Author Topic: Group buy - low thermal EMF LEMO connector for nanovoltmeter (34420/2182) (Read 6652 times)

balage · « **on:** September 05, 2019, 06:30:21 pm »

Hi Guys,

I am planning to buy low thermal EMF LEMO plugs for my Keysight 34420 nanovoltmeter. It is the FVN.1S.304.CLYC52Z, and the socket is the EVP.1S.304.CLY. Like in this post: https://www.eevblog.com/forum/metrology/diy-low-emf-cable-and-connectors/msg1667222/#msg1667222

Would anybody join? The price for the plug would be around 80 EUR, while the socket is around 60 EUR. EU fellows are preferred, however US shipment can be somehow done, I dont have much experience in it. The drawback is that the lead time is 3 months...

So?

Magnificent Bastard · « **Reply #1 on:** September 06, 2019, 04:07:39 pm »

Quote from: balage on September 05, 2019, 06:30:21 pm

Hi Guys,

I am planning to buy low thermal EMF LEMO plugs for my Keysight 34420 nanovoltmeter. It is the FVN.1S.304.CLYC52Z, and the socket is the EVP.1S.304.CLY. Like in this post: https://www.eevblog.com/forum/metrology/diy-low-emf-cable-and-connectors/msg1667222/#msg1667222

Would anybody join? The price for the plug would be around 80 EUR, while the socket is around 60 EUR. EU fellows are preferred, however US shipment can be somehow done, I dont have much experience in it. The drawback is that the lead time is 3 months...

So?

I already have a dozen of these for my 34420. Good idea though. Is there a quantity discount at some point?

balage · « **Reply #2 on:** September 06, 2019, 06:00:29 pm »

Quote from: Magnificent Bastard on September 06, 2019, 04:07:39 pm

I already have a dozen of these for my 34420. Good idea though. Is there a quantity discount at some point?

I hope so. I only wanna buy 2 or 3 for myself, and this is not qualifying a discount. That is why I want to check first if anybody is interested in. Nothing yet...

HighVoltage · « **Reply #3 on:** September 10, 2019, 08:19:48 am »

At what quantity is there a benefit in discount?
I am interested, if I the price is good.

TiN · « **Reply #4 on:** September 10, 2019, 08:49:22 am »

When I was buying my set, discount qty was starting from hundreds

balage · « **Reply #5 on:** September 10, 2019, 08:59:06 am »

At 10 pieces each of the plug costs 75 EUR, and the socket costs 55 EUR.

The next discount step is at 25 pieces. I don't even think we will have 10 pieces to order...

balage · « **Reply #6 on:** September 10, 2019, 09:02:52 am »

It is interesting, that Mouser hasn't got the 52 type, but has the same connector but with smaller cable diameter.

https://eu.mouser.com/ProductDetail/LEMO/FVN1S304CLYC37Z?qs=sGAEpiMZZMvf6myxbP4FpFVl7gYRtuT3GHaRshj6SqA%3D

syau · « **Reply #7 on:** September 10, 2019, 10:11:41 am »

https://www.mouser.com/ProductDetail/Keysight/34102A?qs=YCa%2FAAYMW003I91nmfKH%2Fg%3D%3D

Complete assembly cost USD$200+

balage · « **Reply #8 on:** September 10, 2019, 10:15:45 am »

The shorting plug also costs terrible...
But it is true for the triax cables, that you can make your own cheaper. And the quality can be the same as the original ones.

HighVoltage · « **Reply #9 on:** November 10, 2019, 07:50:16 pm »

Hello balage

Any news on this project?
I would be interested in a few of these connectors.

balage · « **Reply #10 on:** November 19, 2019, 11:59:35 am »

Hello HighVoltage,

The order is delayed, as I've started using the unplated copper binding posts, sold by TiN.

However I still need the LEMOs...

guenthert · « **Reply #11 on:** December 15, 2019, 11:13:08 pm »

Quote from: syau on September 10, 2019, 10:11:41 am

https://www.mouser.com/ProductDetail/Keysight/34102A?qs=YCa%2FAAYMW003I91nmfKH%2Fg%3D%3D

Complete assembly cost USD$200+

Consider yourself lucky! The same assembly for a Keithley 181/182 (#1507) with the odd #1486 connector isn't stocked by Keithley and the regular suspects. I found one individual who asked for 600 (!) chF

and others who won't publicly state the price -- one has to request a quote, which I read as "if you have to ask, you can't afford it."

MiDi · « **Reply #12 on:** December 16, 2019, 06:28:37 am »

~~Keithley 281/282 - secret instruments?~~
For K181/182 the connectors are Amphenol 97-3106A-16-11P and 97-3057-1008-1.
E.g. AB-Precision has assemblys for ~200EUR.

guenthert · « **Reply #13 on:** December 16, 2019, 05:17:58 pm »

Quote from: MiDi on December 16, 2019, 06:28:37 am

Keithley 281/282 - secret instruments?
Or do you mean 181/182?

Darn, yes. Corrected now in the post above to avoid further confusion. Thanks!

Quote from: MiDi on December 16, 2019, 06:28:37 am

E.g. AB-Precision has assemblys for ~200EUR.

Hmmh, oh well, better than 600chF, perhaps reasonable even for a professional application, but still out of my budget. Thanks though.

MiDi · « **Reply #14 on:** December 16, 2019, 05:26:47 pm »

Added connectors to last post for cheap DIY alternative.

alanambrose · « **Reply #15 on:** December 21, 2019, 12:12:51 pm »

If it helps any, I bought 4 x FVN.1S.304.CLYC37Z in 2016 from LEMO Benelux for EUR 46 a piece.

Alan

balage · « **Reply #16 on:** January 05, 2020, 09:29:14 am »

I have already ordered two plugs and one socket...

HighVoltage · « **Reply #17 on:** January 05, 2020, 09:52:13 am »

Where did you order them and how much did you pay?
Thanks

balage · « **Reply #18 on:** January 05, 2020, 12:39:07 pm »

From the local representative of Keithley/Tektronix.

For me plugs were 75 EUR each, and socket was 55 EUR.

Actually these connectors with copper-made contacts are not is the catalog of LEMO, but I should have asked for them. However (as I have to pay VAT) there is only a small difference between prices I've got and LEMO Benelux.

HighVoltage · « **Reply #19 on:** January 05, 2020, 01:18:48 pm »

I bought two original cables for the 34420A and a few 4-Pin LEMO connectors size 1.

With one of these LEMO connectors I made my own short. A 2 mm thick copper wire can be squeezed between the 4-pins of the LEMO and then I soldered this one piece copper wire to all 4 pins. It seems to work well.

balage · « **Reply #20 on:** January 05, 2020, 01:54:47 pm »

Nice shorting plug. Is this normal solder? Or a special one?

The connectors on the right, that have the locking pins. Do they fit into the sockets as well?

HighVoltage · « **Reply #21 on:** January 05, 2020, 03:08:34 pm »

Yes, the locking mechanism fits perfectly to the receptor at the 34420A and it locks perfectly tight.

I used normal solder for the copper wire to the gold plated connectors.
It seems to work well and I can not notice any thermal EMF.

Here are some more pictures of the short connector.

balage · « **Reply #22 on:** January 05, 2020, 04:45:41 pm »

Nice, great assembly!

Is the type of that connector public?

HighVoltage · « **Reply #23 on:** January 05, 2020, 07:33:29 pm »

Yes, it is a size 1 (9mm) standard LEMO connector that is very easy to source.

LEMO Number: FFA.1S.304
4 connectors (2 female, 2 male)

HighVoltage · « **Reply #24 on:** June 20, 2020, 12:13:30 pm »

I have finally received an original Keysight Short plug.
This is the Keysight Part number: 34420-81603
The retail price is: Euro 249,-

Here are some pictures of the assembly.
The LEMO connector is pure copper.


EEVblog Main Site	EEVblog on Youtube	EEVblog on Twitter	EEVblog on Facebook	EEVblog on Odysee

Author Topic: Group buy - low thermal EMF LEMO connector for nanovoltmeter (34420/2182) (Read 6652 times)

Share me