Products > Test Equipment
Lab Power Supply Turn ON and OFF Characteristics
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mhsprang:

--- Quote from: thm_w on October 12, 2024, 12:29:54 am ---
--- Quote from: radar_macgyver on October 12, 2024, 12:08:52 am ---Here are some plots from an Agilent U8001A. Load is 47 ohm non-inductive. MXO4 with RT-ZP11 probes. I set the voltage to 15V, with various current limits.
--- End quote ---

But did you test the settings as specified in the OP... 8V and 40mA?

--- End quote ---
Thas it indeed important as on the R&S NGE 103 the problem disappears above 150 mA. This behaviour is all about low currents. My tests were all done at 10 mA, when testing (and frying) some LEDs.
radar_macgyver:

--- Quote from: thm_w on October 12, 2024, 12:29:54 am ---But did you test the settings as specified in the OP... 8V and 40mA?

--- End quote ---
Ah crap, will re-do with those settings, that was at work so it'll be a couple of days. In the meantime, here's the results from my home bench, with a TTi MX100TP and a Siglent SDS2104X Plus. The 40mA test shows an overshoot, and interestingly, the overshoot behavior at higher current limits starts to show a pattern, its like the control loop stays in CV mode till the voltage reaches 2.5V before it switches to CC mode. I tried various ranges supported and they all showed the same behavior (this supply lets you internally combine its three outputs to create several ranges). No difference between the output channels either.
AVGresponding:
HP 6633B here. Quite a bit slower to regulate than others:

AndyC_772:
I carried out quite a detailed investigation of this effect on the 6632B some years ago...

https://www.eevblog.com/forum/beginners/first-bench-supply-ripplenoise-problems/msg141522/#msg141522
tautech:
Siglent SPS5042X < 40V 60A capable.
Set to 8V 40mA > 56 Ohm 10W < first to hand.....

Screenshots in this order:
Small step and some ripple at ON.
Clean ramp down at off.
Close in analysis of the power ON step.
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