Products > Test Equipment
Wires connected without banana to binding posts (Rigol DP832 power supply)
passenger54321:
This reminds me of something very old ... my 1988 loudspeaker (attached).
As you can see, not a good drilling quality, sharp edges, cheap plastic cap and only finger-tightened and no base plate at all.
And it is holding the unsoldered strained cable securely since 20 years with daily shaking -- I am living close to a railway line.
And the strands look pretty complete so far. So what is different with the setup you are seeing?
Pointing out that soldering is not a good idea as it makes the copper inflexible - just screw the strands tightly.
-Ulrich
nctnico:
Agreed. For long term use, tinning a wire is the worst you can do. The solder will creep causing a poor contact and it causes a sharp transition from solid to stranded which is super prone to breaking.
David Hess:
--- Quote from: watchmaker on November 04, 2024, 01:24:38 pm ---That is one example of crappy machining. It is obvious the holes are drilled before turning to diameter given the material extending into the hole on the positive post. Not even followed up with a chamfering tool. Finish speaks for itself. My guess is threaded, drilled, wire post turned to OD, shoulder, threaded for panel nut and then cutoff. The clearnace between the nut and the wire post (along with the turning marks) looks like the CNC registration for the wirepost changed; swarf caught between bit and work?
--- End quote ---
I took a close up photo of the binding posts (1) on my Tektronix PS503A power supply. The crosswise holes are close to flush with the bottom electrode.
(1) Made by The Superior Electric Company, Bristol, Connecticut.
--- Quote from: nctnico on November 05, 2024, 01:20:48 pm ---Agreed. For long term use, tinning a wire is the worst you can do. The solder will creep causing a poor contact and it causes a sharp transition from solid to stranded which is super prone to breaking.
--- End quote ---
I always tin stranded wire and you can see it in the photo below. If the tin creeps up under the insulation, then it can cause a stress point which eventually breaks however this is not a problem in stationary applications. They make special heat sinking pliers which will prevent the solder from wicking but I have never used them.
blackdog:
Hi,
Here are some banana binding posts from different brands.
I have added some comments to the photo, the two on the right side are of poor quality.
These cut the wire in two if you tighten the binding post too hard.
Kind regards,
Bram
Russ_A:
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.
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