Agilent 6811B - instead of 700$ sallary , please help me  - Page 1
Forum section: electronics / testgear

author: eevblogfan
author_rank: Frequent Contributor
timestamp: June 27, 2013, 05:16:34 am
content: HelloSo I had to do some job at the storage room and I stumbled upon Agilent 6811B , last calibrated at 2005 .the device is missing the input AC cover and one knob , but apart of that he is in good shape and in working condition ,I think I saw one on Ebay for like 4.5K$ - Hence I am asking , Assuming the Boss will confirm me , Is there Any known risk ?Sure I can make A use of that beast , But I suspect I am going to calibrate it and add the missing knob etc .. and then resell the thing on EbayWhat would you do ?thank you

author: Unknown
author_rank: Unknown
timestamp: June 27, 2013, 05:27:48 am
content: Considering how they're going on ebay, I think that might actually not be too bad. The defects will limit how much you can get for it. Have you tested it thoroughly?

author: nctnico
author_rank: Super Contributor
timestamp: June 27, 2013, 05:50:45 am
content: When checking prices on Ebay always check 'sold listings' (maybe after checking 'completed listings') then you'll see for what prices people actually buy something. Many Ebay sellers ask grazy prices. Expect to get between $500 to $1500 for 'yours'.

author: eevblogfan
author_rank: Frequent Contributor
timestamp: June 27, 2013, 06:09:10 am
content: Heythank youNope mine is pretty good shape . the missing knob is no problem as we have spare parts , the functionality is perfect ,Anyhow - 500$ is too low for someone whos willing to pay some cash ( 30+ Kilo to ship )Besides that , I can Always keep it , it's nice gear , you can caricaturize many AC related stuff , and iF I am going to sell the thing , say within 4 years I'll have the need for that beast , it's damm expensive

author: sorin
author_rank: Frequent Contributor
timestamp: June 27, 2013, 10:49:19 am
content: Keep the moneyYou are in Israel and the shipping will cost too much.

author: ddavidebor
author_rank: Super Contributor
timestamp: June 27, 2013, 11:16:03 am
content: Keep the money, this gear is pretty useless and uncommon

author: KJDS
author_rank: Super Contributor
timestamp: June 27, 2013, 11:44:17 am
content: Quote from: ddavidebor on June 27, 2013, 11:16:03 am^^^This^^^ unless you have a specific use for it then it's no better than a doorstop. On the rare occasions you may need one, it's not high enough power for most practical applications.

author: eevblogfan
author_rank: Frequent Contributor
timestamp: June 27, 2013, 04:25:58 pm
content: Heysome update !I found *Good* Genrad decade resistance box ( Just the once dave has ) . and I may get it with that 6811B , so the genrad is absolute money right ?please shear with me your thoughts

author: Unknown
author_rank: Unknown
timestamp: June 27, 2013, 04:38:33 pm
content: It sounds like you REALLY want this power supply and are trying to find reasons to justify to yourself why it's a good decision. I'm not knocking that, sometimes you just get a jones for something... but the reality is you may not get as much for it as you think or have as much use for it as you think. If you just want it for a cool gadget to play with, then by all means, but think hard about whether it's worth $700 to you. And if it is, go for it. No one else can make that choice for you.

author: eevblogfan
author_rank: Frequent Contributor
timestamp: June 27, 2013, 04:50:45 pm
content: heyIt won't be 700$ , it will be roughly 350$ ( I am going to pay with Hrs , hence 50 Hrs for both , and the rest 50 Hrs are going to be money)Nope I really think that's gonna help me , 400Hz and variable voltage and many other measurements built in ,is really contributing device ,at 50Hz I get 350W draw , but at 400Hz I got 240W !!! ( Rugh numbers )Ps , the device was power supply , so I kept CP on the output , constant 180W it was , so at 50Hz it's 51.4% efficiency . while the 400Hz test got 75% !! ( and the crest factor raised up as well )

