Author Topic: Wires connected without banana to binding posts (Rigol DP832 power supply)  (Read 2282 times)

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Offline David Hess

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Re: Wires connected without banana to binding posts (Rigol DP832 power supply)
« Reply #25 on: November 06, 2024, 04:33:20 pm »
On my Korad power supply I took it apart so that I could re-orient all of the posts to have the post holes at a 45 degree angle. Was relatively easy to do. Makes getting wires in there quite a bit easier.

I will have to do that on mine.  I am in the process of refurbishing one PS503A and then I can swap them and do the other one.
 

Online RoGeorgeTopic starter

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Re: Wires connected without banana to binding posts (Rigol DP832 power supply)
« Reply #26 on: November 08, 2024, 02:21:49 pm »
Found a workaround!  :D

What bothered the most with the faulty binding posts:
- the hole was too far from base, thus tending to snip the wire
- the plastic edges were too high, such that the wire was not squeezed against the metal parts

At first I thought I might add an extra metal washer, and somehow solder the washer there.  Not really doable.  Then I've thought the washer can sit as well around the wire.  Then I've realized I can just tie a knot on the wire strands.  ;D
 
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Offline rwaters

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Re: Wires connected without banana to binding posts (Rigol DP832 power supply)
« Reply #27 on: November 08, 2024, 10:46:22 pm »
Google banana spade adapter. Amazon, Digikey etc etc. Really nice ones from Pomona P/N 2305
« Last Edit: November 08, 2024, 10:49:52 pm by rwaters »
 

Online coppercone2

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Re: Wires connected without banana to binding posts (Rigol DP832 power supply)
« Reply #28 on: November 09, 2024, 06:59:37 am »


« Last Edit: November 09, 2024, 07:01:28 am by coppercone2 »
 

Online coppercone2

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Re: Wires connected without banana to binding posts (Rigol DP832 power supply)
« Reply #29 on: November 09, 2024, 07:04:00 am »
you know why you should replace it? Because it sounds defective. I.e. it can crack and then slide into the power supply and blow it up


I had this tomfoolery on my current source i bought on ebay. A creative person thought he can fix it with JB weld and super glue. When I unplugged a banana connector the banana plug metal bit came out of the chassis , energized at 100VDC, almost shorting out to the chassis

If you see common stuff that has like a obvious defect, in a electronics lab, its wise to just assume its a bad idea to use it

Wanna bet its made with sub standard plastic, shady additives, not tempered properly/manufactured with poor temperature control, and other defects (I am not a plastics expert)

Slides right out like a trombone


This situation with shady connectors (that can result in loose metal in the chassis) is precisely how a low voltage DC supply can turn dangerous. Such a bad habit to have in the lab with mains connected equipment. Or large batteries.


Usually you should be happy about a major mechanical design flaw that you find on a part. Because it usually is hiding something else. Its like getting a friendly warning.
« Last Edit: November 09, 2024, 07:19:20 am by coppercone2 »
 

Offline watchmaker

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Re: Wires connected without banana to binding posts (Rigol DP832 power supply)
« Reply #30 on: November 09, 2024, 01:24:02 pm »
Whenever I see poor workmanship, I look further.  I learned this restoring watches where even a damaged screw raises my antenna.

If the binding post source let that kind of machining pass, what else did they accept?  We know they accepted a lousy design that ignored the washer under the knob and the lower shoulder set too deep.  What about the "unseeable".

Reminds me of the 70s/80s machine tools out of Taiwan. They were basically "Kits" the end user finished to their own standards.
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Dewey
 

Online RoGeorgeTopic starter

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Re: Wires connected without banana to binding posts (Rigol DP832 power supply)
« Reply #31 on: November 09, 2024, 02:41:19 pm »
There certainly are other hidden flaws in this model, to enumerate a few:
- a radiator too small in the first version (mine is already the version with a bigger radiator)
- faulty internal wiring of the GND between channels 2 and 3 (this is mostly noticeable at high current)
- the faulty twisting of force and sense wires
- binding posts out of tolerance
- noisy fan
maybe a couple of software bugs, too, to name only a few.

Though, given its price (~$600 new, in 2015), the fact that I never needed to use it at full power, and that it was possible to unlock the mV/mA resolution together with all the other SCPI and software features made it a decent power supply.

Here, in EU, the choice of second hand lab instruments is very limited when compared with what is available on ebay USA.

Online coppercone2

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Re: Wires connected without banana to binding posts (Rigol DP832 power supply)
« Reply #32 on: November 10, 2024, 04:25:49 am »
I took a picture so people take the warning seriously

there is a soldered wire hook banging almost into the chassis on the back of this



Sure age has something to do with this, but I noticed, cheap parts with flaws seem to age alot faster

and as I mentioned in the other thread, I had a plastic cap fall off a cartridge fuse panel mount slot, leaving a big mains wired contact on the back of the chassis.

I say, never hesitate to replace suspicious hardware if it has anything to do with the outside of the machine. If your ground is good the inside is not gonna do anything too bad. But anything that can get out side of that shield needs to be dealt with.
« Last Edit: November 10, 2024, 04:32:20 am by coppercone2 »
 
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