Products > Test Equipment
Rigol DP832 - Firmware list and bugs
mcinque:
hmm... you're damn right. Just connecting any DSO ground clip you're making voltage flow thru the components. :palm:
On the DP832 I measured these values between the ouput (+ or -) and mains ground:
* CH1 20.460VAC 58uA
* CH2 21.876VAC 61uA
* CH3 21.868VAC 61uA
I will do some experiments to see if I can kill intentionally any component with that output.
While on my PL303 by Aim-TTi these ones:
* CH1 22mVAC 214uA
And these are the scope screens while the PSU is ON and OFF (even after shorting the output to discharge the filter cap, I can read some AC voltage on any output :-//).
diyaudio:
--- Quote from: thn788 on March 31, 2015, 12:32:12 pm ---I've checked our 4 DP832As and 2 DP832s: all show similar measurements as posted here by others already.
We use these Rigol PSUs on a daily basis for more than one year, now (replacing Agilent E3649A PSUs) to power our own custom designs, as well as off-the-shelf eval-boards; sometimes powering the devices "only" through their on-board regulators, sometimes powering chips directly from the Rigols, e.g. in cases where on-board regulators of the designs are not yet working properly or are not present at all in the first place. This also includes powering 32-bit SoCs or PMICs directly from the Rigol, sometimes.
So far not a single device (of the probably hundreds or thousands we have used) has ever suffered any damage from the Rigol PSUs; no matter if the devices are only connected to the PSU alone or also to Ethernet-Switches, USB-, RS232-, CAN- or other ports of different PCs at the same time or whether somebody uses oscilloscopes or logic analyzers from various different brands on "life" devices.
--- End quote ---
This a great news, I just ordered a DP832 which cost me alot and reading the last few posts made me rather nervous.
H.O:
--- Quote ---hmm... you're damn right. Just connecting any DSO ground clip you're making voltage flow thru the components.
--- End quote ---
Well, no, voltage doesn't flow thru anything but never mind....
On my DP832 Ch2 and Ch3 are the worst ones with 19VAC 50Hz open loop voltage and a "short circuit" current of 13uA measured with a FLUKE189.
If I measure the AC voltage while "loading" the supply with the impedence of my body by placing my left hand index finger on one probe and my right hand index finger on the other probe the 19VAC drops to 5VAC. Measuring the resistance from finger to finger shows around 2M which suggest that the "supply" is pretty weak.
Howardlong:
Microchip have an interesting application note here http://ww1.microchip.com/downloads/en/AppNotes/00521c.pdf where they advocate current limiting 110VAC to 35uA by using a 5Mohm current limiting resistor straight onto a device pin, using the clamping diodes to limit voltage.
Guni:
I've just found this by case. Small unboxing of DP832 on chines website. Nothing special except... full color display on non-A model. It looks like some early firmware.
Color display is not a big deal but I'm curious if you know something about this ?
Source:
http://www.hkepc.com/forum/viewthread.php?tid=1953803
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