Thanks for the replies.
I'll check out the Siglent thread. The software that controls it from a PC is also used to to update the firmware using the file that was linked above. It says there's a version mismatch or similar. I've tried a few times.
Common is the point of connection between the CH1 and CH2 supplies. This becomes the circuit ground in cases needed a +/- power supply.
Connection is like this when the series button is pressed, if this makes sense:
(-) (+)--common--(-) (+)
+ on CH1 is connected to - on CH2.
So you can get CH1 and CH2 added together across them, in which case current would be the same. Or a negative voltage between CH1 and common and positive between channel 2 and common, currents would not be same. The manual doesn't show this specifically, but this is what the common connection provides and is how they're connected, the manual is not very detailed and full of errors.
I would expect both meters to always measure the actual currents in either side, this occurs when operating independently and connected together externally.
The manual doesn't go in to much detail. Step 3 is actually incorrect as CH2 just beeps when knob is turned is turned in series mode, the settings are set form CH1 for both (2 outputs whatever 1 is in this mode).
I think the software is assuming that connection would only ever be connected across both as pictured in the manual, and never between either side and common. This can't be assumed. Common can't be seen in the manual picture, its under CH2 - covered by binding post.
I agree, a schematic would be helpful as it helps understand any limitations. I've not looked inside yet.
I know exactly what is common in normal double sided power supply.
I have not this model for test at this time. Manual and datasheet they are so poor that really can not say anything exatly. It need this unit for study and exercise how it works. Personally I do not accept this level of User Manuals at all. Better than nothing but just toy class. This (User Manuals, Datasheets, Service Manuals etc) is area where Siglent and many Chinese manufacturers really need develop lot of)
After trying read manual and datasheet many times I have only my personal opinion how I think it works.
(I leave CH3 out from my answer)
There 2 independent floating power supply. Both 0-30V.
If need double sided power supply with separate adjustments for both sides (-|0|+) ) you can do it simply externally. (connect CH1 + to CH2 - and this is your "common" (0)) There you can separately adjust negative and positive side voltage and current limit.
Manual: "In the series mode, CH1 and CH2 are linked internally into
one channel....and the
output voltage value is twice compared with that of single channel."
It do not talk anything about double sided (-|0|+).
Data sheet: Series and parallel function allows
two channel combined into one output....
If need single output (one channel) 0~60V power supply you use "series" mode. You connect load to between CH1 - and CH2 + terminals. Control is CH1.
This single supply output rating is 0~60V/0~3A
(also this can do externally with independent mode but now you need use both channels adjustments)
If need single output 0~30V but more than 3A current you use "parallel" mode. You connect load to between CH1 - and CH1 + terminals. Control is CH1.
This single supply output rating is 0~30V/0~6A
In manual there is note about CC in this mode.
I hope Siglent write acceptable level User Manual so that alone with manual you know exatly what it do and what not and every exeptions and every limit in all things and using combinations. Now it need this equipment for study how it work.
How user manuals need write. There is lot of examples and materials for free study, free available. Example older
HP(/Agilent/Keyshit) and older other well known high level brands power supplies User manuals and Service Manuals and Programming manuals.
If manuals are shit:
they are perhaps first contact with potential customer who first try read carefully manuals and datasheets before make decision to buy. Do you know what happend to peoples if in first meeting first minutes something fails totally. This can not repair never. It is game over. If people see shit manual he put "shit stamp" to this equipment and go to some other.
But even more bad. If people read datasheets and manuals and then buy. If he after then find that manuals have been bullshit and datasheets have not been datasheet but they have been ads what only have told nice things giving wrong imagine about functions and after this disappoint, he feels scammed and you do not have so much value you can get this customer back. Also poor rating is spreading everywhere.
If some give good rating, perhaps he think only alone with silence or just someone may heard it.
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