Products > Test Equipment
Siglent SPD3303C Series Programmable DC Power Supply, Siglent fails to respond
nctnico:
A better course of action would have been to return the power supply and buy a different one. If it is still under warranty, I'd return it for a refund.
7thSenpai:
--- Quote from: cos on January 19, 2024, 10:47:31 am ---
--- Quote from: 7thSenpai on January 15, 2024, 10:56:40 pm ---Any chance you can get firmware 1.02.01.01.03R9 (firmware that is shipped with units around a year ago) for us folks with hardware rev 1? 1.02.01.01.03R10 is full of worms.
--- End quote ---
Please describe the "worms" you found. May be helpful for problem solving.
Thank you.
--- End quote ---
Sorry I really ment to reply to Tautech as Im not very forum savvy (I needed to quote :palm:). I believe he has some kind of affinity with Siglent's team from reading some other posts.
I didn't bother to do any serious test to report. The "worms" was really ment as whatever issues was raised in the OP here (by you) plus my main issue, which I will try explain in better detail - to me is a deal breaker forces me to revert to R6.
All firmware I mention is based on 1.02.01.01.03XX Hardware Revision 1
-Settings go back to default after power cycle in R10. The default setting is 5.00V and 0.40A in R10. Previous versions ( R9 and below ) last voltage and current setting are recalled after a power down and power up cycle. There was no mentions in the firmware notes that says it will change this, and why even lose this feature?
-At some firmware revision point below R6 somewhere, max voltage in Series Mode went from 32V / ch. to 30V / ch. I cannot verify this however, mine was shipped with R9 and has always been 30V / ch. in Series. I had a lot of confusions when I got this unit seeing this power supply was used in some audio amplifier based youtube channel (John Audio Tech) where he can set it to 32V / ch. Is this is bug? Not sure but I was under the impression I will be able to do 64V, this is not that big of a deal to me, but even going through the specsheet now doesn't bother to mention this limitation, and really why should it be limited to 30V / ch. in Series Mode? I can go around this by going back to independent mode to 32V. / ch and wiring it up but not the point.
I have still have not received any more replies from Siglent NA. I'm not expecting them to anymore really because I don't wish to spend any more time with this problem. Solution is return if I was able to, which I am not. Or look for a new power supply which I will eventually do. R6 will have to do for couple years.
electr_peter:
--- Quote from: cos on June 22, 2023, 06:51:45 am ---Power Input
The unit was set for 220V mains voltage, I changed that to 230V.
However the active fuse was T6.3A/250V which is for 100V/120V mains voltage.
I would expect that when set for 220V, it would also have the associated fuse installed which was clearly not the case.
Maybe this was caused by confusion as the fuse labeling on the rear panel of the instrument has no clear division between the mains voltages and the fuse ratings, see attached photo "Fuse Selection".
A vertical dividing line might solve this.
Although chapter "General Safety Summary" of Ref.1 enclosed in the packaging box has a section "Use the proper fuse", specifying the correct relation of fuse values and mains voltages there is no check for this in Chapter 1, section "Safety Considerations" para "Input Power Requirement".
Note: The same applies for Ref.2.
Anyway, the spare section of the fuse holder contained a T3.15A/250V fuse. I swapped both fuses and will replace the T6.3A/250V by a second T3.15A/250V fuse.
--- End quote ---
I can confirm that older SPD3303C unit was set to 230VAC, but active fuse was 6.3A. 3.15A fuse was in holder as well, so it is an easy change.
slugrustle:
--- Quote from: 7thSenpai on January 20, 2024, 02:44:33 pm ----Settings go back to default after power cycle in R10. The default setting is 5.00V and 0.40A in R10. Previous versions ( R9 and below ) last voltage and current setting are recalled after a power down and power up cycle. There was no mentions in the firmware notes that says it will change this, and why even lose this feature?
--- End quote ---
I noticed this on my SPD3303C (version 1 hardware) after upgrading to 1.02.01.01.03R10. That bugged me, but I also wondered if my memory of previous operation was mistaken. I resorted to saving my settings as preset #1 and reloading on startup. I tend to keep the same settings for a while with the testing that I do.
--- Quote from: 7thSenpai on January 20, 2024, 02:44:33 pm ---At some firmware revision point below R6 somewhere, max voltage in Series Mode went from 32V / ch. to 30V / ch. I cannot verify this however, mine was shipped with R9 and has always been 30V / ch. in Series. I had a lot of confusions when I got this unit seeing this power supply was used in some audio amplifier based youtube channel (John Audio Tech) where he can set it to 32V / ch. Is this is bug? Not sure but I was under the impression I will be able to do 64V, this is not that big of a deal to me, but even going through the specsheet now doesn't bother to mention this limitation, and really why should it be limited to 30V / ch. in Series Mode? I can go around this by going back to independent mode to 32V. / ch and wiring it up but not the point.
--- End quote ---
The firmware release notes at https://siglentna.com/wp-content/uploads/dlm_uploads/2023/11/SPD3303C-Firmware-Revision-History.pdf say that the 60V limit was applied in version 1.02.01.01.03R6.
Regulatory compliance is the likely reason for this update. 60VDC is cited as the touch safe DC voltage limit in a dry environment in some regulatory standards (UL, IEC, etc.). I don't have access to these documents outside of work, but if memory serves, at least some of them have that limit. I don't see a regulatory standard listed in any of the documentation for the SPD3303C, but going on a manual for another power supply and the presence of a CE mark on the SPD3303C, my best guess is they constructed it to IEC 61010-1.
slugrustle:
While I really like the SPD3303C, and the value for money is very hard to beat, one thing bothers me the most about it: On a couple of occasions, I have had the supply switch to random settings after accidentally shocking it with ESD while plugging something in or pressing a button. I now am careful to always wear an ESD strap when operating the SPD3303C, even I'm only touching the supply itself and not the circuits that I'm testing.
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