BNC socket fatigue

[Coordonnée_chromatique]

Hello, could anyone say to me why the connector manufactuers don't use nickel silver alloys for these kind of connector ?

[tooki]

I have since tried connecting the pinless un used body of a Staubli BNC plug to the Jaycar BNC line socket and it will not mate without applying more force than is reasonable.
 I took a closer look with some magnification and it seems the Jaycar line socket dielectric is too large in diameter (it mates ok with a Jaycar BNC plug).

Maybe your Jaycar connectors are 75 ohm BNC (that is, the ones for video), rather than the 50 ohm BNC used for test gear?

Edit: nah, I just double checked and 75 ohm BNC has an absence of dielectric, so that can’t be the issue.

I attached the PDF which includes a dimension spec for the BNC in metric and imperial. For some reason I struggled to get a google result that wasn't in inches and maybe its useful to someone else.

Probably because BNC, like most of the common RF connectors, were designed by or for the US military, and standardized in DOD military specs. So their canonical specifications are in inches.

[targit]

A "new" development, I have been using flying leads made with high quality parts from RS and everything was fine until yesterday when channel 1 suddenly became unusable. I stripped it down again and found the de-soldering problem has been solved for me courtesy of all 4 chassis pins being detached from the socket body.
So now I it looks like I need to try and source an OEM replacement. Waiting with fingers crossed for Micsig sales to reply to email

[coppercone2]

you can drill it with a small drill press and insert brass pins to repair it if they don't have it

[TERRA Operative]

All these troubles with the center contacts and now all four mounting pins are snapped?

I'm blaming an excessive amount of force by the user. 

[targit]

Hi, I am not claiming that this has just failed on its own, the scope is in use in less than ideal conditions in automotive workshops, frequently gets balanced in engine bays and other precarious places. It has done well to last this long. There are specialist (Snapon I think) scopes with 4mm banana jack inputs which would be much more robust and suited to the type of signals I am usually dealing with (sub 1Mhz) but they are also stupidly expensive with rubbish user interfaces.
I'm considering the Micsig ATO1004 as a replacement as its on sale just now and 4 channels would be nice, but would rather get this one going again.

[tooki]

Or just give up on the BNC and solder your flying lead directly to the PCB. Just make sure you provide REALLY good strain relief somehow.

[alm]

Tooki's idea of adding your own pigtails and making a more solid strain relief (maybe something 3D printed that you can mount to the case?) so the strain is not on the solder joints sounds like a good solution to me. Not ideal for signal integrity, but it doesn't exactly sound like you're pushing the bandwidth.

[tooki]

Tooki's idea of adding your own pigtails and making a more solid strain relief (maybe something 3D printed that you can mount to the case?) so the strain is not on the solder joints sounds like a good solution to me. Not ideal for signal integrity, but it doesn't exactly sound like you're pushing the bandwidth.

OP is already using pigtails (just connected to the BNC jacks rather than soldered to the board) so I doubt integrity would be any worse than what they’re using now!

[targit]

OK, So I took the plunge and de-soldered the AUX OUT socket by heating up the socket with hot air and then using Chip Quik and a de-solder station. Next, thoroughly flooded the socket pins with fresh solder and cleaned them up to remove all the traces I could of the Chip Quik and then soldered the good BNC to the input 1 position. Just for good measure I then strapped/soldered the damaged old socket onto the PCB with copper wire in the AUX OUT position - I never use this so I was just filling the hole in the back panel.
Everything now working properly  just need to take more care of the inputs in the future.