My some old tests was "garbage" due to problem on the SPD3303S control board. Also there was small problem in IRF540 based power switch unit used in test.
My "demo" SPD3303S is repaired and it have now new control board. (long delay to repair it in my workshop was just my own reason, not Siglent. (just lack of time for working with this, and because this is my demo unit what is not used for lab work and failure was not "fatal class")
In all next tests HW version is 1.2. (also on PCB, printed version new) And FW version 1.01.01.06R2.
First 2 images. Both power supplies with same settings. 20V and current limit 3A
Load. Continuous 1A and load step to 2A, step duration 300us. Oscilloscope CH1 show switch control signal from Siglent SDG5082 to switch unit what control PSU load. Load is set of selectable power resistors)
Switching period is 2ms. 1A 1.7ms and 0.3ms 2A. It need note that switch turn on and off edges are quite fast (enough for this purpose)
(just note oscilloscope scale. 100mV/div and Voltage is 20VDC (oscilloscope input AC coupled)
Result is good.
This is Agilent 6632B 20V 5V very good quality linear system power supply.
Next image. Short circuit. (not "copper rod short" but short using power switch unit (it use IRF540 as switch.)
CH1 is switch control signal from Siglent SDG5082
SPD3303S settings: 20V and 3A.
Next three images: SPD3303S.Channel output tur ON with different voltages for look if there is any voltage where is gives some peak. (it is good to know that there is 4 internal primary voltage levels before output regulation stages. It is nessessary for reduce power dissipation with different voltages and load currents. So it steps to desired transsformer tap with different output voltages.
No any noticeable or worrying voltage peaks during the run-up ramp. Just smooth turn on. Next. Voltage set for 32V and current limit 3.0A
Connected different loads ("0" ohm, 0.5 ohm to 10 ohm) to output using switch module.
Also there is trace with output off and output continuously on. (just for ref)
This show how it switch from CV mode to CC mode and recover to CV.
Next two images:
Recovery from 1ms output short with different current limits. (CV --> Shorted (CC) --> recover back to CV)
1. 0.6A to 3.0A with 32V
2. 0.1A to 1A with 32V and 16V
Then next CH1 and 2 Series connected mode (full 64V)
From off to ON
Next four images about CH3.
Short circuit recovery, No Load
Short Circuit recovery, 10 ohm Load (@5V 0.5A)
CH3 turn ON with 10 ohm load
CH3 turn ON with NO load. (exept scope probe)