Author Topic: EEVblog #755 - Fluke PM2812 PSU Ebay Score  (Read 18456 times)

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Offline orion242

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #25 on: June 20, 2015, 10:35:26 am »
Couch feet, too funny!

For the cover, maybe find a HVAC sheet metal shop.  They might bend up something reasonable.  Local metal fab around here would build a power coated AL single for ~$500 if I had to guess.  Not a great option unless your think the resale value would justify. 
 

Offline EEVblog

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #26 on: June 20, 2015, 11:08:35 am »
Dave, or somebody else, how do you keep finding these deals? Do you just search for random electronic related searchterms? Do you complete some kind of list, eg first search for scopes, than for sources, ... Or is there some kind of ebay sub catogory with most of these things in it? Cause I really wanna get in on some of this action!

The easiest way is to simply search the category you are after and select "For parts or not woking", or you can search all categories in Electrical if you want.
I also have a list of (some of the more obscure) brands that I regularly search for just to see if something pops up.
I also have targeted email alerts for specific things I have looking for. You could do this for Non-working stuff too if you were keen.
 

Offline EEVblog

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #27 on: June 20, 2015, 11:09:40 am »
Early on in the video I noticed that daisy chain cable wasn't connected to the board. I also noticed that the 4 screw terminal block on the rear of the chassis for output 2 is missing two screws. Comparing it to channel 1 it is missing the shorting wire between -S and -V. You may be able to fix the channel 2 stability issue by replacing the two missing screws and adding a bit of wire to short the two terminals.

It's not that, I put in proper screws you didn't see on camera.
 

Offline Alex Eisenhut

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #28 on: June 20, 2015, 11:45:08 am »
Dave, or somebody else, how do you keep finding these deals? Do you just search for random electronic related searchterms? Do you complete some kind of list, eg first search for scopes, than for sources, ... Or is there some kind of ebay sub catogory with most of these things in it? Cause I really wanna get in on some of this action!

I am also at a loss where people find these deals.  I did see a condition subcategory of Faulty - Not Working on ebay.com.  Cant find it now and never found it on ebay.com.AU.  I believe it is an option when selling something so you should be able to filter on it as a buyer.

eBay has email notifications of searches you want to "follow".
 

Offline Tothwolf

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #29 on: June 20, 2015, 04:06:48 pm »
The keywords should be "parts only" or "repair only"

I guess you can combine them, like "power supply parts repair"

(fluke,tektronix,tek,hp,hewlett,hewlet,packard,agilent,keysight) (power-supply,powersupply,psu) (part,parts,repair,faulty,asis,as-is) -(atx,ac-adapter,charger,deskjet,printer,proliant,compaq,001)
 

Online Kleinstein

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #30 on: June 21, 2015, 12:48:51 am »
The 19" size is pretty standard. So there is a chance that the cover from an other instrument that's beyond repair may fit. Other wise I would stick to a metal cover because of EMC and continued protection against fire.

The schematics shows a funny detail on how read back of voltage and current is done: it's not using a normal ADC, but the DAC and 2 comparators. Really ancient way of doing things. So don't expect a high resolution / accuracy on the readings.
 

Offline k2teknik

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #31 on: June 21, 2015, 02:30:13 am »
The schematics shows a funny detail on how read back of voltage and current is done: it's not using a normal ADC, but the DAC and 2 comparators. Really ancient way of doing things. So don't expect a high resolution / accuracy on the readings.
Why not? Successive approximation ADC are not bad, they may be slow compare to the way things works today.
It is just a system PSU does it had to be fast for general purpose?
 

Offline free_electron

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #32 on: June 21, 2015, 03:19:59 am »
These supplies truly are tanks. Virtually indetructable.
I still have one left. I gave a few away and sold a bunch. I had like 8 or 9 of em.

I have thefull schematic somewhere on paper.
Professional Electron Wrangler.
Any comments, or points of view expressed, are my own and not endorsed , induced or compensated by my employer(s).
 

Offline EvilGeniusSkis

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #33 on: June 21, 2015, 05:31:06 am »
maybe we should all mail Dave some couch feet for the mail bag. >:D
 

Online Vgkid

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #34 on: June 21, 2015, 05:54:34 am »
Thanks for the video. Funny enough the ribbon cable was the first thing I noticed.
If you own any North Hills Electronics gear, message me. L&N Fan
 

Offline ornea

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #35 on: June 21, 2015, 10:01:18 pm »
Happy Birthday.
 

Offline Arie

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #36 on: May 31, 2017, 05:26:32 am »
Dear reader,
I am also looking for a diagram from the power module from a PM2812. Did you find a diagram?
Best regards,
Arie
 

Offline Arie

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #37 on: May 31, 2017, 05:32:16 am »
Dear reader,
I am also looking for a diagram from the power module from a PM2812. Did you find a diagram?
Best regards,
Arie
 

Offline ober

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #38 on: May 05, 2018, 02:01:04 am »
So was the mystery of the X4106/X4102 swap for the blue wire plus the separate 110/220 jumper ever solved?
My PM2811s have both the black jumper and a free spade near the blue wire...
 

Offline ober

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Re: EEVblog #755 - Fluke PM2812 PSU Ebay Score
« Reply #39 on: May 24, 2018, 07:09:55 am »
The mystery has since been cleared up in a different thread:
https://www.eevblog.com/forum/reviews/phillipsfluke-pm2811-power-source/

So you move both the black wire on the lug marked 110 V to the 220 V
lug and the blue wire as marked in section 3.1.5 of the service manual
(from X4106 to X4102).

I can confirm that this works for moving US-spec PM2811 supplies to
230 V.

Don't forget to change the fuses (although the supply of course will
work on 230 V with the larger fuses needed for 110 V, just
dangerously).  Yes, there are a total of two, same-spec fuses that
need to be swapped...  The rating is dependent on the number of
channels (PM2811: 1.25 A, PM 2813: 3 A, slow-blow).

As the original fans in my supplies were audibly lamenting their age,
I also put in new ones: NMB Technologies Corporation
2410SB-05W-B20-B00 24 V fans (one needed for PM2811, three for
PM2813), using Molex 90156-0142 plugs and 90119-2109 crimp inserts to
cable them up.
 


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