PTB at the Maker Faire in Hannover - Page 1
Forum section: electronics / general

author: Henrik_V
author_rank: Regular Contributor
timestamp: July 28, 2017, 07:47:26 am
content: Hi Voltnuts,since it's our mission (since 1887 in behalf of the emperor) to realize and tranfer the units .... and it's fun ...we will be at the Maker Faire in Hannover (Germany) 26.-27. of August, together with a Fluke 5700, a 3458, hopefully a Fluke 8508 (not quite shure) and a nice KS LCR-Meter.Don't expect the last ppms, it's at the faire, no controlled temperature and sometimes running Tesla-coils nearbyand it's not an official PTB-calibration certificate for traceability.We have some spare power sockets for your gear* and we managed to do about 120 calibrations in two days in the last years ... 96% are handheld DMMs.I know it's more a international forum here, but perhapst I can motivate some colleages to do the same?Thousands of technic affine youngsters... in the last years more than 1% of the the visitors noticed us before (and packed a DMM)*) if our neighbours from Wellenkino don't trigger the fuse

author: try
author_rank: Regular Contributor
timestamp: July 28, 2017, 11:40:49 am
content: Highly recommended event!It's not just about the gear.You reach friendly people at the last line of defense*. If they don't have an answer to your question - who else could?Be careful: The barbed wire around their home facility is directed inwards.If you go there using public transport carrying a heavy load you can use the number 11 metro which stops directly in front of "Hannover Congress Centrum". Starting at the main station you go down the stairs into the subway area and take a subway going to station "Kröpcke" which is the next subway station southwards. Leave the metro and switch the platform to enter a number 11 metro running into the direction "Zoo".It takes about 15 minutes to get from the main station to the congress center.https://www.uestra.de/auskunft-und-fahrplaene/liniennetz/*The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institut in Germany.

author: quarks
author_rank: Frequent Contributor
timestamp: July 29, 2017, 07:02:08 am
content: Very interesting, thanks for sharing

author: tggzzz
author_rank: Super Contributor
timestamp: July 29, 2017, 07:32:22 am
content: Oh, that'ssotempting.Could you calibrate a Solarton 7081 DVM, a Transcell II 10.0000V reference, and a Dekapot Kelvin Varley divider?

author: HighVoltage
author_rank: Super Contributor
timestamp: July 29, 2017, 08:18:43 am
content: Thank you for sharing this, I was not aware of the PTB being at the maker fair.May be I will go this year

author: try
author_rank: Regular Contributor
timestamp: July 29, 2017, 10:20:20 am
content: Quote from: tggzzz on July 29, 2017, 07:32:22 amThere is a little report below the picture of the LM399-based reference:https://www.mikrocontroller.net/topic/398160Here are some missing details:A Solartron 7081 DVM has been calibrated last year (referred to as the 8,5 digit multimeter). It was given for free to the current owner and would have landed in the dustbin otherwise. He grabbed the opportunity and went to the fair to then successfully reduce his uncertainty about the device.A 7081 is just a multimeter and the Trancell is just a voltage source. I guess you won't have a problem calibrating it because they don't calibrate - you calibrate. You tell them either to provide a source or to measure your source. As far as the Dekapot is concerned I don't know what kind of measurement you intend to perform.You might want to bring in the proper cable with the special connector though.They usually bring in some funny devices as well like the 100kV-divider below.I calibrated its dimensions with my shoe-meter.

