Products > Test Equipment
Just bought a GW-Instek GPP-4323 power supply-First impressions etc.
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nctnico:
Given the small offset I strongly doubt you can make it any better. Just look at how small it is compared to the full range. IOW: don't mess with it; you'll likely make it worse.
julian1:
32V/3A is quite a lot. Does it have a switching pre-regulator?
tautech:

--- Quote from: julian1 on October 17, 2021, 08:23:28 pm ---32V/3A is quite a lot.

--- End quote ---
Hardly, plenty of linear PSU's have such specs.
Martin.M:
set it to:

12V  5mA to understand why the question for this small offsets is interesting  :)
We have to add it to the setting. I have payed this 800€ to have a trustful current control in small areas.
Otherwise any chinese PSU for 120,- can do the job also
mawyatt:

--- Quote from: Martin.M on October 17, 2021, 09:08:32 pm ---set it to:

12V  5mA to understand why the question for this small offsets is interesting  :)
We have to add it to the setting. I have payed this 800€ to have a trustful current control in small areas.
Otherwise any chinese PSU for 120,- can do the job also

--- End quote ---

Exactly!! Lots of folks that haven't worked in research labs with advanced SOTA semiconductors that are highly susceptible to damage by just slight over voltage or over current, don't appreciate having a precise voltage and current limit. Almost 50 years ago we lost well over $20K of chips because of a lab supply slight overshoot on start up, that's why I won't consider Korad (think a Rigol also had an overshoot issue), I'll let others play Russian Roulette :o

I hosed up a SDP3303X-E by not following the calibration procedure and created a current offset that now I can't remove...all my fault |O
With this offset I'm reluctant to use this supply now for any precision work, since I know from experience it will come back and bite me sooner or later. Just now, I've got ~$3K of chips sitting on the other side of the supplies I'm using, so very careful with setting a reliable and accurate current limit, as well as voltage.

The SDP3303X-E are good (after augmentation), and I can rely on a few ma for current limit if required, but suspect the GPPs are better.

Wish someone would figure out how to remove this current offset on the one SDP3303X-E we have, the other 2 are fine. However, for now it's not going to see any serious use because of the offset.

Best,
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