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SPD3303X-E another question regarding binding posts.
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rf-loop:
If the original genuine Hirschmann BUELA 30K is indeed too loose, there is something seriously wrong with the binding post. BUELA 30K (also 20K) is just the right plug for these connectors.
Note: There are also many more or even total shit " look-alike " copies of "Hirschmann BUELA 30K". (for example, the spring force may be very weak due to wrong material and the spring prongs are too soft, which means that they lose spring force very quickly in use.)

Could you measure the inside diameter of the hole in the power supply connector - exactly?
For some reason I value real raw data more than opinions and feels.

We know what it should be. As far as I understand, there are also defined tolerances for it. After all, Hirschmann is the original developer of that whole banana plug from the beginning of the last century. If these are not ok for these binding posts - then binding post are wrong.
It's really unbelievable that this could be an issue in 2022.
Example: CalTest gives the dimensions of the internal contact hole of the banana plug: Ø .157 ± .002 (Ø 4 mm ± .05 mm)
I have somewhere old design drawing about these Siglent binding posts but I do not remember dimensions and tolerances. And can not find this image now.

Electroplated:
Hi rf-loop,

I've used digital needle calipers that go to the metal inserts I get these measurements, best I could do and should have done this sooner ! ( measurement method: zero calipers, insert across plastic outer casing, take a measurement, rotate calipers 90 degrees, take measurements)

reading  left to right:

Neg ch1   4.90 mm
Pos ch1   4.70mm
Gnd         4.77mm
Neg ch2  4.82mm
Pos ch2  4.86mm
Neg ch3 4.85mm
Pos ch3  4.83mm

Inserting the calipers into the metal receptacle I get:

reading  left to right:

Neg ch1   4.48 mm
Pos ch1   4.42mm
Gnd         4.37mm
Neg ch2  4.47mm
Pos ch2  4.43mm
Neg ch3 4.47mm
Pos ch3  4.43mm

As a comparison:

Staubli 23.0330-22 red binging post, new unused for a test, inside metal receptacle : 3.99mm
Second measurement resulted in 4.08mm so there is some error in my measurements but not much compared to its RS data sheet.

Still not heard back from Telonic or Siglent yet.
Electroplated:

--- Quote from: tautech on August 08, 2022, 10:37:07 am ---I'm very interested in the outcome as we get a new shipment of these PSU's in the next week or 2 after not having had any for a while and if they have loose banana plug sockets.......I won't be pleased.

--- End quote ---

Hopefully mines just a oddball, it can happen so lets see before those negative waves begin to cause some gloom  ;D

Not heard anything back yet, probably a bit too soon to expect a response, Tommorow I wont be here till tomorrow night, if at all, hospital job, the bone pullers want my remaining few teef so I can fitted with someone else's so I get my Mr Ed look back, may have to change my forum name to something suitable, like toothless wonder or ol stumpy....

Rest assured, once I hear something I will let you know but I bet I have a Friday job SPD3303X-E, unless they had issues with sourcing parts due to the state of the world and dug out that big box of posts they had to change.......and I got one  ;D

--
mawyatt:
Couple things I do like about these terminals are they seem to be beefy and really like the colored tips.

The colored tips make it very easy to see from anywhere at any angle, even with plugs engaged, while the GPP-4323 only has thin colored washers behind the the smaller terminals. This makes it very difficult to see from anywhere, we are always having to take multiple "looks" just to be sure of what terminal is what, however the plug fits securely with any plug!!

Best,
Electroplated:
I think the best thing is the spacing, that little bit more so fat fingers can tighten the terminals, I sometimes struggle on the standard 19cm spacing, more so if the knurling / grip isn't so good or like me a bit of arthritis affects the fingers, I would rather have the extra distance, something I have never really thought about till I got this bench supply.

Your point about the big colour rings is a good one, yes they much easier to see, I have a old power supply that lost its lettering, the posts have a thin line of color around the end, you cant see it if a plugs in place unless you pull it back a little, its a pain in the backside doing that, luckily I don't use it that often, its mostly used to drive a 12v water pump that's used to rapidly empty water butts and a small fountain, takes too long for gravity to do it and I would rather do something else than babysit buckets, unless they are full of a decent home brew  ;D

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