Author Topic: New Rigol 16-bit function generators DG800/900 series  (Read 20203 times)

0 Members and 1 Guest are viewing this topic.

Offline David Hess

  • Super Contributor
  • ***
  • Posts: 9902
  • Country: us
  • DavidH
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #100 on: November 25, 2018, 12:47:14 am »
Cases are deliberately designed like that to prevent stacking anything on top when the device has power dissipation problems.  Less than 30 watts and they needed to do that?
« Last Edit: November 25, 2018, 12:59:37 am by David Hess »
 

Offline Mr. Scram

  • Super Contributor
  • ***
  • Posts: 7695
  • Country: 00
  • Display aficionado
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #101 on: November 25, 2018, 12:55:58 am »
Cases are deliberately designed like that to prevent stacking anything on top when the device has power dissipation problems.
The ridges seem intended to allow stacking, just while leaving a considerable vent.
 

Offline David Hess

  • Super Contributor
  • ***
  • Posts: 9902
  • Country: us
  • DavidH
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #102 on: November 25, 2018, 01:00:29 am »
Cases are deliberately designed like that to prevent stacking anything on top when the device has power dissipation problems.

The ridges seem intended to allow stacking, just while leaving a considerable vent.

I had to find some other photographs to see that  It is still pretty extreme even to cool up to 30 watts passively.
 

Offline Wolfgang

  • Super Contributor
  • ***
  • Posts: 1137
  • Country: de
  • Its great if it finally works !
    • Electronic Projects for Fun
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #103 on: November 25, 2018, 01:15:35 am »
Cases are deliberately designed like that to prevent stacking anything on top when the device has power dissipation problems.

The ridges seem intended to allow stacking, just while leaving a considerable vent.

I had to find some other photographs to see that  It is still pretty extreme even to cool up to 30 watts passively.

The intention is clear, only its not very practical. Its for people with indefinite desk space. If every instrument designer does this, we need labs several times as large.
 

Offline David Hess

  • Super Contributor
  • ***
  • Posts: 9902
  • Country: us
  • DavidH
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #104 on: November 25, 2018, 01:47:57 am »
Even if passive cooling is not feasible, a low speed fan with a filter to keep the dust out will move enough air to make a huge difference, be silent, and last for decades.

 

Offline Wolfgang

  • Super Contributor
  • ***
  • Posts: 1137
  • Country: de
  • Its great if it finally works !
    • Electronic Projects for Fun
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #105 on: November 25, 2018, 02:08:08 am »
Yeah, agreed. If the price for pure passive cooling is that all such test equipment must be arranged side by side and cannot be towered, the price is definitely too high. What a lot of manufacturers could also do is implement better fans with less noise. The extra cost is not that high, and the annoyance factor of noisy fans is significant.
 
The following users thanked this post: xrunner, eplpwr

Offline Mr. Scram

  • Super Contributor
  • ***
  • Posts: 7695
  • Country: 00
  • Display aficionado
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #106 on: November 25, 2018, 02:36:43 am »
Yeah, agreed. If the price for pure passive cooling is that all such test equipment must be arranged side by side and cannot be towered, the price is definitely too high. What a lot of manufacturers could also do is implement better fans with less noise. The extra cost is not that high, and the annoyance factor of noisy fans is significant.
Again, these should be stackable due to the fins providing a surface to put anything flat bottomed on. It seems to be the whole point of the design.

Besides, fanless signal generators are feasible. GW-Instek and others do it without much trouble in regular cases. Fans are a weak point and a nuisance, so fanless designs seem preferable.
 
The following users thanked this post: thm_w

Offline David Hess

  • Super Contributor
  • ***
  • Posts: 9902
  • Country: us
  • DavidH
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #107 on: November 25, 2018, 02:54:55 am »
Besides, fanless signal generators are feasible. GW-Instek and others do it without much trouble in regular cases. Fans are a weak point and a nuisance, so fanless designs seem preferable.

