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 the instruc

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 2018 00:47 To: hp_agi

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 m

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 unsubscribe,

Re: [volt-nuts] HP3458 ADC integrator

Looking your schematic, I see that you are using LT1225 for both U2 (U111) and U3 (U112) Why did you use those rather than LM6361 and AD848? Was it just because LTSpice didn't have models for them? It can make a difference ... As for why they chose to use 3 op-amps rather than 2? I don't kno

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-n

[volt-nuts] Prema 6048 new ROM images as at February 2018

A replacement EPROM with the latest firmware for the 6048 meters arrived from Prema on Saturday morning. You can download the zip file with the images of the EPROM and details on how to add the calibration data for your own 6048 to the image before you burn to your EPROM from:

[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] Anyone with a recently calibrated 3458A near Coventry in UK?

Well you never know, there might be someone. If there is, I'd be grateful for a cross check on mine. 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 t

[volt-nuts] Parts for 3458A

As a result of a poor colour description in the Keysight parts list, I expect to have some brand new parts for a 3458A available shortly. Keysight are sending the correct parts (5041-8819 and 5041-8820, which are a dark grey with a hint of a green tinge). They were described as green which they rea

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

on 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. P

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 J

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 prec

[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] Fluke 732A schematic re-drawn?

heaters. Bill - Original Message ----- From: "David C. Partridge" To: "'Discussion of precise voltage measurement'" Sent: Friday, January 19, 2018 4:16 AM Subject: [volt-nuts] Fluke 732A schematic re-drawn? > The schematic for the A5 Reference and Ov

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

m] 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

[volt-nuts] Fluke 732A schematic re-drawn?

The schematic for the A5 Reference and Oven Controller Board has to be one of the worst schematics I've seen in a while, breaking pretty much all the rules on making a schematic understandable. I suspect this was done deliberately. Has anyone ever re-drafted this (to include the A4 pass transisto

[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 of a Fluke 732A, I get a reading of: +10.47 If I reverse the polarity of the cables and allow the reading to settle down for a minute, I get a reading

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 o

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 res

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

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 a

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

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 a

[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 sp

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

-nuts-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)&quo

[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 Dalla

[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

x27;d 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 preci

[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 https://www.febo.com/cgi-bin/mailman/listinfo/vo

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

[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

y too 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 preci

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 ab

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 Kemppaine

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 lo

[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

I'm in the process of getting some A2B neons from Mouser. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Charles Steinmetz Sent: 18 November 2017 13:11 To: volt-nuts@febo.com Subject: Re: [volt-nuts] Neon bulbs for HP 3420B or 419A chopper David

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 dr

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 bulb

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 &deity only knows. Thanks Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Beh

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

at 6:38 AM, 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 un

[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 charge

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

This is quite different from the Fluke chopper circuits which do have the diodes wired for anti-phase operation (i.e. facing in opposite directions). Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 14 November 2017 09:

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; 'Discussi

[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 th

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

en 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

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

m] 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

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 arran

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 natio

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

Interestingly the PCB is marked to suggest the schematic is correct! And while the connections to the neons have been reworked, it would appear the diodes never have. Reversing one diode gave me a +ve going square wave at TP1 from 0V. Restoring that diode and reversing the other gave me a -ve

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

[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 should

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

Thank you, I've pinged Absolute Calibration an email asking for pricing. Question: This standard R is designed for use in a temperature stabilised oil bath. I don't have one of those. How much will this affect stability, and are there any other issues I need to worry about. Thanks Dave

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

--Original 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

[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 Midl

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

r attempts a memory 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

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

n...@febo.com] On Behalf Of Tom Miller Sent: 02 November 2017 19:05 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" To:

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

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'

[volt-nuts] Prema 6048 Cal switch confusion

I've got a Perma 6048 that I've trying to put into Cal mode. It just won't! The switch on the rear panel works OK, AFAICT when in the Cal position it connects ~WE on the DS1220 (pin 21) and ~W on the $864 SRAM (pin 27) to a 4K7 pullup to +5V and to the output of an LS00 which should be strobing t

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

October 2017 22:07 To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Solartron (aka Schlumberger) 7081 On 27 September 2017 at 11:09, David C. Partridge < david.partri...@perdrix.co.uk> wrote: > I assume you've seen my website: <http://perdrix.co.uk/ > Sol

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

I assume you've seen my website: ? The last corporate owner of the Solartron brand was Ametek, and their branch in Farnborough did calibrate them up to at least the late "noughties". I don't know if they still do. The full service manual and fa

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] 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 instruction

Re: [volt-nuts] Update on 720A

> I am thinking that the resistor leads have to leave the oil tank some way. > Is it possible that the insulator on whatever sort of feedthru has been > compromised? They are glass (or very similar) feedthroughs, so if that were compromised, I think I'd see oil ... There is no visual sign wh

