Hi all,
I recently bought a DL3021 Rigol DC electronic load, for tests in low consumption.
I also purchased the HIRES-DL3 option to access more accurate display "High Measurement Resolution Option"
I have several devices of the brand, and I was confident in this new purchase
After a few tries, I immediately noticed something that seemed to me abnormal.
In static CC mode, for an I of 10mA of load, my power supply and my dmm displays 20mA of real current. (see photo2)
We are here far from the 0.05% + 0.05% FS specification.
In my case, we should not exceed 0.010x0.05% + 0.05% x4A = 2mA error.
I wanted to investigate the problem by checking that the voltage raised in the DL3021 has no influence in this offset, but in "CC" mode, the voltage has no influence on the regulation of the current I. ( tests done with EXT sense on)
I noticed that the DL3021, also sinked 10mA when it was not loading "OFF mode". (see photo1 on my power supply and my dmm)
I do not know if there is a relation between this two measurements states and I asked the question to Rigol and I do not have a response from them yet.
Is my concern specific to my machine, is it someone who owns this device could tell me if he is experiencing the same problem as me. ?
I am for the first time disappointed with the brand and I hope to find a possible way of solution. Otherwise I think I will return the device and turn to another brand ..
Case to follow......