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Trying to research a little found this guy a while back complaining about input capacitance of the Array 3711A:
https://www.eevblog.com/forum/testgear/digital-load-recommendations/msg1367620/#msg1367620
I don't understand how this could be. How could you do transients and pulses? I realize it's a cheaper model. Any comments?
The 3723A has 2.2uF in series with 3 ohms across the terminals (measured with an LCR meter; I didn't open the unit). It hasn't gotten in my way for anything I needed. However, if for example, you were doing CV transients with low load currents it could be a factor.
The 150uF forrestc is mentioning in the 3711A is approaching two orders of magnitude larger. I would probably have his same complaints in scenarios with rapidly changing voltages across the input terminals. If you were doing purely current transients/pulses with little to no change in voltage I would think the input capacitor would not be a major factor.
In that thread they are also saying the 3711A is a rebadge. I don't think the 3723A is, or at least I've never seen one branded differently. It seems to be a new/different design than the 371x series.
Also looking at the manual for the 372x series I have a question. What happens on your 350W model if you setup say 20A and put in 36V=720W. I think it says it current limits after a time period? What does that mean exactly? Can it handle higher watts for a short time?
A quick test with a 60V 9A supply shows that it will sustain 369W for at least 3 minutes (that's how long I waited), and anything at or above 370W for 5 seconds with current limiting to keep it under 410W. After 5 seconds the overload protection turns off the input and needs to be manually reset.
But I should add this is hardly an exhaustive test and there may be other edge cases on how it decides to do the protection.