:32 To: volt-nuts@febo.com Subject:

[volt-nuts] 3420B chopper drive problem

I'm trying to resurrect a 3420B. I'm looking at the waveform at TP1 on the A2 board. This is supposed to be a square(ish) wave, but within a 6mS period, there should be two cycles of the signal, one with an amplitude of (say) 150mV, and the next cycle only 100mV. I think that the larger

Re: [volt-nuts] Prema 6048 Cal switch confusion

Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 03 November 2017 17:53 To: 'Discussion of precise voltage measurement' Subject: Re: [volt-nuts] Prema 6048 Cal switch confusion Randy, That's a very good thought. I think it is OK in this case

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

I have recently acquired a Guildline 9330 10K resistor (thank you Phil). One of my meters says 10,001.251 ohms at a room temperature of about 19.4C which is a long way from 2.5ppm or even 12.5ppm (allowing for 5C at 2ppm worst case). Now the question has to be where in the UK (ideally in the

Re: [volt-nuts] Prema 6048 Cal switch confusion

access. Randy Evans On Fri, Nov 3, 2017 at 2:54 AM, David C. Partridge < david.partri...@perdrix.co.uk> wrote: > This gets odder and odder. I put the new DS1220AD into the burner and > read it. Pretty random rubbish. > > So I cleared it to all FF and inserted into th

Re: [volt-nuts] Prema 6048 Cal switch confusion

To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Prema 6048 Cal switch confusion How about copying the contents of the old nvram to the new one? - Original Message - From: "David C. Partridge" <david.partri...@perdrix.co.uk> To: "'Discussion of precis

Re: [volt-nuts] Prema 6048 Cal switch confusion

the DS1220AD and the DS1220Y??? Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 02 November 2017 18:23 To: 'Discussion of precise voltage measurement' Subject: [volt-nuts] Prema 6048 Cal switch confusion I've got a Perma

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

Those appear to be the same scan of the user manual that is hosted at www.ko4bb.com and on my website. Good to see their recommendation of CALMET. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby (Kirkby Microwave Ltd) Sent: 03

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

oo far from you. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby (Kirkby Microwave Ltd) Sent: 26 September 2017 23:57 To: Discussion of precise voltage measurement Subject: [volt-nuts] Solartron (aka Schlumberger) 7081 I've been off

[volt-nuts] Solartron (aka Schlumberger) 7081

t was last calibrated, but I suspect long ago. Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd drkir...@kirkbymicrowave.co.uk http://www.kirkbymicrowave.co.uk/ Tel: 01621-680100 <01621%20680100> / +44 1621-680100 <01621%20680100> (0900 to 2100 UK time) Registered office: Stokes

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

On 23 September 2017 at 18:03, Tom Knox wrote: > If you want I will send you a few to play with for a few months. > Thank you very much. I'd like to have a play. I sent you a private email. Someone suggested using the DCV:DCV ratio mode to look at two references, but I

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

I've got two different, but not totally unrelated questions. 1) Does anyone know what is the power consumption of the 3458A reference board? I was thinking of getting one, boxing it up with a battery, that allowed it to keep running without mains power. I would like to know the energy storage the

Re: [volt-nuts] Datron Rear Input

You have the 4mm sockets? If so do yo9u have the top right one for the front connectors (Earth I think). The socket is still there but the plastic is long gone. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Dan McAlexander Sent: 22 September

Re: [volt-nuts] Best way to measure micro Ohms

On 18 September 2017 at 23:28, george wrote: > The reason that DC is used commercially to measure resistance is simple, > if you use AC you may well get the reactive component as well as the > resistance coming into play. > That may not be an an issue with a dual-phase

Re: [volt-nuts] Best way to measure micro Ohms

On 18 September 2017 at 18:36, Todd Micallef wrote: > Dave, > > Another meter is the Cambridge LOM-510A. I am not sure if it is in your > budget but there has been a review made on EEVBlog. There is one currently > on eBay with a current amplifier that I have never seen

Re: [volt-nuts] Best way to measure micro Ohms

On 17 September 2017 at 21:58, Mitch Van Ochten < mi...@vincentelectronics.com> wrote: > The Keithley 2002 uses DC but automatically takes a reading of any offset > voltage and subtracts it (offset compensation). Rated accuracy on the 20 > ohm range (2 years) is +/- 26 ppm, and with 10 averages

Re: [volt-nuts] Best way to measure micro Ohms

On 17 September 2017 at 20:12, wrote: > The question is what accuracy you need. > No a lot. I just want to find out if there's any voltage drops that are significantly higher than I would expect. The unit makes an RF transmission line, and the loss at RF is significantly higher

[volt-nuts] Best way to measure micro Ohms

t using AC was a no-brainer no very low resistance measurements, but commercial instruments don't use to use AC. Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd drkir...@kirkbymicrowave.co.uk http://www.kirkbymicrowave.co.uk/ Tel: 01621-680100 / +44 1621-680100 (0900 to 2100 UK time) Registe

Re: [volt-nuts] Update on 720A

I'm not going to open up oil-bath for a PM (unless someone wants to buy me a replacement 720A). D. ___ 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

  1   2   3   4   >