And you can see lot's of people that would buy it to tweak fan and play with it.
It was around 22uV Stdev (AC RMS) with those settings at 50 Ω, at 1MΩ around 32 uV Stdev.
But make a note that when you enable 20 MHz BW on Rigol it enables lowpass filtering in software.
That is equivalent of enabling ERES on Siglent, which Siglent does not do automatically.
If we enable appropriate ERES then we get 17-18uV at 50Ω, and 29-30 at 1 MΩ.
Make note that Siglent has less noise at higher frequencies and Rigol a bit less at low frequencies.
This make me interested about 1000X HD. I'm curious enough to wait for it ...
I would wait for DHO800 to be released to sales and actually available to test before decision, regardless of 1000X HD..
I see too many little (and not so little) possible annoyances of not fully finished product with many weird design choices and price mandated compromises...
And you can see lot's of people that would buy it to tweak fan and play with it.
Which is fully OK, if your hobby is playing with the scope. If you want to do things with the scope in reliable manner and use to do other electronics (hobby and/or pro) I would wait and see how it actually works in real life.
One reason for the long bootup time is the fact that Rigol is using an userdebug build. An user build (which doesn't offer e.g. adb root) boots much faster. I'd assume 5-20 seconds boot time reduction.
it sounds like the full sleep mode is complex because it relies on Rigol having wired it with independent power rails for logic & processing, and you'd have to reconfigure all the logic when coming out of standby (how long does that take?).
Alternatively "PS Clock Control" can take the (FPGA) Arm processor from 766MHz to 30MHz which would save power in a standby mode, but I don't know if that would also underclock the power-hungry logic?
What prevents Rigol from hiring that person?
September 8 is the release date! Dave should finally post the review! (I hope so)
It is interesting to note that for Android 7 TV boxes based on the same SoC, like H96 MAX, typically use 5V 2A power supplies. Of course, the DHO800/900 also have a built-in display, and its backlight is likely to draw quite a lot of power, relatively speaking. I don't expect the front panel controls to draw much power at all (even the LED lights in them), so it really depends on whether reliable software control over the power hungry subsystems in the scope is possible or not. Often the turning off part is easy, and the turning on in the correct order, reliably, is the hard part.
(Which is also why I would not be surprised at all to find out that the Rigol DHO800/900 systems integration team were still working on exactly this. Having the system work reliably first, then concentrate on optimizations like bootup and power saving modes, would be the best approach, in my opinion.)
So one should not be surprised that it's takes years to initially develop such an ADC, and more years to get it right!!
Agreed. I just watched Dave's teardown and it looks like a neat little scope. But keeping Rigol's track record for putting unfinished products on the market in mind, it would be wise to hold off any purchase if the goal is to use the scope for any real work. But for an extra scope it might be worthwhile just to have 12 bit resolution with a relatively low noise level (if this model has a good low noise performance) at a low cost.
Ok then. So what sort of batter are we talking about here to feed 30 watts constant power? For example to be large enough for the same sorts of duration as a laptop? Sounds a bit like a laptop battery then? Hmm but for what voltage?
So one should not be surprised that it's takes years to initially develop such an ADC, and more years to get it right!!The devil is on the details with those things. You don't have access to standard resistors. you can't just go : i need 10k.. that is not guaranteed. The only thing that you can be sure of is ratios. Resistances are specified in units. for example 1 micron by 1 micron for technology x gives you roughly 1k. make the thing 2x1 ( double wide ) and it halves (~500r) . Make it 1x2 ( double long ) and it doubles (~2k). You don't care about the actual value. You care about the ratios. So making a an R-2R network or reference divider ladder is simple and accurate... you'd think....
The problem is they cannot guarantee layer uniformity. During the vacuum deposition of resistive layer the wafer may not sit perfectly flat and there could be a slight thickness gradient across the wafer. A resistor on the left may be thicker ( so lower value) than a resistor on the right. Drat... so what if we split the resistors in a voltage divider. We stick one half of each left , and one half of each right. Then the gradient self compensates and the ratio is correct again.. good. But what if the wafer or gradient rotates 90 degrees .. fffffuuu.... So we split the resistors in 4 equal pieces and position the north east south west. Now it doesn't matter which way the thickness gradient goes over the wafer. It cancels out.
I did that on an 8 bit reference ladder for a 17MHz adc in 1995. It's not easy to do that place and route...
The same goes if you need to do current mirrors. You can't guarantee there is no gradient , so split the transistors in 4 quadrants , then bundle. It makes very interesting layouts.. like checkerboards.. it's called Common Centroid Layout
further reading : (warning : causes severe headaches....)
http://class.ece.iastate.edu/vlsi2/docs/Papers%20Done/2000-06-TCAS2-YC.pdf
https://www.researchgate.net/publication/301828945_Layout_Symmetries_Quantification_and_Application_to_Cancel_Nonlinear_Process_Gradients
What prevents Rigol from hiring that person?Simple, $!!!
These folks would likely command a salary/bonus in the region of the Rigol CEO
and they would become quickly bored with only this product chip-set.
These 'scopes are going to dominate the market for the next two or three years at least.
September 8 is the release date! Dave should finally post the review! (I hope so)
September 8 is the release date! Dave should finally post the review! (I hope so)Dave doesn't do full reviews. It is a lot of work that ends up in boring videos.
He is content producer. He does unboxing, and simple demonstrations because those have good price performance.
This is not me criticizing him, but simply a fact.
We will wait and see. I predict there will be bugs and there will be outrage and there will be fangirls and there will be trolls and, well there will be pretty much the same as what happens when a company popular with the hobby consumer crowd releases a new technological iteration of their product.
I am sure it will be an OK product for the price.
I am sure it will be an OK product for the price.
I predict there will be bugs and there will be outrage and there will be fangirls and there will be trolls and, well there will be pretty much the same as what happens when a company popular with the hobby consumer crowd releases a new technological iteration of their product.
I predict all out war with the Siglent fanboys.
Nope, sorry, haven't even started shooting it yet.
Nope, sorry, haven't even started shooting it yet.Good, then we have time to remind you about internal reference frequencies and Project Yaigol.
Here, maybe like never before needs eyes wide open.
Nope, sorry, haven't even started shooting it yet.Good, then we have time to remind you about internal reference frequencies and Project Yaigol.