Re: [volt-nuts] Update on 720A

> The bridge balance pot may not be so lucky, though. I don't think it needs > to be anything very special. As far as I can tell it is a very special pot wired with two resistance tracks. The coarse track has with two wipers connecting to the fine track which has just one wiper, all driven by

Re: [volt-nuts] Update on 720A

> My concern is you seemed to be going at this repair like you were working on > an oscilloscope, rather than a super precision instrument. More a case of: Oh my goodness how did this end up in this condition, and is there any chance I can bring it back from the edge. No, I didn't use super p

Re: [volt-nuts] Update on 720A

I can't replace the bad resistors in the A decade - they are in the oil bath and the manual says that in this case you sent the unit back to Fluke for a re-build. These days, I suspect they won't even do re-builds at all (or only at *silly* money), but make you buy a new one, and may well not

Re: [volt-nuts] Update on 720A

tor and a voltage calibrator. The calibration of a 720A requires that no current, none, zip, be drawn from the 720A on any port. It can only be done by using a voltage calibrator, and a null detector, as a differential voltmeter. Remember, and heed my words, *no* current may be drawn from

Re: [volt-nuts] Update on 720A

Update: After changing the resistor I added in series with R1008 (A decade position 1.0) from 204.8 to 202.4 Ohms (I wonder if this means that R302 is slowly increasing in value back towards nominal) and re-calibrating again, the A decade is now within 1ppm of linear (using the 10V range and no

Re: [volt-nuts] Update on 720A

nal Message - From: "David C. Partridge" To: "'Discussion of precise voltage measurement'" Sent: Monday, August 07, 2017 1:49 AM Subject: [volt-nuts] Update on 720A > I've added resistors in series with R1008 and R1044 to bring the resistance > for

Re: [volt-nuts] Update on 720A

ocess assures that the ratio from one step to the next is equal. Your values indicate that there may be other issues you did not properly account for. Good luck with getting it straightened out. BillWB6BNQ David C. Partridge wrote: >I've added resistors in series with R1008 a

[volt-nuts] Update on 720A

I've added resistors in series with R1008 and R1044 to bring the resistance for those parts of the A divider to a value that it would calibrate OK (two of the resistor sets in the oil bath very low in value). I also had to remove five turns (about 1.3 Ohms) from R1051 as the combined value of R31

Re: [volt-nuts] My 4600 problems

Problem solved! <http://www.eevblog.com/forum/metrology/problem-with-datron-4600/msg1271286/#msg1271286> Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 29 July 2017 18:55 To: 'Discussion of precise voltage

[volt-nuts] My 4600 problems

If you're interested to see my struggles with the 4600, I've opened a thread on EEVBlog: I've attached partial schematics for those in need of them. If you need any particular part of the schematic before I get the whole thing s

Re: [volt-nuts] Datron 4808 Opt. 70 without low frequency outputs

d to press the Store/x100 button (top left corner of lower left keypad). Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 20 July 2017 17:59 To: 'Discussion of precise voltage measurement' Subject: [volt-nuts]

[volt-nuts] Datron 4808 Opt. 70 without low frequency outputs

The Wideband Source for my 4808 appeared not to be working as the 4808 said "Error 9" when I tried to use it. While trying to work out what was wrong I checked the signals on the 15 pin cable between the 4808 and the Option 70 box. The signal on pin 9 was noticeable by its absence at the far end

Re: [volt-nuts] Documentation for 4808/Option 70 Wideband Source

t the rest >of the circuit. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 19 July 2017 09:54 To: 'Discussion of precise voltage measurement' Subject: [volt-nuts] Documentation for 4808/Option 70 Wideband Source I

[volt-nuts] Documentation for 4808/Option 70 Wideband Source

I've just received the 4808 documentation pack of which I spoke. I now have full documentation for the 4808 and the 4600. Sadly, the only document for the Wideband Source was the schematics. No User or other manuals were in the package. Naturally I'm delighted to have even just the schematics,

[volt-nuts] Manuals for Datron 4808

I believe that I will shortly have access to a full set of manuals for the Datron 4808, 4600 Transconductance Amplifier (Option 60), and Wideband Source (Option 70). Once I've got my stuff working, I will ensure that these get scanned and uploaded for general access. I'll keep you posted. Cheers

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

Are you interested in purchasing extenders for a Datron 4800 series calibrator? If so I'm considering getting some made up. Price will depend on how much interest and they won't be small PCBs. By way of guidance, back in 2011 I had 25 extenders of a similar size to the large boards made and the

[volt-nuts] Calibration keys for Datron 4800 series calibrators

I removed the key-switch from the rear panel of my 4808 and removed the cylinder. I don't advise you do this at home children - that part of the calibrator was not designed for easy maintenance. The local "lock-smith" said they couldn't make a key, but did manage to find a blank that fitted. It

Re: [volt-nuts] FS: Solartron 7081

ey! I sold one of these earlier this year for 1000 euro. ⁣Met vriendelijke groet, Rob Klein verstuurd vanaf mijn smartphone​ Op 13 jul. 2017 19:01, om 19:01, "David C. Partridge" schreef: >I have recently acquired yet another of these, and really don't need >quite so many

[volt-nuts] FS: Solartron 7081

I have recently acquired yet another of these, and really don't need quite so many of them. So I'm selling one of them. It was calibrated about 18 months ago, but when I checked it today after 24 hours warm-up it was reading well within specification on all ranges so I left it as found! The joy

Re: [volt-nuts] Problems with 720A

-Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 10 July 2017 16:21 To: 'Discussion of precise voltage measurement' Subject: Re: [volt-nuts] Problems with 720A Further study of the schematics leads me to think that

[volt-nuts] Datron 4800 Series Option 70 Wideband Voltage Source

Does anyone any data on Option 70 for the Datron 4808, the Wideband Voltage Source? My 4808 has this bolted to the bottom but it needs to be connected to the main unit via two cables, so any information on those cables would be most welcome. Any User or Service documentation for it would also be

[volt-nuts] Datron 4600 Transconductance Amplifier

I'm looking for the cables to connect this to a 4808 and for the Service Manual. It's also known as Option 60 if that helps any. Dave ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/v

Re: [volt-nuts] Problems with 720A

-Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 10 July 2017 14:28 To: 'Discussion of precise voltage measurement' Subject: Re: [volt-nuts] Problems with 720A I just realised that with the dials set for zero that R3

Re: [volt-nuts] Problems with 720A

-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 10 July 2017 13:13 To: 'Discussion of precise voltage measurement' Subject: Re: [volt-nuts] Problems with 720A If I have read that right I'm getting what I think are "odd" readings across R302

Re: [volt-nuts] Problems with 720A

3-4 on the oil bath and let me know the numbers? Thanks Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 10 July 2017 12:20 To: 'Discussion of precise voltage measurement' Subject: [volt-nuts] Problems with 720A You

[volt-nuts] Problems with 720A

You knew this was coming I'm sure: It was almost inevitable that there would be problems with the 720A! While trying to self-calibrate the 720A, (CAL A) the at the 0.1 and 0.10 settings the null meter was way out with around 100mV out of balance, and the A.1 and A.10 pots seemed not to do anythin

Re: [volt-nuts] Guidance requested

Frank and others, >1kV depends on the 100:1 divider of your special 3458A instrument, it can be >precise as a few ppm only, but unprecise as 12ppm, >as described in the specification. The 3458A readings for all ranges except 1000V are now within the spec of the Datron 4808 (between 2.8ppm and

[volt-nuts] Guidance requested.

So I have: 1) A Datron 4808 (not calibrated recently AFAIK, and no way to check), 2) A 3458A which is about 6 months out of calibration (sadly not by Keysight), 3) Three 7081s two of which are also 6 months out of calibration against the 3458A, 4) A 720A. The readings of the output of the Dat

[volt-nuts] Damage repair to front panel fof Datron 4808

Any suggestions gratefully received. Thanks, Dave ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo

Re: [volt-nuts] Fluke 332B

Thanks Charles, Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Charles Steinmetz Sent: 09 July 2017 13:31 To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] Fluke 332B David wrote: > When running through the calibration of

Re: [volt-nuts] Fluke 332B

ission of John Fluke Manufacturing Company, Seattle, Washington." > > From that statement, I expect that the Army manual is just a > reproduction of the commercial Fluke manual for the 332B. > > Cheers, > Dave M > > > David C. Partridge wrote: > >> Amongst

Re: [volt-nuts] Datron 1281 displays

Thanks Wim, As it happens I already had the datasheet ... I've sent am to Itron asking if there's anything that could be used as a substitute, but I'm not hopeful. Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Wim de Jong Sent: 08 July 2017 1

[volt-nuts] Fluke 332B

Amongst the stuff I recently acquired is a Fluke 332B (sn 4151). I found the manual for the 332D on the Fluke website, but can't find one specifically for the 332B apart from an incomplete US Army version. I have some questions: 1) Does anyone know where I can find the matching manual 2) If n

Re: [volt-nuts] Solartron 7081 serial comms

Looks like my memory is faulty and that I need a straight through cable (see my earlier post dated Friday, December 02, 2011). Dave -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 07 July 2017 17:12 To: 'Discussi

Re: [volt-nuts] Solartron 7081 serial comms

Addendum: Serial port will talk to a Solartron 7151 OK. -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 07 July 2017 13:44 To: 'Discussion of precise voltage measurement' Subject: [volt-nuts] Solartron 7081 serial c

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