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| Rigol DP832 - Firmware list and bugs |
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| TurboTom:
Yes I found similar ugliness on mine - Rigol doesn't use relays to disable the outputs and I guess to compensate for the leakage of the pass transistor (and accompanying circuitry), they implemented a pull-down resistor to some internal negative rail. The current, especially when measured with a very low burden voltage ammeter, can be considerable but may vary from output to output (or device to device) considerably -- your finding of 98mA is quite high though. I consider this problem a minor annoyance since the voltage is quite low, so damage to some connected circuitry is not to be expected. If you want to use the supply in current control mode to feed magnetic coils for some exotic measurements, though, you should be cautious about this problem or make sure there is sufficient ohmic resistance so the (very low) voltage won't cause any significant current to flow. Cheers, Thomas |
| IAmBack:
--- Quote from: dsperlich on August 16, 2017, 03:14:56 pm ---I received my DP832 today and noticed something strange. When i have the outputs disabled, but connected to my unfused 10A range of my multimeter, there is a significant current flow, different from channel to channel. Channel 1: 98mA Channel 2: fluctuating between -10 and -36mA (see scope shot for waveform on multimeter input, the other two channels are stable) Channel 3: -17mA When i select 1mA current limit on all channels and i enable them one by one, only channel 1 drops to 0mA (or i guess 1mA, is in the uncertainty of my multimeter :-) For the other channels i have to set a least 10mV (i don't have the high res option enabled yet) and 1mA to get the expected reading of 0 to 2 mA. The voltages of the disabled channels are of not so much concern (especially given the cheap nature of my multimeter): Channel 1: 4mV (off) 3mV (on @ 0V) Channel 2: -5mV (off) -5mV (on @ 0V) Channel 3: -1mV (off) -1mV (on @ 0V) Did anyone observe the same effect, i couldn't find anything mentioned so far but i might have missed it. My DP832 came with firmware version: 00.01.14.00.03 and analog boards: 03.02.04.03.02.04 --- End quote --- Lover currents, but I also see them... |
| Tim5000:
--- Quote from: Sparky on January 05, 2014, 10:04:05 pm ---1. LM317 voltage regulator overheating and causing shutdown Rigol have "resolved" this issue with a v02.10 board revision as shown in these photos by Dave. Apparently this revised board is shipping in all new units manufactured from roughly Oct/Nov 2013. For units manufactured before that date, Rigol plans to replace units with older boards for free. >> DIY: A number of users have posted custom fixes, typically replacing the LM317 for an alternate regulator. Refer to this post by ted572 for a professional looking and inexpensive solution ($1.44), which would probably save time as well. --- End quote --- Hi, Is there a way to tell if my device is afflicted by this without taking it apart and breaking the Warranty seal? i.e. a specfic serial number etc? I guess it's probably too old to worry about the warranty now anyway but I'd still prefer not to if there's an easy way to tell. :) Thanks. EDIT: I managed to shine a torch through the vents on the right hand side and could just see the top board version. It looks like I've got the 2.10 board so it must have got caught early on :) |
| Silveruser:
RE RANDOM REBOOTS Back on page 18 or so there were mentions of random reboots, I've seen them before and while sitting reading the forum another just happened. Low load on one channel, screen saver on, channel shuts off and system reboots leaving channel off. Has anyone ever found a solution for this or it just so rare? I've had it running for days without problems then tonight about an hour on it reboots. George |
| Rbastler:
--- Quote from: Silveruser on September 28, 2017, 01:37:11 am ---RE RANDOM REBOOTS Back on page 18 or so there were mentions of random reboots, I've seen them before and while sitting reading the forum another just happened. Low load on one channel, screen saver on, channel shuts off and system reboots leaving channel off. Has anyone ever found a solution for this or it just so rare? I've had it running for days without problems then tonight about an hour on it reboots. George --- End quote --- I never had random reboots. Im powering a AD584 to age it, the whole day and no problems so far or in the past. |
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