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Siglent SPD3303X-E Hi-Resolution Output Unlock?

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mawyatt:
Unfortunately the factory PDF is just a text version of the Calibration procedure is the Service Manual, so this does not correct the no load current limit offset issue.

We haven't found any technique to reset the no load offset current back to 0, nothing has worked. We have another SPD3303X-E arriving this week, and will not be attempting any calibrations on this unit if we decide to enhance it to a 3303X.

So think Caution is still applicable until a means to reset the no load current limit is found.

Best,

boggis the cat:
You mention a 100 mA offset.  I noticed this part of the cal adjustment procedure:

"(1) Connect the output of the channel to be calibrated to the output of the electronic load, and set the electronic load to constant current mode, set the constant current value to 100mA."
(On page 32 of "SPD3000X-Series-Service-Manual.pdf".)

Are you sure that you're following the procedure correctly?

We have two of these instruments at work, but have not had a reason to attempt adjustment.

TheDefpom:
My experience doing this kind of cal stuff with gear is that sometimes they don’t actually use a “0” cal point, but something other than 0, it sounds like you should be loading the unit up with 100mA and then doing that part of the cal so it sets its 100mA point when it is actually supplying 100mA, and then moving on from there.

I haven’t read the cal procedure for these units, but from what you have written I am 99% sure that is what is wrong.

TheDefpom:
Ok, I am reading the service manual right now…

Shown for Ch1, change channel to Ch.2 once ch1 done.

This sets the 100mA cal point: CALibration:CURRent ch1,3,NR3 (with NR3 being the actual current present with the load set to 100mA)

This sets the 2.5A cal point: CALibration:CURRent ch1,4,NR3 (with NR3 being the actual current present with the load set to 2.5A)

It is a bit confusing in the manual where it also has a DISPLAYING calibration section too, which is basically identical apart from the ch1,3 being ch1,1 and ch1,4, being ch1,2 instead.

mawyatt:

--- Quote from: boggis the cat on July 16, 2021, 01:04:40 am ---You mention a 100 mA offset.  I noticed this part of the cal adjustment procedure:

"(1) Connect the output of the channel to be calibrated to the output of the electronic load, and set the electronic load to constant current mode, set the constant current value to 100mA."
(On page 32 of "SPD3000X-Series-Service-Manual.pdf".)

Are you sure that you're following the procedure correctly?

We have two of these instruments at work, but have not had a reason to attempt adjustment.

--- End quote ---

Yes, followed it exactly as outlined in the manual multiple times, then tried multiple variations, always with the same result the current limit or CC without any load goes into CC mode (current limit) and the CC LED turns Red indicating an current limit or overcurrent condition. We could not get the CC mode to disengage with no load until the CC setting was increased to ~100ma, which means that without any load current the CC setting must be greater than this current offset (which should be ~0 normally). If you set your load current to 50ma then you must set the 3303X to this offset current plus the load current, or 100ma offset + 50ma load or 150ma. So the cal procedure has introduced a CC offset that can't be removed by any means we've tried.


Best,

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