author: Henrik_V
author_rank: Regular Contributor
timestamp: July 29, 2017, 05:06:40 pm
content: Quote from: tggzzz on July 29, 2017, 07:32:22 amAs noted in the first post, we will bring a Fluke 5700, a HP3458 op 002, and a KS E4980A ... maybe that will be assisted by a Fluke 8508A, a 732A and a 752A , a 200g balance,... maybe ..a lot of silverware ... sometimes even gold-nuggets.All that gear always stay overnight at the PTB in Braunschweig, is transported to the fair early in the morning, build-up, warm-up, cross-checked, 10 o'clock: the crowd is coming, 8h for about 60 calibrations ,back to BS.All our gear is freshly calibrated, but again:DON'T EXPECT THE LAST PPMs AT THE FAIR ! It's not in the lab.(Reminds me to pass the 5700 over my fellows, to the 'german volt lab')Working horse is the 5700, about 96% of the devices are handheld DMM. You declare one (of up to 7) calibration point (U/I DC/AC Hz), we operate the 5700 (still standby) and hand you a cable with up to 5 connectors, you operate your device, you say OK, we set the 5700 in operation mode. You note the result.Voltage references, reference impedances ... as long as the 3458 or the E4980 (and maybe, I currently can't say for shure, we are working on it, a 8508) can measure it.A KVD is a different thing, and usually much more time consuming, unless you say , hook it up to the 5700 (or your Vref) and dial out 7 (+x) points measured by our DMM.For meters that deserve it, we have sockets for warm-up, invest some more work. We had some 6.5 up to 8.5 digit gear in the past(7081,345[6,7,8], some more 34401ff, Keithley 19x, 2k)I'm happy that my former fellow Roland will join us again, he's retired (... or so), has more than 40 years of experience in E calibration, but even he don't know all justification procedures by hart, so look up your cal procedure, pack the important pages of the SM, make a plan , make a plan B... and be there early!Yes, usually we bring some other 'naked' gear ... metrology porno

author: e61_phil
author_rank: Frequent Contributor
timestamp: July 29, 2017, 05:21:05 pm
content: Perhaps this is also the right place and time to shake some volt-nut hands?

author: TiN
author_rank: Super Contributor
timestamp: July 29, 2017, 05:26:37 pm
content: PTB. Indeed great chance to do some neat checks and maybe even convert some folks into baby volt-nutsI wish I'd be closer, K2002 fits into backpack very well.I'd agree withHenrik_Vas not to expect proper calibration of hi-end standards/meters.These are still delicate sensitive instruments and would not be just for faire type event with lot of charged buckets of water lurking aroundEven plain K2001/2002 calibration procedure takes up to 40 minutes, assuming everything work out first time. There is no such thing as quick 5 minute calibration of 7.5 digit+ meter.

author: tggzzz
author_rank: Super Contributor
timestamp: July 29, 2017, 06:24:44 pm
content: Quote from: Henrik_V on July 29, 2017, 05:06:40 pmToo many decades ago, when E Germany was very definitely still E Germany, I knew a Prof Werner Leonhard at TU Braunschweig. A pleasant town.QuoteNoted! Since the 7081 was very cheap (replacing the mains input socket added 50% to the cost!) and I've had to recondition it and construct a connector and lead,anythingwould be a pleasant confirmation of its (in)accuracyIt is now nice and stable, but after a couple of hours it indicates the Trancell voltage is 9.99965*V, i.e. 35ppm out. Not too bad, but... Must. Not. Become. A. Voltnut.QuoteUseful information; thanks.The Trancell has its own batteries and oven, so it would already be warmed up => two quick voltage readings, the 10V and Vzener.I was imagining I would hook the 1kohm input impedance KVD up to one of your voltage sources (any stable voltage <= 10V), then would take a photo of your DVM reading for each setting (3 decades plus a 100 division potentiometer. That's more than 7 readings (say 3*10+10, to be investigated), but each reading would be fast: click a decade switch, take a photo.I only got the KVD a couple of days ago, and it looks like my Trancell won't drive its 1kohm impedance; I've some work to do there.QuoteI've been doing some thinking and investigating options.I'dloveto do a full recalibration of the 7081, but that wouldprobablycertainly take too much of your time - doubly true as I would probably get it wrong the first time! Plus...Flying over with it would be a problem: too big for hand baggage, probably too delicate for hold baggage, and the hold temperature and any condensation would mean I would have to "cook" it in a blanket for a day, as per the manual! Driving would be too tiring and expensive with the EuroTunnel in the way. While I like trains, I'm not happy about carrying a 7081 that far!Hence I doubt I'll bring the 7081Which probably means you are breathing a sigh of reliefQuoteThat's an unfair advantage

author: tggzzz
author_rank: Super Contributor
timestamp: July 29, 2017, 06:30:00 pm
content: Quote from: TiN on July 29, 2017, 05:26:37 pmToo true! I was only thinking of attaching it and a calibrated meter to a voltage source, and then note the two meters' readings.But, for reasons I mentioned elsewhere, even that appears too ambitious.

