Products > Test Equipment

Rigol DP832 Random Reboots

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_Wim_:
I have 2 DP832 units that I use quite regularly (bought end 2014) So far I have never seen the reboot issue, but I haven’t watched for it specifically. They have never hang so far, that I am sure.

RoGeorge:
The only reset I saw on my DP832 was last month. Ch1 and Ch2 were in parallel (through a double diode, in order to charge a car battery). Both channels were set to 3A/18V each, while constantly logging the outputs values using SCPI commands over LAN (once a minute).

I was just increased the current from 0.3 to 3A (manually, on each CH1 and CH2 so the total generated power was under 85W), then after about 5 minutes at 80W, it reset under my eyes. After the reset, all the channels were in stop mode.

I couldn't reproduce the reset, so I let it charging the car battery over night at 2x3A and SCPI logging over LAN, and it didn't reset any more. Also, no other reset that I know of since I bought the DP832 about 2 years or so, but it was used only rarely, and usually for very small loads (1-10W for all 3 channels added).

I suspect the reset has something to do with the fact that SCPI commands were sent (for data logging) while manually changing the current from 0.3 to 3A. I am saying this because the last DP832 logged (in the PC) was at 0.3A, but the reset happened a few minutes later after the current was increased from 0.3 to 3A, so I should have seen a few records in the log at 3A, but there are no records logged at 3A. These are the last 3 records in the PC log:


--- Code: ---YYYY-MM-DD,HH:MM:SS,CH1(V),CH1(A),CH1(W),CH2(V),CH2(A),CH2(W),CH3(V),CH3(A),CH3(W)
...
2016-10-30,01:19:25,12.5654,0.3993,5.017,12.5716,0.3947,4.962,0.0000,0.0000,0.000
2016-10-30,01:20:25,12.5648,0.3993,5.017,12.5711,0.3947,4.962,0.0000,0.0000,0.000
2016-10-30,01:21:25,12.5644,0.3993,5.017,12.5706,0.3947,4.962,0.0000,0.0000,0.000
--- End code ---

During all this time, a DMM was also logging the battery voltage and current. The multimeter logged a few minutes between the manual current increase and the reset, but these minutes are missing from the DP832 log, so I guess it was like this:
- DP832 generating under 10W while logging the data into PC
- manually change the current (from the DP832 front panel) for CH1 and CH2 from 0.3A to 3A
- the software hang, because I have no 3A records
- after a couple of minutes, the DP832 reset. During these minutes, the DP832 was generating less then 100W, and the current was stable, and at the expected (as shown in the DMM logs).

I don't know where to look for the firmware version details. The 'Utility' -> 'System' shows 'Digital version: 00.01.11'. The hardware is the version with a big radiator (the radiator can be seen through the air holes).

This is what the DMM was logging. The blue cross is marking the DP832 reset. After the reset, all the DP832 were off. The charts shows the same values before and after reset because I manually turned on the DP832 channels after the reset. The various steps in the charts are because the current or voltage were manually adjusted in the DP832 a few times during the whole battery charging.

Pinkus:

--- Quote from: uski on February 11, 2014, 03:02:08 pm ---Hi,

I've heard about people replacing that linear regulator with a small switch-mode power supply module out of eBay, like this one :

http://www.ebay.com/itm/DC-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Supply-Output-1-23V-30V-/181227591312?pt=LH_DefaultDomain_0&hash=item2a32019690
DC-DC Buck Converter Step Down Module LM2596 Power Supply Output 1.23V-30V

$0.99 each, shipped.

(don't forget to adjust the output voltage before connecting it to the circuit)

uski

--- End quote ---
Seriously? Using a crappy Chinese $1 (including shipping) stepdown module (=made of 100% fake/dubious quality products*) for an expensive lab equipment  :scared:? If this fails (and chances are high it will at some day), it will fry your DP832.

* try to calculate. subtract shipping, packing, margin etc. you will find, they are producing this for a BOM of maybe $0.3. Now try to find LM2596, 2x 36V caps, 3A inductivity, 3A schottky, precision trimmer for $0.3 .... no way, even if you would go an buy 100K or 1M of them.


sdouble:
I suffer from that issue too.
I reported that here :
https://www.eevblog.com/forum/blog/eevblog-512-rigol-dp832-bad-design-investigation/msg1071713/#msg1071713
I use them with the 230V 50 Hz main. Are you also using it in europe ?

skrap:
Europe here, 230 VAC / 50Hz with what seems to be the latest hardware revision. At least the large heatsink but I can't confirm the new mosfets or not, firmware is the latest version and calibration was done in June. The supply works really well and is within spec. when it doesn't hang or reboot but this typically happens within a minute now no matter if the outputs are on or off. Since it's very repeatable I guess something on the digital side is overheating for some reason.

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