author: Vgkid
author_rank: Super Contributor
timestamp: June 27, 2013, 04:56:54 pm
content: Which model Genrad decade resistor is it, 33 is the top tier followed by the 32 then the 34.http://www.ietlabs.com/pdf/GR_Experimenters/1965/GenRad_Experimenter_Oct_1965.pdf

author: eevblogfan
author_rank: Frequent Contributor
timestamp: June 27, 2013, 05:14:19 pm
content: Nope , another one , like dave has in he's video , I think it was 0.01% ( please don;t quote me ) 7 decadesthat one has 13mOhm short resistance , and defective last two digits ( Mohm ) 9.3Mohm instead of 9.000Mohm , and 10.4Mohm instead of 10.000Mohmthe rest are within very precious

author: Vgkid
author_rank: Super Contributor
timestamp: June 27, 2013, 06:17:06 pm
content: If you have a chance to get it, then get it.

author: eevblogfan
author_rank: Frequent Contributor
timestamp: June 27, 2013, 07:33:04 pm
content: Hey VgkidCan you please tell me what is behind your recommendation ?as you may know ' if it's useless --- I won't touch it , hence I came to that thread and wanted to ask youPs : KJDS - 400VA is plenty for these days adaptors and such , that's good device with proper specswhen do you need to calculate these parameters above 400VA ? , well you should if you are working in some particular industry , say Pc's power supply etc...thank you

author: KJDS
author_rank: Super Contributor
timestamp: June 27, 2013, 07:43:45 pm
content: The only time you'll ever need to use one is doing design verification tests to make sure that a design will work on all the worlds mains supplies or that it isn't doing odd things with PFC. I've used similar a few times in my career, but it's always been on stuff that is closer to 1000W than 400. It's possible you'll need to use one, or maybe you just want to use one, but I've got far far better uses for $350 than that. YMMV

author: eevblogfan
author_rank: Frequent Contributor
timestamp: June 27, 2013, 07:57:57 pm
content: that is worth 2X~6X more then 350$in my country I can sell it to few customers pretty easily and with cash only , no vats no nothing ,but I seriously want one to myself ( yes , the world "want" fits okay here since the things I really need are not fancy analyzers right ? )thank you

author: Vgkid
author_rank: Super Contributor
timestamp: June 27, 2013, 09:21:34 pm
content: Quote from: eevblogfan on June 27, 2013, 07:33:04 pmHow much would it cost to pick up the decade resistor, It sounds as if it is a 1433 model. As stated in the below these are rather stable units, and the low short resistance can be imporoved by using the unit/ possibly cleaning the contacts. For the 2 possibly burned out decade ranges, you could possibly fix those ranges by replacing the resistors with high quality ones.http://www.ietlabs.com/pdf/Datasheets/1433.pdf

author: eevblogfan
author_rank: Frequent Contributor
timestamp: June 28, 2013, 07:03:07 am
content: HeyNope , We have bad unit in the job . I can take some good 1.0000Mohm resistors from there , and we donethe decade is just like Dave has - But has 1M steps and not just 100K . link :http://i3.ytimg.com/vi/fKrvtYS_6fI/maxresdefault.jpg

author: Vgkid
author_rank: Super Contributor
timestamp: June 28, 2013, 03:30:56 pm
content: That is what I would do.

author: eevblogfan
author_rank: Frequent Contributor
timestamp: July 13, 2013, 07:42:46 pm
content: HeyI ended up buying 2X 34401A's plus the decade resistance box , and got 200$ left as my salaryI have calibrated them to agree each other on any range >1V to the LSD !! ( obviously +-1PPM )and that after good 2~3 Hrs of warm up time ....does any one know if I can switch off the display ?I may work with them for many Hrs and I don't want to dimm they'r VFDs ....Or I may need to open new thread for that ... right ?I ren some Min max test and the beeper was annoying , so I searched the menu , and found "Display" on the System menu . I simply turned him off and that's itsilly me