Usually fans are a weak point and nuisance but at low powers, below 100 watts, and where passive cooling is marginal, they can be used without any compromises.  It takes very little airflow to make a huge difference.
 

Offline maxwell3e10

  • Frequent Contributor
  • **
  • Posts: 420
  • Country: us
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #108 on: March 23, 2019, 08:28:24 pm »
Has anyone got a chance to test these function generators, measure pulse jitter or noise spectrum?
 

Offline bd139

  • Super Contributor
  • ***
  • Posts: 11159
  • Country: gb
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #109 on: March 23, 2019, 08:31:44 pm »
Specs are shit compared to the old ones so I skipped buying one recently.
 

Offline maxwell3e10

  • Frequent Contributor
  • **
  • Posts: 420
  • Country: us
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #110 on: March 24, 2019, 04:17:02 pm »
The problem with Siglent SDG2000X series is that it has only one Aux In/Out BNC, whereas a proper generator should have Sync, Modulation, Trigger or even more BNCs for each channel. DG800/900 is a little better, with two BNCs, one for each channel. Keysight 33500 series has three auxiliary BNCs.

And what is it with these generators including a counter? I understand its easy to implement a crappy counter, but why waste a BNC for it? Except for the most basic models, I don't imagine it would be a selling point. Better to use that BNC as a trigger or another function generator control.
 

Offline TurboTom

  • Frequent Contributor
  • **
  • Posts: 592
  • Country: de
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #111 on: March 24, 2019, 06:35:11 pm »
The problem with Siglent SDG2000X series is that it has only one Aux In/Out BNC, whereas a proper generator should have Sync, Modulation, Trigger or even more BNCs for each channel. DG800/900 is a little better, with two BNCs, one for each channel. Keysight 33500 series has three auxiliary BNCs.

And what is it with these generators including a counter? I understand its easy to implement a crappy counter, but why waste a BNC for it? Except for the most basic models, I don't imagine it would be a selling point. Better to use that BNC as a trigger or another function generator control.

That was almost exactly my comment on the AUX capabilities of the SDG6000X. Considering this is Siglent's "top of the line" generator, it's rather poorly equipped. The Rigol DG4000 series offers much more regarding these additional functions though it's got other shortcomings. A merger of several of these generators would probably be what we're looking for...  ;)
 

Offline frozenfrogz

  • Frequent Contributor
  • **
  • Posts: 888
  • Country: de
  • Having fun with Arduino and Raspberry Pi
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #112 on: March 24, 2019, 08:11:48 pm »
I got a DG812 a week ago. So far I am very happy with it. :)

The UI needs a bit getting used to, especially accessing the deeper menus for trigger sync etc. - mainly because using a touch screen on test gear is somewhat counter-intuitive for me.
He’s like a trained ape. Without the training.
 

Offline tv84

  • Frequent Contributor
  • **
  • Posts: 795
  • Country: pt
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #113 on: May 13, 2019, 08:28:49 pm »
Let's spice things up a bit!

Maybe they don't look so ugly after alll...     :popcorn:
 
The following users thanked this post: thm_w

Offline bd139

  • Super Contributor
  • ***
  • Posts: 11159
  • Country: gb
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #114 on: May 13, 2019, 08:56:54 pm »
Looks like an Android phone screen as sold in an Indian tech market in 2011  :-DD

Only joking. I'm still not giving up my DG1022Z for one.

The crack is however impressive if it actually kicks out 100MHz.

What does the attenuator go down to when you set it to 50 ohms impedance?
 

Offline tv84

  • Frequent Contributor
  • **
  • Posts: 795
  • Country: pt
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #115 on: May 13, 2019, 09:07:13 pm »
The crack is however impressive if it actually kicks out 100MHz.

What does the attenuator go down to when you set it to 50 ohms impedance?

No "crack". It's a feature.