author: tggzzz
author_rank: Super Contributor
timestamp: August 17, 2017, 01:37:46 pm
content: Plane tickets booked, so I'm comingI'll only bring my Trancell II 10V reference, so that should be easy to measure with a decent voltmeter (or a crap null meter with a decent voltage source!). It is internally powered by gel-cells, so it can be warmed-up before getting to the stand.My main concern is that the airport security mob might be fazed by "strange" electronics. Since they want verification that it turns on, I'll take a small DVM to show them the difference between on and off (and maybe a mains lead for turning the "ac on" light on). I'll also take copies of the regs w.r.t. batteries, just in case they object. Plus a screwdriver tip in case they want me to disassemble it.Any other suggestions to allay suspicions?

author: Henrik_V
author_rank: Regular Contributor
timestamp: August 17, 2017, 09:38:04 pm
content: Quote from: tggzzz on August 17, 2017, 01:37:46 pmWowI know they don't like srewdrivers ... but the tip / bit ??See you

author: try
author_rank: Regular Contributor
timestamp: August 18, 2017, 02:24:24 pm
content: tggzzz,be aware that we have a different type of mains connector in Germany.Transporting the device with either hand luggage or regular luggage could make a difference.You could as well try to contact airport security at both airports involved in time before traveling.

author: BBBbbb
author_rank: Unknown
timestamp: August 18, 2017, 03:12:56 pm
content: @tggzzzNo need to worry unless you plan on taking it as a hand luggage. Even then DMM w/o probes also no problem, but something sharp (even allen keys) and you can say good bye to it.So best is to put it in the regular luggage and no worries. I've been called for additional checks a few time (but very rarely) to open up my luggage and explain what's what. Sometimes they do it w/o calling you, so don't put a locker on the luggage.Usually you start explaining and they get bored and hurry you up to finish up. They don't like listening to the tech specs of my equipment

author: tggzzz
author_rank: Super Contributor
timestamp: August 18, 2017, 06:04:25 pm
content: This is all a significant change since I firstandlast travelled by air with electronics!The first time the NiCd cells had to be discharged and in hand baggage, so the equipment couldn't be turned on (not that that mattered at that time).The last time no electronics were allowed in checked baggage in the hold; that I can understand.Now it seems electronicsandcharged batteries are allowed as hand baggageandchecked baggage.... but I'm only too aware that batteries have brought down at least one airliner, possibly more. Now they would have been lithium and these are (allowably small) SLA gel-cells, but I still don't like the thought of what might happen to backpacks on conveyor belts.Ah, decisions, decisions...

author: Henrik_V
author_rank: Regular Contributor
timestamp: August 19, 2017, 10:15:46 am
content: What you can try...Phone the airport and ask if the luggage-(research)-station offer the service to store rejected stuff, in Hannover that was possible for 5-10€. BTDTBe at the port very early... communicate with the airport sec. ... If stuff get rejected , leave it there....You will always have the risk, that you can't bring it backbecause of the sec guys in Hannover. Talk to me at the faire about that...

author: tggzzz
author_rank: Super Contributor
timestamp: August 19, 2017, 02:41:42 pm
content: Quote from: Henrik_V on August 19, 2017, 10:15:46 amHey! I'm supposed to be the pessimistic grouchy old man; I'm sure you are too young for that!Anyway, you won't be that luckyIf that happens, I'll return by train! I'm <expletive deleted> if I'm leaving it behind

author: try
author_rank: Regular Contributor
timestamp: August 19, 2017, 06:30:51 pm
content: tggzzz,when will you be there, Saturday or Sunday?

author: tggzzz
author_rank: Super Contributor
timestamp: August 19, 2017, 06:44:03 pm
content: Quote from: try on August 19, 2017, 06:30:51 pmIn Hanover on Saturday morning, but probably too tired to appreciate the Faire. Hence probably Sunday.You'll recognise me: <deleted out of modesty>

author: tggzzz
author_rank: Super Contributor
timestamp: August 26, 2017, 04:17:49 pm
content: Great fun at the Faire today.The PTB people are a great bunch with some kit that I wished I could take home, someverystrange Tek kit that I didn't know existed, and one piece of geek porn that Ireallydidn't expect to see.No I'm not going to tell you what it is; you will either have to visit their stand yourself, or wait for them to tell you(But they were surprised they were able to bring it along).

author: TiN
author_rank: Super Contributor
timestamp: August 26, 2017, 04:37:42 pm
content: Photos or never happen'd.

author: babysitter
author_rank: Frequent Contributor
timestamp: August 26, 2017, 08:04:44 pm
content: Quote from: tggzzz on August 26, 2017, 04:17:49 pmIs it in a dewar?

