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Siglent SPD3303D review

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Marblefish:
Hi,
My first post - just discovering electronics as a hobby after a break of a few decades. I am in the process of selecting a bench power supply as an upgrade to my current ‘ hobbled together supply’ as a birthday present to myself. After reading the excellent review by Frank, I wondered if when setting the unit up to provide a positive & negative supply (20v) is it best to use the Siglent in Independent mode & link Ch1- to Ch2+ together and use the ground as 0v rail or in Series mode with ground as 0v? I was thinking that in Independent mode you only have to adjust one channel & the 2nd channel follows accordingly.

Many thanks.

Zbig:
It's the other way round: you only have to adjust the voltage on one channel while in Series mode. In Independent mode, the channels are... well, independent ;) I'd personally use Series mode in this scenario as it saves you from using a shorting bar and ensures both channels are sharing the load equally (and your 0V indeed sits in the middle). Also, trying to keep both channels' voltages in sync manually could turn to be a bit tedious (same knob shared by two channels).

monz:
This is correct, in series mode it automatically connects + on channel 1 to - on channel 2 (becomes the common connection) and the voltage and current adjustment track each other.  I was disappointed to find that in series mode the channel 2 current is not measured. The current reading on channel 1 is simply duplicated to channel 2. So if I have a load between common and channel 1 - it displays current (and shows the same reading for channel 2, which has nothing connected) and if I connect a load from common to channel 2 + it displays no current. I don't know if this is a software bug or hardware limitation. I would think the relay inside just connects the two channels together just as if this was done externally with a jumper. Or maybe they incorrectly assumed in the software a load would only be across both with com never connected.

This and the bug where it saves the power on count when presets are saved make me wonder about the quality of the firmware.

Other than that annoyance, it has been very good, there have been no issues and the output voltage is very accurate. It's also not as deep as many and takes up less room on the shelf.

FrankBuss:
I think it is a feature, because the series mode is intended for a higher output voltage, so it makes sense to show the same current.

monz:
This would make sense when connecting across both supplies in series for situations where higher voltages are needed since the current would be the same, it should then show double the voltage and only display the total.

But since a common connection is provided (labeled com along the gray line showing the series output connections below binding posts), this can't be assumed since there would be different loads between the negative side and ground and the positive side and ground as shown in the photos.

It seems like an incorrect assumption is being made in the software. Maybe I'm wrong, just doesn't seem right. I would think pressing the series button simply puts the two in series via a relay, the same as connecting them internally, then sets the software so the control tracks.

neg-- :bullshit: -- com --  :bullshit: -- pos, couldn't resist using the meter thing ;)!

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