Rigol 832 no longer providing a load - Page 1
Forum section: electronics / repair

author: bitman
author_rank: Unknown
timestamp: November 25, 2018, 02:38:18 am
content: My "trusty" Rigol DP832 decided today that running at 2.5Amps was too much for it. At least that's how I interpret it. Running at 8V and 2.5Amps for about 30 seconds, and all of a sudden I heard the fan stop blowing to find that the voltage still stood at 8V but there were no load coming out. Both 1 and 2 (max 3A) are showing the same issue - the display works just fine, but no load is coming out.I've tried to spy on Dave's DP832 videos to see if there are simple fuses inside the box - but even if there is, the warranty seal of makes it pretty clear that you shouldn't find standard serviceable components in there. Any ideas? Would this be a simple blown fuse and that I easily replace? I'm not as "cool" as Dave to just take it apart and identity what-ever stopped functioning.

author: bitman
author_rank: Unknown
timestamp: November 25, 2018, 03:23:00 am
content: Ok - it cooled off for 15-20 minutes and things are working again. Interesting - but happy I didn't have to take it apart ... lesson learned, don't put too big a load on it for a "longer" period of time. No worries.

author: PTR_1275
author_rank: Frequent Contributor
timestamp: November 25, 2018, 03:26:16 am
content: 8v 2.5a load is not too much. It’s well within the spec of the psu. I have one at work that runs 13.5v 3a and 22v 3 amp for most of the day if I’m running a particular product test.What was the ambient temp when it faulted, other channels on / off / why load?How old is your 832? Is it the one that has the heat sink issues on the to-220 shown in Dave’s videos?

author: bitman
author_rank: Unknown
timestamp: November 25, 2018, 04:56:04 pm
content: Quote from: PTR_1275 on November 25, 2018, 03:26:16 amI only do very low voltage stuff - mainly old TTL/CMOS stuff and a bit of IoT - so my typical load is 5-9v and less than 1Amp. The unit is almost 2 years old, and I did check it for Dave's "fix" and that seems to be in place (large heat-sink just inside the grid). This is done in my home office/shop - the temperature is somewhere between 20-25 degrees depending on how hot the computers run at that time.So typically I only use the 3rd output - except when I need a negative rail. I just had some "new stuff" to test which had less than 10ohm resistance so the amps ran up with 8v.Typically the issues I have are due to user-error. Perhaps that's what happened here - not sure. Of course once I had the whole unit disconnected, and I'd posted this and done some googling, I went back, powered it on and the multi-meter showed a clear voltage, and it also measured amps well.From Dave's videos on this unit I don't see a basic fuse inside - outside of the component he replaced which was rated at 5amps. And since the unit is sealed I cannot imagine I have to go inside to look for burned out fuses.Anyway - for my use, this was not a typical load so I'm not worried. I cannot imagine the noise you have from it running it at that high a load. I thought my computers were noisy until I heard the fans in this thing start up

author: Wolfgang
author_rank: Super Contributor
timestamp: November 26, 2018, 04:28:25 pm
content: Not true. I am regularly grilling my DP832s with up to 10V/3A, and the perform absolutely OK. The fan gets louder, thats it.