I dont want to spend another minute thinking about it or try to argue about it.
ust a note of encouragement. Like you, I have a few Siglent bits of kit - A scope, the SVA3021X (started life as the SSA model), a SDM3055M and a power supply. All from Telonic.
In all cases, happy as larryapart from the Bench DMM. That was a bit of a saga - I bought the 3045X then sent it back because of the relay design fault in order to exchange for a 3055 (all mentioned elsewhere) which when it arrived had a marginal kind of fault - one of the 4mm sockets was a bit rough and the probes didn't feel quite right when pushing into that one. All of this kit cost much hard earned cash of course and although I got a gentle comment back saying that the probes went in ok and there wasn't much wrong, as far as I was concerned it wasn't a £10 meter from Aliexpress, and I expected better. These instruments will last me a long time (and I will be buying more stuff from that supplier) and I like to feel good about this kind of purchase, not feel a pang of regret every time I switch it on. So to their credit, the supplier sent me a new 3055 and now all is well.
If your VNA isn't right I am sure you are doing the right thing in rejecting it whether you decide to get another one or not. I am sure Telonic will do the right thing (do let us know either way - its good to reward good businesses and personal recommendations on these forums do help them I am sure). Eventually you will have the kit that you want and all the hassles of backwards and forwards / phone calls, emails and videos will be just a memory !).
Regards
Eloso
p.s. if you didn't buy it as a commercial customer, then don't forget there are distance selling regulations in the UK that allow you to return goods within a certain time period without actually needing to prove them faulty. I can't remember the exact laws now - they changed a little while back but a quick google will come up with it. I am sure Telonic will be helpful though in any case.
I think your N-type to SMA adapter that you are using on the SVA is worn out.
I have the same issues with the SVA1032.
The smith chart is very noisy and short/load/open are not described as points in the log smith chart view.
I use a professional calibration kit.
Another thing, when i want to specify my cal-kit under user cal. I cannot enter the specific details of the load ( it is grayed out as being exactly 50 ohm, which is not ). All other can be specified.
Does anyone has a clue?
Evert
Also, in this video at the 2 minute mark, you see how the load temporarily made contact then dropped out again when you were attaching it? There you go right there, shot. You essentially did the load calibration with an openGET NEW ADAPTERS!!!!!
Just entertain me and try a different adapter, what do you have to lose?
or a bad connection, yes, that is normal. With the tech returning it to you stating that it was fine, with the obvious bad connection in your video, and with me showing how to replicate your results by simulating a bad connection, and you still think that $1 connector is good... I have no further comment either ~ except one. I'm sorry to hear you had such trouble and I hope that you eventually find a good VNA that works for you.
If it like a patient told his doctor he has persistent headache on and off randomly, it could be a migraine, tension headache, gluacoma, sinusitis, Covid, brain tumour....
I was suggesting trying a different adapter, you opted for the transplant...
@regenfreak,
You did the only sensible thing you could have done in this circumstance. @antenna is right in a way but he's forgetting the other ten SMA connections and their five patch cables inside the SVA as pictured here:
https://www.eevblog.com/forum/testgear/siglent-ssa3000x-spectrum-analyzers/msg3088340/#msg3088340
When I saw your plots, it put me in mind of techneut's experience after cross-flashing his SSA to an SVA, hence my guessing from the symptoms you'd described that the fault was very likely one of these internal connections (a loose or damaged connector or faulty patch cable).
Regardless of the actual cause, the problem was obviously a fault within the SVA itself (the black screen events were enough cause in themselves to justify a return).
Telonic, when convinced that you have reasonable cause to reject the goods as faulty, will respond to such requests without undue delay, even when it means they have to bear the cost of collect and return. TBH, I was wondering just when you were going to request a return with full refund, hence my "vote of thanks" when you finally did so.
That could mean we could upgrade the new SVA1015 to higher BW...
The most recent Data Sheet (DS0701X_E05B) for the SVA1000 series specifies that the SVA1015X now has the same VNA and Tracking Generator specifications as the SVA1032X and the SVA1075X, i.e. 100KHz low frequency limit. A query to Siglent engineering responded that the DS0701X_E05B data sheet is correct.
Can anyone confirm from your SVA1015X that these new limits are actually correct? These are key parameters for a buying decision.
Thanks!
Don't be so hasty as we need check this out first.
Yes datasheet says VNA stimulus now = higher BW models but there are also other error in the datasheet in spec for all models.
Don't be so hasty as we need check this out first.
Yes datasheet says VNA stimulus now = higher BW models but there are also other error in the datasheet in spec for all models.
No hastiness here, just thinking out loud.
Nonetheless, I remember who has indicated in the past the low freq. distinction as a sign that the HW should be different.
Don't be so hasty as we need check this out first.
Yes datasheet says VNA stimulus now = higher BW models but there are also other error in the datasheet in spec for all models.
No hastiness here, just thinking out loud.
Nonetheless, I remember who has indicated in the past the low freq. distinction as a sign that the HW should be different.Yep, of course and it's very likely the inbuilt bridge was swapped out however if you hunt through the datasheet there are still a # of differences to the 3.2 GHz model including weight = lesser HW.
But when the # of VNA data points are wrong by an order of magnitude it screams someone is not doing their job !