Can't do that test right now. But stay tuned...   ;)
 

Offline thm_w

  • Super Contributor
  • ***
  • Posts: 1292
  • Country: ca
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #116 on: May 13, 2019, 09:12:42 pm »
Let's spice things up a bit!

Maybe they don't look so ugly after alll...     :popcorn:

Nice work, so DG811 may be able to be upgraded to DG992 as well?
Will definitely buy one if that is the case.  :-+
 

Offline tv84

  • Frequent Contributor
  • **
  • Posts: 795
  • Country: pt
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #117 on: May 13, 2019, 09:25:14 pm »
Nice work, so DG811 may be able to be upgraded to DG992 as well?

 ::)

Edit: I didn't meant to be disrespectful. I looked at the emoji just by its graphical look: "Hmmmm, let me see..."
« Last Edit: May 14, 2019, 11:36:30 am by tv84 »
 
The following users thanked this post: thm_w

Offline thm_w

  • Super Contributor
  • ***
  • Posts: 1292
  • Country: ca
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #118 on: May 13, 2019, 09:34:27 pm »
::)

The specs between DG811 to DG832 appear to be the same (datasheet quotes 100MHz bandwidth), so the cap is presumably done in software.

edit: :)
« Last Edit: May 15, 2019, 07:56:13 pm by thm_w »
 

Online bitseeker

  • Super Contributor
  • ***
  • Posts: 7852
  • Country: us
  • Lots of engineer-tweakable parts inside!
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #119 on: May 13, 2019, 10:11:03 pm »
Let's spice things up a bit!

Maybe they don't look so ugly after alll...     :popcorn:

Still ugly on the outside, but you make them much nicer on the inside. :-+

No "crack". It's a feature.

Yes, we like features! I actually wasn't expecting the 8xx series to be able to do 250 Msps. It's good to know that "it's in there."



I foresee a sudden spike in 811 sales. >:D

And maybe cans of black paint. ^-^
« Last Edit: May 13, 2019, 10:21:26 pm by bitseeker »
I TEA.
 

Offline frozenfrogz

  • Frequent Contributor
  • **
  • Posts: 888
  • Country: de
  • Having fun with Arduino and Raspberry Pi
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #120 on: May 14, 2019, 04:48:16 pm »
Sooo. Would you mind elaborating on how you got DG992 firmware on the 832? @tv84
He’s like a trained ape. Without the training.
 

Online bitseeker

  • Super Contributor
  • ***
  • Posts: 7852
  • Country: us
  • Lots of engineer-tweakable parts inside!
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #121 on: May 14, 2019, 05:09:11 pm »
I'm sure elaboration will come in good time. Perhaps a thread for it, too. ;)
I TEA.
 

Offline tv84

  • Frequent Contributor
  • **
  • Posts: 795
  • Country: pt
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #122 on: May 15, 2019, 09:08:52 am »
As soon as I have a DG811 test, I'll post the method. The FW is the one that comes with the SG.
 
The following users thanked this post: thm_w, bitseeker, frozenfrogz, bd139

Offline Sighound36

  • Contributor
  • Posts: 27
  • Country: gb
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #123 on: May 15, 2019, 04:58:09 pm »
Hi Tv84

I suspect your latest endevours will work with the DG822 as well

Also many thanks for your work with the MSO 5000 to  :-+
 

Offline thm_w

  • Super Contributor
  • ***
  • Posts: 1292
  • Country: ca
Re: New Rigol 16-bit function generators DG800/900 series
« Reply #124 on: May 15, 2019, 08:20:30 pm »
As soon as I have a DG811 test, I'll post the method. The FW is the one that comes with the SG.

Thank you, I've ordered DG811 so will check back when it arrives if you have not tested it already.

Another thing I noticed is DG800/DG900 both do not come with ethernet as standard, they require a $60 USB to ethernet adapter. Thats not bad, but the adapter looks to be the same as you can get on ebay for $5. We can either open that adapter or test some different chipsets to see what works (chipset might be referenced in the firmware somewhere?).
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf