Author Topic: 4-wire short - DIY  (Read 3142 times)

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Offline MiDi

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4-wire short - DIY
« on: December 21, 2017, 07:28:58 pm »
I make it short: it's just a short :D
Project is in Public Domain and the actual project files are on Github.

This item is intended for use with DMMs capable of 4-wire measurement.

Features:
- standard 19mm space between plugs
- low thermal emf design
- gold plated quality plugs
- easy pull out with handle
- low resistance: <5mOhm between HI and LO plugs

Should be suitable for all devices with standard jacks (like Keithley 2000-Series)

NOT SUITABLE FOR DEVICES WITH:
- jacks are even / flush mount with the front panel (e.g. Fluke 8846A)
- inner contacts of the jacks are heavy recessed (e.g. Keysight 344xxA-Series)


The plugs are a bit shorter than standard bananas and the pullout needs some space at the bottom.

Borderline:
Keithley DMM7510 (only small elevation of jacks from front panel)

Review from Dave
Discussion

xDevs

There is a new batch international available on ebay germany - just search for "4-wire short" (include the quotation marks).

First batch gone to: Australia, Sweden, Taiwan, Japan, Great Britain, Spain, Austria, Germany, Russia, USA


Front 3d


Back 3d


Front assembled


Back assembled
« Last Edit: July 20, 2018, 02:25:19 am by MiDi »
 
The following users thanked this post: kado, beanflying

Offline perdrix

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Re: 4-wire short - DIY
« Reply #1 on: February 10, 2018, 12:28:04 pm »
I bought one - like it.  Did you consider doing one for the 3458A which has different spacing for the sockets?

Dave
 

Offline Insatman

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Re: 4-wire short - DIY
« Reply #2 on: February 10, 2018, 04:47:22 pm »
Where did you source the gold plated plugs?  I've been looking for those for another project
Retired Pulsed Power Engineer/Physicist...now I just dabble in electronics
 

Offline MiDi

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Re: 4-wire short - DIY
« Reply #3 on: February 10, 2018, 07:29:53 pm »
I bought one - like it.  Did you consider doing one for the 3458A which has different spacing for the sockets?
Thanks for the feedback, Dave!
I thought about doing one for my 3457A (3458A and others should have the same spacing), but would prefere a PCB only Version.
As it turned out there is already a design with PCB only.
But if there is enough demand for my design idea, would think about doing it.

Where did you source the gold plated plugs?
Got the Multi-Contact SA404 22.1054 from german distributor voelkner, conrad has them too, but higher price - but not shure if they sell to your country.
Perhaps a search could turn out a distributor for you - if there is no option, could buy for you - send me a PM.
 

Offline perdrix

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Re: 4-wire short - DIY
« Reply #4 on: February 13, 2018, 02:08:16 am »
OK Thank you, I ordered Mark Sims' (Texaspyro) PCB version from Oshpark

Dave
 

Offline Insatman

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Re: 4-wire short - DIY
« Reply #5 on: February 13, 2018, 12:38:12 pm »

Where did you source the gold plated plugs?
Got the Multi-Contact SA404 22.1054 from german distributor voelkner, conrad has them too, but higher price - but not shure if they sell to your country.
Perhaps a search could turn out a distributor for you - if there is no option, could buy for you - send me a PM.
[/quote]

I'd be interested in buying one of your 4 terminal shorts plus 8 more contacts.  PM me if interested and we'll try and work something out.
Retired Pulsed Power Engineer/Physicist...now I just dabble in electronics
 

Offline cowasaki

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Re: 4-wire short - DIY
« Reply #6 on: June 22, 2018, 04:57:01 am »
MiDi, would you happen to have any of these left?
 

Offline MiDi

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Re: 4-wire short - DIY
« Reply #7 on: June 23, 2018, 05:42:41 am »
At the moment there are no more left.
But if there is a couple demand, I would do another batch.
Do you want only one or more?
 

Offline cowasaki

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Re: 4-wire short - DIY
« Reply #8 on: June 23, 2018, 05:45:38 am »
Just one.
 

Offline BNElecEng

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Re: 4-wire short - DIY
« Reply #9 on: June 23, 2018, 06:26:22 am »
Count me in if you are planning another run please.
 

Offline MiDi

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Re: 4-wire short - DIY
« Reply #10 on: June 27, 2018, 08:40:47 am »
I decided to make another batch, but it would take a couple of weeks...

They are not suitable for all devices: The plugs are a bit shorter than standard bananas and the pullout needs some space at the bottom.

If the jacks are even with the front panel or the inner contact of the jacks are heavy recessed, they are not suitable for that device!
 

Offline cowasaki

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Re: 4-wire short - DIY
« Reply #11 on: June 27, 2018, 08:52:39 am »
I decided to make another batch, but it would take a couple of weeks...

They are not suitable for all devices: The plugs are a bit shorter than standard bananas and the pullout needs some space at the bottom.

If the jacks are even with the front panel or the inner contact of the jacks are heavy recessed, they are not suitable for that device!

I have a Keithley 2100 and a couple of PM2525s I can't actually recall if either of them are so will check tomorrow.
 

Offline MiDi

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Re: 4-wire short - DIY
« Reply #12 on: June 27, 2018, 03:16:09 pm »

I have a Keithley 2100 and a couple of PM2525s I can't actually recall if either of them are so will check tomorrow.

Keithley 2100 should be fine.
PM2525 I saw do not have 4 terminals and even if they would, they are of type "flush mount" and not suitable.

Not suitable:
Keysight 34470A

Borderline:
Keithley DMM7510
« Last Edit: June 27, 2018, 03:38:43 pm by MiDi »
 

Offline cowasaki

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Re: 4-wire short - DIY
« Reply #13 on: June 27, 2018, 03:19:24 pm »

I have a Keithley 2100 and a couple of PM2525s I can't actually recall if either of them are so will check tomorrow.

Keithley 2100 should be fine.
PM2525 I saw do not have 4 terminals and even if they would, they are of type "flush mount" and not suitable.

I was answering whilst watching TV and didn't really give it a thought.  The PM2525 has 3 terminals plus the DIN socket :)  You'd think I would remember having 2 of them although they get much less use now!!  This would really have been for the Keithley though anyway.
 

Offline MiDi

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New batch
« Reply #14 on: July 18, 2018, 07:25:40 am »
Started the new batch today.
It will take a couple of days to finish.
I give an update, when they are ready for shipping.
« Last Edit: July 19, 2018, 07:03:49 pm by MiDi »
 

Offline MiDi

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New batch awailable
« Reply #15 on: July 19, 2018, 07:54:01 pm »
New batch is internationally awailable on ebay germany - just search for "4-wire short"!
« Last Edit: July 20, 2018, 02:12:54 am by MiDi »
 

Offline Navarro

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Re: 4-wire short - DIY
« Reply #16 on: July 20, 2018, 01:42:51 am »
Are they suitable for the 34401A, MiDi?
PY1CX
34401A - DSOX2002A - 66332A
 

Offline MiDi

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Re: 4-wire short - DIY
« Reply #17 on: July 20, 2018, 01:54:18 am »
Are they suitable for the 34401A, MiDi?

Sorry, they are not suitable for the 344xxA-Series, they are to short to fit accurately into the heavily recessed jacks.
 


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