author: Echo88
author_rank: Frequent Contributor
timestamp: August 26, 2017, 08:49:12 pm
content: JJA?

author: tggzzz
author_rank: Super Contributor
timestamp: August 27, 2017, 04:58:09 am
content: Quote from: TiN on August 26, 2017, 04:37:42 pmYeahI was going to take my camera but it wouldn't have easily fitted in my handbaggage. Really.Shame, because I would have liked to take some photos of their equipment (etc, he said tantalisingly), and other things at the Faire.

author: TheSteve
author_rank: Unknown
timestamp: August 27, 2017, 06:55:22 am
content: Quote from: tggzzz on August 27, 2017, 04:58:09 amNo camera in your phone?

author: tggzzz
author_rank: Super Contributor
timestamp: August 27, 2017, 05:30:48 pm
content: Quote from: TheSteve on August 27, 2017, 06:55:22 amCertainly not. A camera in a phone; what will they think of next! It does, however do SMS (but not MMS, obviously).

author: try
author_rank: Regular Contributor
timestamp: August 27, 2017, 07:57:59 pm
content: Hi ttggzzz,it was a pleasure meeting you! The reaction of the other users clearly show that they missed the event except for e61_phil that I met the day after. Kind of sad as people are alreading setting up calibration clubs trying to reduce uncertainty but not joining the opportunity to do so at the fair. What a pity!Did you know that the multimeter that measured your Transcell 10V reference was calibrated the day before?There is not too much uncertainty left about it. I hope it does not drift alot.I am too tired now to provide metrology porn pictures as we continued calibrating at home after the fair closed and I still have a cold. Maybe another time?Did you pass Hannover customs without any hassle or did they ask you to disconnect the battery inside for security reasons?

author: tggzzz
author_rank: Super Contributor
timestamp: August 27, 2017, 09:00:30 pm
content: Quote from: try on August 27, 2017, 07:57:59 pmAbsolutely no problem whatsoever in either direction, carrying everything as hand baggageI suspect it helped that I needed 4 trays for the x-ray, two for the usual bags/clothing and two for electronic equipment including a small multimeter with leads. There was a long queue, and they probably guessed I would have been delighted to discuss things with themPlus I'm old and I probably look more silly that threateningI'm now stuck at Heathrow waiting for the coach, and I will be interested to see if the voltage is the same when I get home. Could x-rays shift anything?Please pass on my thanks to your colleague that showed me the Tek 6R1; I missed saying goodbye.

author: try
author_rank: Regular Contributor
timestamp: August 28, 2017, 05:59:26 am
content: Quote from: tggzzz on August 27, 2017, 09:00:30 pmI'd say you are a friendly and polite voltage extremist.QuoteI guess so because I remember reading about robot breakdowns in Fukushima. But I honestly have no clue regarding the effects of little doses. You will have to return next year and extend the analysis of voltage references in terms of temperature, humidity and pressure to radiation.QuoteWell, I'm just a visitor at the fair. Will let you know nevertheless because I took a note of somebody's email address from the booth aside named "Wellenkino" (wave cinema) with all the beautiful old Tektronix oscilloscopes.A little hint for other readers regarding the metrology porn not yet disclosed:Balls of steel are not the best ones.

author: TiN
author_rank: Super Contributor
timestamp: August 28, 2017, 11:06:00 am
content: Sure, ball of pure silicon is much betterRight next to watt balance.

author: lowimpedance
author_rank: Super Contributor
timestamp: August 28, 2017, 11:30:00 am
content: Quote from: TiN on August 28, 2017, 11:06:00 amLOL. ................. any one else wanna Avogadro at this one too..

author: Henrik_V
author_rank: Regular Contributor
timestamp: August 28, 2017, 12:39:58 pm
content: We had a Si- Ball at the FaireNo fake, one of the first series (pure Si28 and Si29) , mono cristal, about 1kg , and pretty close to a perfect ball. I'm still impressed that I was allowed to bring it there regarding the price tag ... something between 'priceless' andAnd we actually had a JJA, a Quatum-Hall-standard and a JAWS (a JJA AWG) there too, naked without bottle.

