Author Topic: Agilent 3458A Repair  (Read 2876 times)

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Offline IanJ

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Re: Agilent 3458A Repair
« Reply #25 on: July 12, 2018, 03:51:30 pm »
Ian. one thing you should do is run the full autocal, if you have not done so.

Well, I have tried ACAL DCV a few times and it fails at start.

Ian.
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Offline zucca

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Re: Agilent 3458A Repair
« Reply #26 on: July 12, 2018, 06:12:59 pm »
Can't know what you don't love. St. Augustine
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Offline IanJ

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Re: Agilent 3458A Repair
« Reply #27 on: July 16, 2018, 08:34:55 pm »
Hi all,

UPDATE:

I contacted Keysight.

Date of manufacture:- July 2009.

They say A3 boards are for internal repairs only and the 3458A needs sent to them. I am disputing this as their website claims it's orderable and offers trade-in discount...…...As far as I am aware some of you guys have purchased A3 boards from them....correct?

Ian.
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Offline quarks

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Re: Agilent 3458A Repair
« Reply #28 on: July 18, 2018, 12:42:00 am »
Hello Ian,

I have bought an A3 board from Keysight in Boeblingen Germany a few years ago.
I do not know if they still sell any, but you can try.

good luck

 

Offline IanJ

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Re: Agilent 3458A Repair
« Reply #29 on: July 18, 2018, 02:51:53 am »
Hi all,

Got a reply from Keysight UK and they say they are now checking with the parts team in the US to see if I am able to order the A3.

Ian.

UPDATE (18/7/18):
Got quote from Keysight UK......good to go regarding ordering the A3. It's described as a "Tested Fresh Board".

« Last Edit: July 19, 2018, 01:09:34 am by IanJ »
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Offline retroware

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Re: Agilent 3458A Repair
« Reply #30 on: July 21, 2018, 02:32:19 am »
As I mentioned in a previous post, I recently went through the A3 exchange process with Keysight.  All in all it was a very pleasant transaction (other than the price!). My old A3 was quite drifty as measured by CAL72.  The new unit is very stable. It has moved a total .015ppm over a two week period.

I hope your experience ends up being similar.
 
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Offline IanJ

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Re: Agilent 3458A Repair
« Reply #31 on: September 15, 2018, 12:41:31 am »
Hi all,

Finally got around to an A3 exchange with Keysight.
Photo below old & new board side by side......and it powered up.

Have fitted the new board and powered up........my errors & lockups have gone, so now requires a bit of testing & CAL. Will leave it powered for a few days before attempting.
PS. ERR shown is because it wants an ACAL........which it's doing. Hopefully all will be fine. It's fine, all ERRs cleared.
I managed to get a bottom shield from Adrian, including the small A3 board cover....so all is there now physically.

Never thought I'd have one 3458A let alone two!, great fun!.......but the plan I guess is to sell this one at some point.

Ian.

« Last Edit: September 15, 2018, 01:21:18 am by IanJ »
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Offline TiN

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Re: Agilent 3458A Repair
« Reply #32 on: September 15, 2018, 01:34:18 am »
Selling 3458 is a volt-nut capital crime. Those wrong buttons bothers me too  ;) :)
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Offline IanJ

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Re: Agilent 3458A Repair
« Reply #33 on: September 15, 2018, 01:39:47 am »
Hi all,

Forgot to say......the filter gauze deteriorated/fell apart so am sourcing some new material to cut to size . Does anyone know what mesh size is fitted normally. I am thinking 50 or 100 mesh.

Ian.
Ian Johnston
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Offline IanJ

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Re: Agilent 3458A Repair
« Reply #34 on: September 15, 2018, 01:52:17 am »
Those wrong buttons bothers me too

The funny thing is it's not as if it's just the rods that are the wrong size, the aperture is sized accordingly within the front panel itself.......which leaves me wondering either they were changed out at some point from some other model.......or they did indeed make a batch this size.

Can just see in the attached piccy.

Ian.

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Offline TiN

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Re: Agilent 3458A Repair
« Reply #35 on: September 15, 2018, 02:09:17 am »
Button cap is wrong. It's a separate part.
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Offline IanJ

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Re: Agilent 3458A Repair
« Reply #36 on: September 15, 2018, 11:44:52 pm »
Hi all,

Did a bit more work this afternoon, piccy attached, repaired 3458A at the top.

I have run a quick DCV CAL 0 and CAL 10.00000 using a PDVS2 as source and so far so good. Got caught out for a few mims when CAL 0 was failing, turns out I hadn't disabled the secure jumper on the cpu board.
The new Snaphat batteries I fitted are working fine.......but I did notice (per M.J.Lorton's 3458A) that the new batteries I purchased were date stamped older than the ones fitted.....but changed them out anyways.

The display is slightly brighter on the new one also, my original is an older Feb. 2000 machine after all.

PS. If I can find some button caps........I'll change them  ;)

PPS. I now have an air-con unit in my workshop so the temperature is pretty stable day & night......so will leave both the 3458A's running 24/7 for comparison.

Ian.
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Offline TiN

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Re: Agilent 3458A Repair
« Reply #37 on: September 16, 2018, 12:13:49 am »
I thought you had original 3458 traceable calibrated at lab?  :-//
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Offline dl1640

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Re: Agilent 3458A Repair
« Reply #38 on: September 16, 2018, 10:16:30 am »
The original machine is from year 2000 but with Keysight panel

通过我的 PRA-AL00 上的 Tapatalk发言

 

Offline IanJ

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Re: Agilent 3458A Repair
« Reply #39 on: September 16, 2018, 07:13:49 pm »
The original machine is from year 2000 but with Keysight panel

通过我的 PRA-AL00 上的 Tapatalk发言

I replaced it with a new front panel.......I still have the original HP one (very old looking).

Ian.
Ian Johnston
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