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Rigol DP832 - Firmware list and bugs

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LaurentR:

--- Quote from: cidak on June 29, 2015, 01:51:52 pm ---Thank you for your quick and accurate response.
Ok, your Log on measured voltages in steps of 1 mV, seems to be perfect.
So I hom a problem it seems, because as explained initially each time increment of 1 mV ago the first increase 1.3mV and 0.7mV per second increase.
I calibrated DAC and ADC repeatedly my DP but the error is always the same.
I noticed, however, that when the output is turned off (or if you set the output voltage to 0V.) Offset output terminals is 0.550mV ~. Someone can do this check, please?
Thanks.

--- End quote ---

I don't see a problem with any of what you mention. Keep in mind that the accuracy specs for the DP811A are: 0.05% + 10mV. I don't see anything you've explained violating this spec. It's all way within spec, unless I missed something.

First, you have a DP811A. Over the 40V range with the 16b DAC, you can expect ~45V/64k = 0.69 mV resolution, which is what you see, so, as you program your 1 mV steps, it will be totally normal for the supply to jump by 0.69 mV or 2x0.69 mV as needed to get as close to the programmed value as possible. This closely matches the behavior you are describing.

The DP832 may offer slightly better resolution from its smaller range (~0.55mV on 30V and ~0.22 on 5V), but it's the same principle.

As far as the offset at 0, a quick look at my data shows that the very accurate Ch3 has a -0.29mV offset at 0. It's pretty common for the supplies to be slightly off at 0V (more so than later), but it's still completely within specs. I don't see a problem either.

Macbeth:

--- Quote from: bson on June 28, 2015, 10:44:01 pm --- Here's the reference - highly recommend it.  http://www.ebay.com/itm/10-VDC-2ppm-Precision-Voltage-Reference-Standard-Nulled-to-Fluke-732A-or-732B-/251756273626?pt=LH_DefaultDomain_0&hash=item3a9dd7dfda

--- End quote ---

Oh wow,  the Calibratory D-105 is back! It looks like our Awesome friend has upped his prices too.

Have you opened it to check if the build quality has improved at all?


That flakey piece of foil is all part of the magic apparently. Oh, don't open it as apparently that ruins the calibration. I think it's something to do with Schrodinger's cat and quantum entanglement. Don't worry, apparently GOD gave the inventor the inspiration to develop this standard, so you can be guaranteed that 2ppm accuracy. No need to open it or question how it works. Faith is all you need.

Was it the wall of text in the ebay advert or the presentation of testimonials that impressed you so much?

bson:

--- Quote from: Macbeth on June 29, 2015, 11:18:49 pm ---Was it the wall of text in the ebay advert or the presentation of testimonials that impressed you so much?

--- End quote ---
I'm not really interested in a bunch of children's pissing matches.  There's no need to be rude.  It's a rinky-dink $100 toy device (I think that's what I paid for it) and it has drifted absolutely none at all the last four months relative to my instruments.  Of course, it may all have drifted together, and no matter how unlikely or implausible, the only way to achieve mathematical certainty is by testing against an proper standard.  However, under the assumption that all my instruments of a variety of ages aren't all drifting in unison, it's perfectly fine what it does and I wouldn't hesitate to recommend it.  If this affronts you hoity-toity ivory-tower sense of superiority, so be it.  I couldn't give a damn.

cidak:

--- Quote from: Macbeth on June 29, 2015, 11:18:49 pm ---
--- Quote from: bson on June 28, 2015, 10:44:01 pm --- Here's the reference - highly recommend it.  http://www.ebay.com/itm/10-VDC-2ppm-Precision-Voltage-Reference-Standard-Nulled-to-Fluke-732A-or-732B-/251756273626?pt=LH_DefaultDomain_0&hash=item3a9dd7dfda

--- End quote ---

Oh wow,  the Calibratory D-105 is back! It looks like our Awesome friend has upped his prices too.

Have you opened it to check if the build quality has improved at all?


That flakey piece of foil is all part of the magic apparently. Oh, don't open it as apparently that ruins the calibration. I think it's something to do with Schrodinger's cat and quantum entanglement. Don't worry, apparently GOD gave the inventor the inspiration to develop this standard, so you can be guaranteed that 2ppm accuracy. No need to open it or question how it works. Faith is all you need.

Was it the wall of text in the ebay advert or the presentation of testimonials that impressed you so much?

--- End quote ---

The is OT discussion in area "DP832 Firmware list and bugs"

pascal_sweden:

--- Quote from: Owen on March 28, 2015, 07:52:08 am ---For your list of bugs and design flaws in the DP832: Youtuber Jason Li investigated that Rigol's DP832 seems not to be isolated to earth. There's an AC coupling between earth and ground (exceed 32 Vac). Here's the video:



--- End quote ---
Is this problem fixed in the mean time?

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