author: Echo88
author_rank: Frequent Contributor
timestamp: August 28, 2017, 01:34:09 pm
content: Since you mention the Si-ball and remind me of the picture from the PTB-website where the temperature of it is measured by a thermocouple: Do you by any chance know Mr. Dietmar Drung? Please ask him if he maybe has a spare pdf of detailed schematics of his superior chopper amplifier.

author: Twoflower
author_rank: Frequent Contributor
timestamp: August 28, 2017, 07:20:20 pm
content: Yes I was really surprised to see one of these round Si balls. Thank you for the nice chat on the first day, giving some interesting insights of your work.And I really hope that I can be there if you do a "Tag der offenen Tür" event.By the way here's a picture of the precious gem.

author: lowimpedance
author_rank: Super Contributor
timestamp: August 29, 2017, 01:00:29 am
content: Interesting transport container ! , some one at PTB is now wondering what happened to his drawer handle. (clearly standards lab issue).Nice 'ball' BTW. and this is what metrology nuts love to see.... nice pictures of very expensive shiny artifacts...

author: Henrik_V
author_rank: Regular Contributor
timestamp: August 29, 2017, 07:02:26 am
content: Quote from: lowimpedance on August 29, 2017, 01:00:29 amWell, IKEA isn't that far awayWe are Makers too, we make unitsPictures are nice, but gageheads thrill .. see it with own eyes .... nealy touch it .. (just two layers of (plexi)glas inbetween)

author: doktor pyta
author_rank: Frequent Contributor
timestamp: August 30, 2017, 07:06:44 pm
content: Marco Reps prepared a video:

author: Henrik_V
author_rank: Regular Contributor
timestamp: September 11, 2018, 08:50:14 am
content: Little reminder for those close to Hannover (Germany):PTB will be again at the Maker Fair 2018 in Hannover on 15.-16. September. (MAKER UNITeS)Will be the 4. time, can we say traditionally ?Our 5700 and other nice gear is freshly calibrated and waiting for you(As always, no official tracability report, don't expect the last digits, expect FUN)

author: HighVoltage
author_rank: Super Contributor
timestamp: September 11, 2018, 09:12:20 am
content: Quote from: Henrik_V on September 11, 2018, 08:50:14 amThanks so much!May be this time I will make it to the fair.

author: Dr. Frank
author_rank: Super Contributor
timestamp: September 11, 2018, 09:35:54 am
content: I will definitely visit the Maker Faire, hoping to meet other volt-nuts also.I will be there either Saturday or Sunday, maybe we can arrange a common time frame here.I'll carry some artefacts to the fairFrank

author: e61_phil
author_rank: Frequent Contributor
timestamp: September 11, 2018, 09:47:17 am
content: I could be there on saturday. But not the whole day.

author: e61_phil
author_rank: Frequent Contributor
timestamp: September 11, 2018, 09:49:18 am
content: Quote from: Dr. Frank on September 11, 2018, 09:35:54 amOh, great!I put a LTZ1000 and my Fluke 5450A in my bag. Both measured on a calibrated Fluke 8508A not long ago.

author: tggzzz
author_rank: Super Contributor
timestamp: September 11, 2018, 10:52:57 am
content: Quote from: Henrik_V on September 11, 2018, 08:50:14 amWorth seeing and worthtravellingto see.Recommended. Take camera; last time they had some serious fodder for the TEA brigade In contrast with "BOSWELL. 'Is not the Giant's-Causeway worth seeing?' JOHNSON. 'Worth seeing, yes; but not worth going to see.'"

author: try
author_rank: Regular Contributor
timestamp: September 11, 2018, 11:21:41 am
content: Hi tggzzz,will you join us this time again?Anyway, I'll flood the booth with gear.And this time I do my best not to rip cables apart.I am looking forward to meeting the usual suspects from PTB and lots of voltnuts!Best regardstryP.S.: Henrik, don't forget spare cables and/or a soldering station + magic solder.

author: Henrik_V
author_rank: Regular Contributor
timestamp: September 11, 2018, 12:47:09 pm
content: Quote from: tggzzz on September 11, 2018, 10:52:57 amWell, again our friends fromhttp://www.wellenkino.de/are neighbours ... so a lot of beautiful boat anchors will be there too

author: tggzzz
author_rank: Super Contributor
timestamp: September 11, 2018, 02:27:35 pm
content: Quote from: try on September 11, 2018, 11:21:41 amSadly notBut that will leave room forotherpeople to have fun

author: Martin.M
author_rank: Frequent Contributor
timestamp: September 11, 2018, 03:58:29 pm
content: Quote from: Henrik_V on September 11, 2018, 12:47:09 pmif we have a common plug for all there can be again dark moments when starting up the tube Tek from the wellenkino(I am here but the fuse is gone...)PTB units:h = henryH = HaribogreetingsMartin

author: Henrik_V
author_rank: Regular Contributor
timestamp: September 11, 2018, 05:43:16 pm
content: Martin, should I better also bring some gauges for radiation?

