Author Topic: [Volt-nut] "HULK" Fluke 5720 calibrator rig build out of random broken boards.  (Read 40682 times)

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Offline e61_phil

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #25 on: May 25, 2018, 12:51:13 pm »
@Tin: Is it possible to run some linearity tests? Fluke 5700A against 3458A BOTH in fixed Range from 0V to 10V? That would be very interesting.
 

Offline TiNTopic starter

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #26 on: June 04, 2018, 11:35:47 am »
Got tinted blue acrylic lens today for front panel mods. Looking much better with it.  :-DD
Blue tint gives interesting looks too. Vendor did not have gray lens in stock.



Now need to dremel some metal work to make 5700 display board fit the 5500A FP frame.
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Offline Haasje93

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #27 on: June 04, 2018, 04:16:36 pm »
NICE!!! :-+
 

Offline GerryBags

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #28 on: June 04, 2018, 05:02:38 pm »
Looks like better than a bought one!
 

Online bingo600

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #29 on: June 04, 2018, 05:04:51 pm »
Damm TiN you are NUT's - Not just Volt-nut's   :clap:

Amazing assembly, and i'd say 99% impossible to get those boards for human payable prices in EU'land

/Bingo
 

Offline TiNTopic starter

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #30 on: June 09, 2018, 01:53:06 pm »
Repaired today my A14 (High-voltage/High-current assembly).

Culprit part was $24 opamp:



Board overview:



There is I/O and relays control on the right side, A=-100 amp, and other analog circuitry. This board, together with A15 used to generate 1KV DC/AC and 2.2A ranges in calibrator. Big metal thing on the right - is custom transformer made by HIREL SYSTEMS for Fluke (P/N 775288). Transformer was checked to be OK, so that was a "phew" moment.

Original issue was that high-voltage ACV was working, but 2.2A and DCV not, tripping output to standby and failing self-test like:

A15 (HV +DC High voltage output fault) error 3111
A15 (HV +DC/Amp Ref/Error amplitude fault) error 3112
A15 (HV +DC preamplifier fault) error 3109
A15 (HV +DC series pass & current fault) error 3110



Board received damaged, thanks to "great" shipping  :-- But nothing too hard to fix.



Also because transformer is not tightly mounted to board (it supposed to be fixed by inguard chassis frame, not PCB), it made a dent in board.



But inner traces still ok, so I'll just let that be.

After some troubleshooting and opamp replacement, she is fully functional now. :)

Now I only need to fix my A18, which had one of 220K 3W carbon-composite resistors go boo to 75 ohms and cooked PCB under it.  :scared:

My strategy is typical - mill out the carbonized FR4 material, restore connections with copper jumpers and put new components (including replacement for all rest carbon comp mines)



Isolating stuff on this area of the board is bit important, because this is +/-250V supply regulator for MFC's PA.



Schematics of affected area with evil resistors marked out:



To be continued...
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Offline ManateeMafia

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #31 on: June 09, 2018, 02:03:25 pm »
Looks familiar. Those 220k resistors should be inspected annually or replaced based on parts used in the 5700A/20A II.
 

Offline Johnerwin

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #32 on: July 02, 2018, 05:08:01 pm »
Hi Tin, what made the error “Guard crossing protocol failed to start”. I have the same issue with my fluke 5700.

 

Offline TiNTopic starter

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #33 on: July 02, 2018, 07:33:14 pm »
That error happened when I power on only outguard boards. Essentially it means A20 cannot talk to A17 over the fiber.

If all power is OK, then maybe A17 died. I have repaired one recently.
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Offline Johnerwin

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #34 on: July 03, 2018, 02:18:52 am »
I replaced the A17 with another good A17 board but i still get the same message. Could it be the a20?
 

Offline TiNTopic starter

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #35 on: July 03, 2018, 02:21:45 am »
Did you check power on both in guard and outguard domains? Check fiber cable too.
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Offline Johnerwin

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #36 on: July 03, 2018, 02:34:27 am »
I will check it later, I am just waiting for another 5700 I borrowed from a friend. I will see later which one is the culprit. Thanks Tin
 

Offline TiNTopic starter

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #37 on: July 03, 2018, 04:13:52 am »
I'd be very careful with somebody else's 5700, as if one of your PSU boards cooked (old A18 can go bad easily due to CC resistors in PA supply section), then you can very much kill your friends 5700A. Also beware high voltages present in calibrator, even when output is not programmed for high voltage/operate mode.  :-BROKE
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Offline Johnerwin

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #38 on: July 03, 2018, 04:52:47 pm »
Thanks for the advice Tin, now its already working. Found out that the optical connector needs soldering. Now its running good and passed all self test. Btw I got an R&S smiq03 maybe you are intersted in. I will check for the error messages so you can have another project. Thats for free because of the free advice.
 

