btw what do you mean with that "yaigol" thing? are rigol scopes crap or something?
Judge for yourself:
https://www.eevblog.com/forum/projects/project-yaigol-fixing-rigol-scope-design-problems/I knew about the firmware issues but I wasn't aware of that thread until very recently when someone mentioned it in another thread. And at least for me it was reason enough to decide against investing even just the less than £300 + VAT the DS1054z costs.
The 1054Z firmware is incredibly complicated compared to an ancient scope like an HP 54645D so it is inevitable that there will be bugs.
No, it isn't. Seriously. The 54600 Series scopes may be old, but the firmware isn't really less complex than that in the Rigol. Also, most of the advances in functionality that the DS1000z offers are simply down to cheaper and faster hardware and more memory. And we should not forget that the DS1000z is essentially a bottom-of-the-barrel scope, with very basic capabilities. There's nothing overly complex in its firmware.
And I'm not even comparing the Rigol firmware against some really complex firmware as the one in the old LeCroy 9300 scopes.
Using compexity as an excuse of why the DS1000z was released with bug-ladden firmware is laughable. And it's funny how the big brand manufacturers managed to provide even early scopes with very mature firmware, even back then when development toolset were much more crude than today.
At least Rigol do generally fix the bugs.
Yes, eventually. Today there aren't many firmware bugs left on the DS1000z, but if you bought the scope when it came out you had to wait for quite a while before it reached a state it really should have been when it was released.
I wouldn't buy an older DSO. Small memory means you barely get any of the advantages of having a DSO over an analogue scope. The noise floors on older DSOs tend to be pretty bad as well.
Maybe if you look at a digital scope from the '80s but the '90s had quite a few DSOs that are much more capable than an analog scope (and even back in the '80s there were some good digital scopes with decent memory and functionality like the LeCroy 9400). Which analog scope does offer maths, waveform analysis, jitter analysis, FFT and so on? Yeah, none.
The noise floor of the HP 54600 Series and the LeCroy 9300 Series is actually quite good. And not all older scopes come with tiny memory. The HP 54645D I bought for example has 1M per channel which is quite useable, plus it comes with the MegaZoom ASIC which offers a very high waveform update rate.
As mentioned, the LeCroy 9300 Series scopes come with up to 8M sample memory.
As far as serviceability I wouldn't say that older DSOs are any more serviceable than a newer scope. A lot of the service manuals for the early DSOs are a long the lines of "do these steps to find out if the logic board is bad, if it is then replace the entire logic board". People often then charge an arm and a leg for the boards because they know there is some poor sod out there still using one of those scopes for some test fixture and will pay a ridiculous amount to get it working again.
Not really. Finding most parts for a 54600 isn't difficult simply because there's still a very large number of these scopes out there, plus many that get canibalized for parts. The same is true for the 9300 Series from LeCroy, and many other scopes from that vintage. You can even get new CRTs for these scopes.
Also, because the boards on these scopes are a lot less tightly integrated they are in general much easier to repair. If one of the proprietary ASICs have died then repair is often not possible but in this case just get a replacement board from another scope. Thankfully the ASICs in these HP and LeCroy scopes are a lot more robust than some of the special purpose ICs in older Tek scopes.
With something like a 1054Z there isn't much that would go wrong. With extended use you might wear out the rotary encoders but they are a generic part. I think a few people have been unfortunate enough for the powersupplies to go bad (bad caps?) and you can get replacement LCD displays for them.
Well, as the "Yaigol" thread shows this isn't all that can be wrong in these scopes.
Also, the DS1000z is tightly integrated, with little ways of repairing it. Plus Rigol doesn't even have anything that can be called a 'Service Manual'. It's really a throw away item.