author: Twoflower
author_rank: Frequent Contributor
timestamp: September 11, 2018, 06:13:39 pm
content: I hope that I'll be there too. Hopefully I'm welcome as I'm not (yet?) belonging to the group of Voltnuts but easily attracted by well designed technical stuff and people who like to talk about itMaybe I see something from that room again? Taken last Saturday in Braunschweig.

author: Martin.M
author_rank: Frequent Contributor
timestamp: September 12, 2018, 02:44:39 pm
content: Quote from: Henrik_V on September 11, 2018, 05:43:16 pmyou self have played with the 519 and you are still alive. So there is no Problem with EMP analyzingWhen you turn off the power switch and the instrument is still illuminating we can connect the FER with a geiger-Mueller-tube to count the problem directly.See you tommorowMartin

author: doktor pyta
author_rank: Frequent Contributor
timestamp: September 13, 2018, 08:04:08 am
content: @ TwoflowerWhat's this ?

author: Twoflower
author_rank: Frequent Contributor
timestamp: September 13, 2018, 05:23:00 pm
content: As mentioned I'm not an Voltnut. But the label says F9200 (could also be F8200) Precision Inductive Voltage Divider from Sullivan.

author: Messtechniker
author_rank: Frequent Contributor
timestamp: September 13, 2018, 06:03:18 pm
content: Pity I can't attend this time round.Birthday of the Missus, you know.But I plan to make it to the next maker fair in Hanover.Hope to meet some of you PTB guys and voltnuts then,even though I have nothing to calibrate except perhapstemperature and humidity for my BME 280 sensors.

author: branadic
author_rank: Super Contributor
timestamp: September 13, 2018, 06:39:52 pm
content: It's a SullivanF.9200precision inductive voltage divider-branadic-

author: Twoflower
author_rank: Frequent Contributor
timestamp: September 13, 2018, 06:50:40 pm
content: @branadicThanks for confirmation.The picture wasn't sharp as I didn't used a flash and it wasn't very bright in there. Plus the used font didn't helped to distinguish between 9 and 8. And maybe I have to check my Iconograph ;-)

author: Dr. Frank
author_rank: Super Contributor
timestamp: September 13, 2018, 07:11:19 pm
content: When will you guys from Bremen, Hamburg, and Hannover show up on the Maker Faire?I plan to visit on Saturday , between 11 - 16h, or so.How will we recognize each other?

author: e61_phil
author_rank: Frequent Contributor
timestamp: September 13, 2018, 07:32:18 pm
content: I will try to be there at 15:00.

author: Messtechniker
author_rank: Frequent Contributor
timestamp: September 14, 2018, 08:14:29 am
content: Quote from: Dr. Frank on September 13, 2018, 07:11:19 pmHow about a EEVBlog badge? Home made of course!

author: Henrik_V
author_rank: Regular Contributor
timestamp: September 14, 2018, 01:35:21 pm
content: I usually recognize them by the questions they ask and the gear they bring by

author: Martin.M
author_rank: Frequent Contributor
timestamp: September 17, 2018, 05:26:45 am
content: they was afraid to bring expensive multimeters for cal bec ..

author: tggzzz
author_rank: Super Contributor
timestamp: September 17, 2018, 07:41:35 am
content: Yet again they demonstrate good taste

author: Martin.M
author_rank: Frequent Contributor
timestamp: September 17, 2018, 12:17:44 pm
content: from left to right: +- 10% up to 0%greetingsMartin (Team of the left side..)