Offline TiNTopic starter

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #39 on: July 13, 2018, 05:50:06 pm »
I should rename this thread from Zombie to Hulk Edition.

Why? This is the case when few photos work better than hundred books...  :wtf:

Key component - chassis, has arrived today.  :-DD

Just few minor dents and scratches, no worries..  :-//

           

Few, they say?  ???

           

5720A.. it was...  :scared:

           

           

Of course I bought this case without any PCB. Can't afford it if you want to ask the price..  :popcorn:

           

           

Right side :D

           

There are flatness "issue".

     

Low Thermal binding post is gold-plated CuTe for reference. If I file 0.3mm off it for notch, it should fit in just fine.

           

Film sheet that originally stick between VFD glass and front panel plastic is conductive. It's some sort of (ITO?) RFI/EMI shield mylar, to reduce radiated crap from high-voltage VFD spitting outside of calibrator.

           

Put 5700A VFD board in...

           

Like a bought one, eh?

           

Some quick tests with reassembled panel

           

"She will be alright"...

           

More photos at xDevs.com post.
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Online Dr. Frank

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #40 on: July 13, 2018, 06:12:14 pm »
Unbelievable, what kind of crap you can buy.
Anyhow, even if the proceeding steps are getting smaller and smaller, there's now light at the end of this long tunnel.

"First Light" expected in a few weeks, or so?

Frank
 

Online Echo88

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #41 on: July 13, 2018, 07:24:49 pm »
It physically hurts to see such a device tormented so brutally. But nurse TiN is already at work and caresses the patient.  :popcorn:
 

Offline texaspyro

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #42 on: July 14, 2018, 12:31:00 am »
It physically hurts to see such a device tormented so brutally. But nurse TiN is already at work and caresses the patient.  :popcorn:

While wearing his oh, so fetching "naughty nurse" uniform!   >:D

TIN ain't afraid of no crap!  No how!  No way!  It's all good to him!
 

Offline Towger

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #43 on: July 14, 2018, 05:03:39 am »
That case must have come the EEVblog's favourite eBay seller in Israel!
 
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Offline bd139

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #44 on: July 14, 2018, 06:22:21 am »
Lurking on this thread. One of my favourite on here at the moment :)

That Israeli seller is “interesting”. Did a bomb land on his warehouse? So much good stuff battered.
 
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Offline SeanB

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #45 on: July 14, 2018, 08:29:16 am »
Lurking on this thread. One of my favourite on here at the moment :)

That Israeli seller is “interesting”. Did a bomb land on his warehouse? So much good stuff battered.

More likely he is digging through the dump bins of a military warehouse, and grabbing the stuff they ran over with the bulldozer that day.
 

Offline TiNTopic starter

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #46 on: July 14, 2018, 07:26:20 pm »
Perhaps somebody who is familiar with mechanical field can help me a little?

Since this wonderful shaped chassis came without top inguard and outguard shield covers, I'm going to design and get manufactured suitable replacements.

CAD drawing with photo-texture over:



Item I need help with is this:



It is a press-fit "washer" which allow bolt head to stay flush to the surface of the shield.



It does not have a thread. Press-fit diameter is 3/8". What is the proper name for it, so I can google it and source from some hardware store/supplier? I tried to google "press-fit nut, washer, blind screw press-fit" etc, but all I get are standoffs or threaded inserts.

Here is photo of these in the original cover:


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Offline plesa

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #47 on: July 14, 2018, 07:43:18 pm »
Try to look for knurl inserts
 

Online 2N3055

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #48 on: July 14, 2018, 10:23:43 pm »
Insert or rivet  nuts..
« Last Edit: July 14, 2018, 10:28:37 pm by 2N3055 »
 

Offline ManateeMafia

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Re: [Volt-nut] Zombie F5720A calibrator build out of random boards.
« Reply #49 on: July 14, 2018, 11:39:48 pm »
I think the fasteners used by Fluke were made for captive screws but Fluke inserts the screw in the other direction.

They would be similar to this https://bit.ly/2NSuWR9
The ones in the link are probably too long but it might help him narrow down his search.
 


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