Yesterday my new DL3021A arrived.
The first thing i noticed was that when i am just enabling the input it constantly show a current of around 2.2 mA even when not connected to any source. And in 4A-Mode where the spec of the current setting would allow a maximum of 2mA.
Ugh... A further look into the spec tells me that this value is within spec because - other than other loads - this device only has one current readback range. Other devices are using at least similar or even the same setting and readback-ranges. It's accuracy is specified with +-(0.05%+0.05%FS). FS is 40A, so up to 20 mA without any load would still be in spec.
WTF... why is there no 0 to 4A readback range with an accuracy similar to the input mode of the device?
During testing i struggled in the constant resistance mode. I connected a 1.5V battery, switched to CR Mode, pressed 15, then "kOhm". The display showed "15 kOhm". After enabling, the device pulled around 70 mA from the Battery (and showed 15 Ohm in it's display).
The last time i got a new rigol device - function generator DG1062z - i had to exchange the device multiple times until i go a satisfying one. The first one had a hardware-failure, the second one was out of spec in frequency accuracy, the third one was acceptable (but there still was an software error when using the external 10Mhz-source after powering off the device).
I am really not shure if i will keep this rigol load. Maybe Maynuo would be more satisfying?
What are the disadvantages of Maynuo?