Products > Test Equipment
JunTek PSG9080 Programmable Signal Generator (80 MHz - 300 MSa/s - 14-bit)
TheDefpom:
My review video is online already for my Patreons, but I suppose I could give you guys a look at it before it becomes publicly available... here it is:
If you jump on to YouTube the video has links and chapters if you want to skip through it: https://youtu.be/b3yFxg2LwXI
TurboTom:
--- Quote from: JOHN LEE on September 18, 2020, 04:03:33 am ---As far as I know, the maximum output frequency of DG811 is 10MHz, the sampling rate is 125Msa/S, and there is no programmable function, which can realize automatic output. I found that PSG9080 is grounded during use, which is safer to use. PSG9080 dual-channel maximum output is 80MHz. This price is quite cost-effective. If the requirements for AWG are not high, you can also consider JDS6600. I have a JDS6600 that has been working stably for 2 years. It works very well.
--- End quote ---
That's why I suggested to hack the DG811 which basically turns it into a DG992 (less the top-end -- >70MHz -- level accuracy). For hobby use, this shouldn't cause much headache since it's completely reversible (in case of warranty claims) and is accurately documented in the corresponding thread. The DG800 is ground-referenced as well if that's a concern to you. I rather had it floating since this eliminates the risk of introducing ground-loops if working on a DUT or other test gear that's grounded itself.
Properly designed gear that's not ground-referenced isn't any more dangerous to use than properly designed grounded gear. And you can always ground-reference it by installing a grounding strap. The other direction isn't as safely possible to arrange.
But that's off-topic, sorry for that... :-//
TheDefpom:
In the review I show how the earthing is setup in the unit (in the teardown section), you can choose whether or not to have it earth referenced.
TurboTom:
Yes, in general that's a good approach. But having the ground wire lugs screwed down with self-tappers into plastic receptacles is more than a no-go. Or are there threaded brass inserts in the plastic standoffs of the lower casing member? It's plainly dangerous if there aren't.
Moreover, the BNC terminals are only attached to the PCB, there's no mechanical support at the front and rear panel. So every access to the BNCs will stress the main PCB.
This is all toy-like quality, IMO the instrument is too expensive for what you get.
TheDefpom:
I think that electronically it is good, but mechanically there is some room for improvement, I would have preferred a metal chassis myself, for shielding and for the points you raised with regards to securing items to the case.
Even if they are using threaded inserts (I didn't remove any boards so I don't know) all plastics fail eventually and these will split (as a result of molecular shrinkage due to changes in the molecular weight, from the polymer chains breaking down into shorter ones giving increased density of the polymer chains, but this takes many years depending upon ambient temperatures, light exposure etc.).
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