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Siglent SDL1000X/SDL1000X-E Electronic Load

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Tjuurko:
I tried the various capabilities of SDL1020X-E and share my impressions:

1. Everything control was carried out remotely, the screen SDL1000X is practically not used.
2. The software transformation 1020 in 1030 is successful, but after "Reset the System to the Default Settings" the "P_Protect" field is dropped by 200.000W (it has to be manually installed on 300.000W).
3. The minimum step setting step is ~0.098 mA (5A) and ~0.490 mA (30A). It was checked by the command ":SOURce:CURRent:LEVel:IMMediate <value>", <value> changed in steps 0.00001, the real measurement of the current was carried out by the SDM3065X.
4. Measurement of current and voltage (commands "MEASure:CURRent:DC?" and "MEASure:VOLTage:DC?") SDL1000X is carried out according to the scheme: Scaling (5/30A or 36/150V) -> ADC -> the average point 2^6...2^14 -> DAC (output "V Monitor" and "I Monitor").
5. The average point 2^6 ... 2^14 affects the speed: for 2^14, the time of receipt is equa is 800 ms, 2^13 - 400 ms (this is clearly visible on the outputs of "V Monitor" and "I Monitor").

Tjuurko:
SW Version ID: 1.1.1.23R2
HW Version ID: 05-04-024
Production ID: SDL1020X-E

After experiments with the Micsig CP2100A and Siglent SDL1020X-E, one feature was discovered: large current pulsations (±4%) with the frequency of ~25.5kHz in all static modes: CC, CP, CR.

Then I remembered one "mysterious" setting ("Slew_RIS" and "Slew_FAL") in the CC menu:


Results of various modes (in all modes, the current was selected at ~3A):

CP 10W


CC 3A Slew_RIS=2.500A/us and Slew_FAL=2.500A/us


CC 3A Slew_RIS=0.001A/us and Slew_FAL=0.001A/us


CR 1.139R


Is it possible to somehow get rid of these pulsations?

Joe1vm:
I guess you can see the ripple at this frequency when you connect the oscilloscope directly (in parallel) to the load...

Tjuurko:
Now I checked the work "Maynuo MN-M9812" and found a similar effect with a small input voltage.
On "Maynuo MN-M9812" this effect is much weaker.

Specially selected parameters for strengthening "pulsations" Siglent SDL1020X-E:
"CC mode" I_Range=30A V_Range=150V Current=2.500A Slew_RIS=0.015A/us Slew_FAL=0.001A/us

The measured voltage on the Siglent SDL1020X-E screen was about 0.170V
The measured current was 2.700A

Martin72:
Tell us about your setup.
Which source is used for example.

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