author: MiDi
author_rank: Frequent Contributor
timestamp: September 24, 2018, 12:23:08 pm
content: Quote from: Henrik_V on September 11, 2018, 08:50:14 amUnluckily, I could not be there and missed open day at PTB 8th septemberWould appreciate a night/weekend of the volt-nuts at PTB - just dreaming

author: Martin.M
author_rank: Frequent Contributor
timestamp: October 05, 2018, 05:04:17 pm
content: wellenkino + PTB at the makerfaire hannover,2016201720182019 hope to see you

author: Messtechniker
author_rank: Frequent Contributor
timestamp: October 05, 2018, 05:26:46 pm
content: On my list already: Maker Fair Hannover 17. und 18. August 2019

author: Martin.M
author_rank: Frequent Contributor
timestamp: October 05, 2018, 06:21:47 pm
content: some funny moments thereone of the makerfaire sponsors was this year the Sennheiser company.The job students of them (~ a zu bi) came with a promotion music box also to our place. Helloon my table was a polished ZP2 , z-meter build from Sennheiser. Comment of them: oh this is the old company logo, we don`t know this.comment from the wellenkino: you don`t know your own products, what is that please ??They went back and told it to the engineer, so we got a nice longer talk with him about oldies.Next mornig he came back and put a Sennheiser "RV54" for us on the table, tube AC mV Meter, build around 1954. It is now in restoration.Next year I bring this RV54 well restorated, for cal to the PTB table, then we want to see the Sennheiser team working with that directly on our tablehello Henrik,I have the first client for you for calibration: a Fluke 8300A options 1,2+5 (heavy nixie fluke)

author: Henrik_V
author_rank: Regular Contributor
timestamp: October 06, 2018, 08:00:26 pm
content: Quote from: Martin.M on September 17, 2018, 05:26:45 amIt was marked "WIDLARIZER" on the other sideHowever this is the now obsolete version since it used leaded parts.

author: try
author_rank: Regular Contributor
timestamp: October 08, 2018, 01:09:51 pm
content: The back side of the hammer can be found here:https://www.mikrocontroller.net/topic/398160#5565186Look at picture 19.Best regardstry

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 13, 2019, 08:27:39 am
content: Interesting initiative for sure.

author: hwj-d
author_rank: Frequent Contributor
timestamp: January 13, 2019, 09:59:20 am
content: Pic 4. Is it our Dr. Frank?

author: Dr. Frank
author_rank: Super Contributor
timestamp: January 14, 2019, 10:50:07 pm
content: That grey-headed guy, that's me, indeed.Pic 11 shows my LTZ box, my two VHP201 boxes and my Dave 'O 'Meter

author: LapTop006
author_rank: Unknown
timestamp: January 15, 2019, 10:57:41 am
content: Quote from: Dr. Frank on January 14, 2019, 10:50:07 pmHow many Daves/m^2 were you reading?

author: Henrik_V
author_rank: Regular Contributor
timestamp: August 13, 2019, 01:51:49 pm
content: Same procedure as last year?Same procedure as every year ! .... (OK the last 5 years)Just a short note: This weekend we have the faire again in Hannover.A 5700, a really fresh calibrated 3458 and more stuff is waiting for youPTB and Wellenkino are at about the same place than last time.

author: Martin.M
author_rank: Frequent Contributor
timestamp: August 15, 2019, 04:58:28 am
content: that little friend need a cal.

author: MiDi
author_rank: Frequent Contributor
timestamp: August 18, 2019, 09:20:39 pm
content: Some impressions from Saturdayand Sundayand one for Dave

author: branadic
author_rank: Super Contributor
timestamp: August 19, 2019, 09:20:51 am
content: Is that M71 and HighVoltage's F732A? They differ by 1.2ppm?-branadic-

author: e61_phil
author_rank: Frequent Contributor
timestamp: August 19, 2019, 11:43:05 am
content: Quote from: branadic on August 19, 2019, 09:20:51 amThe Fluke 732A (Wulf) was calibrated to 10V +0.6ppm in StuttgartThe 7000 (M71) was calibrated to 10V +1.7ppm10V + 0.6ppm + 12µV = 10V + 1.8ppmThe PTB 3458A agreed within 0.2ppmI would say, that is a very good result

author: Henrik_V
author_rank: Regular Contributor
timestamp: August 19, 2019, 12:17:26 pm
content: And always remember it's at the faire, 26 +x degC , and all kind of noise around ( I haven't heared any Teslacoils, but was to busy to see much from the faire)Was fun, thanks for visiting.See you next time.

author: Martin.M
author_rank: Frequent Contributor
timestamp: August 19, 2019, 04:13:46 pm
content: it`s a good question if he can reach the .6ppm when we are brushing the 549 there in <2m distance