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| SPD3303X-E another question regarding binding posts. |
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| Electroplated:
Hi, This is regarding my brand spanking new SPD3303X-E that I took deliver of yesterday. A bit of a ramble to start with, My old home built power supply finally gave up the will to live due to a transformer fault, open primary, it gave stellar service over the years, 0-30V 0-5A, separate 5 and 12V outputs and a 10v AC at 5A. So rather than rewind a new transformer by hand again ( large toroidal and lots of big calculations ) I decided to search for a new one and decided on the SPD3303X-E after reading everything I found about it. I knew about the binding post problems with early versions and that Siglent have addressed the issue along with the overhearing bridge rec and thought if its anything like the SPD1305X I have then the binding posts wont be an issue, besides the fact the positive and negative terminals are reversed on both models from the same manufacture ( really ? ) however, none of my banana ended cables fit snug into the SPD3303X-E, the same ones fit snug into every piece of gear I have but on the SPD3303X-E, nope, to get a decent connection I have to use fork terminations or bare wire. My SPD3303X-E is REV3 with the most recent firmware, not sure what version the binding post issue was fixed, so am wondering if I got an older version ? all I can do is ask call Siglent and speak to them and see where we go from there. Its a nice supply, does what I need and most important, its fits on my space limited bench, we live in the UK in an old house and I was allowed to have a little bit of space in a spare room, I should have read the marriage license more carefully to see if there is actually a limitation on the maximum allowed hobby area ;D... its also very quiet. Besides the gripe about the binding posts not holding banana connectors ( ignoring the 20 mm spacing that I can work around by making new adapters ) the only other bug if it is a bug is the current limiting, it seems rather slow under 50mA, it does go in to current limit mode just as expected but under 50mA its rather slow to respond, under 30mA the warning bleep doesn't work, above 30mA and there's a warning bleep. Maybe Siglent should put a warning bleep on the binding posts to let you know the cables fell out ;) Anyway after that Sunday morning ramble, the short version, does anyone know what hardware versions had the binding post problem ? -- |
| tautech:
5 years ago binding post banana socket issues were resolved when another binding post was fitted however it never resolved users using old and outdated banana plugs. The list in this post has the perfect examples of this old stuff that should be reserved for instruments of yesteryear that don't prescribe to modern insulation clearances. https://www.eevblog.com/forum/testgear/siglent-spd3303x-e-binding-post-issues-solved/msg1445242/#msg1445242 So why would I say this ? The modern banana socket has conductive metals deeper in the socket and more insulation length near the opening for just one reason, safety for the user. Then you ask why, it's a LV PSU ? Well it is and it isn't, in Series mode these are 60V supplies and you would correctly say that's not exactly dangerous in any way which is true until you take advantage of another feature these units offer.....multiple units can be series'ed together for a max of 500V above mains earth ! Excuse me but in that case I'd prefer any metalwork in the banana sockets to be buried deep within and only reachable with modern quality banana plugs. |
| Electroplated:
Thanks for the reply tautech, Most of mine are either hirschmann or Staubli or Mueller, these are loose when plugged in, easy to wiggle about, they don't leave any exposed metal when pushed in but are loose, these are not cheap rubbish. Other ones, well some cheap junk that I don't use leave a collar exposed but we don't use those on power supplies, was just comparing junk to decent ones. There is a huge difference between the binding posts on the SPD3303X-E compared to those on the SPD1305X, besides the obvious differences and fit the SPD3303X-E binding posts do have some play in them against the front panel, the entire binding post assembly can move relative to the front panel, don't have this on anything else. I'm not going to buy a whole range of test leads in the hope a set will fit when I have a stash of quality ones that I never have issues with, now not sure where to return it or see if other posts can be supplied or fitted, its a shame but in its present state, its not really useable unless you use wires or forks to get a tight connection and that causes a lot more problems than it solves. -- -- |
| mawyatt:
Know what you mean regarding the terminals, we have 3 SDP3303. We just don't get a good "feeling" when inserting any banana plug, and they don't seem to engage as deeply as the other instruments. They actually appear more robust and beefier than the terminals on the GPP-4324 we have which are smaller, but work as expected with a deep firm grip. The electrical performance is quite good and a very good value. Even with the quirky user interface and even with the terminal issues these are our usual "GoTo" supplies when doing quick setups for the lab. We have all sorts of cables and plugs including the cheap rubbish types, we've found the ones with a long blade type contact rather than the spinning spindle type work better because they have a much longer contact area and will fully engage with the SDP terminals. Best, |
| AVGresponding:
I've an RS-Pro rebranded one, and the terminals are just fine with all my banana plugs, as far as I can see, both cheap and expensive. It has hardware version 3.0 |
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