ET5407A+ Programmable DC Electronic Load teardown

[hve]

Hi All,
Just received my mailbag, so I thought just share with you. Please not it is not a full review.
Here are some internal pictures of the low cost ET5407A+ Programmable DC Electronic Load.

The kit is about 120 euro's including shipping.

Max Specs: 200W, 30A, 180V

Notable components:
- Powerfets  4 x IRFP250N Infineon hexfets
- CPU GD32F30x Cortex-M4 core, 512K flash, 64K ram

Did a few constant current tests: 1,2,3 Amps @ 20V and 10 amps @ 12V. All of these tests where within spec.

I noticed during first power the LCD would scew-up when operating the buttons, flickering additional segments randomly lighting up. Turned out that some screws where missing, after fixing this the LCD was stable..
Overall I am happy with the purchase.
 

[adinsen]

Thanks for your teardown and partial review. I wonder what the overall build quality is, given the lack of the two screws? Well spotted, though 
Are you planning more tests?

[tppc]

Hi there,
thanks for these pictures an information.

I was wondering if this load has any communication capabilities.
- Could you post a picture of the rear side of the instrument?
- Does the manual mention any communication protocol?

Kind Regards.

PS. I found the manual https://www.easttester-cn.com/uploads/ET5406a+ET5407a+-DC-LOAD-User-Manual-.pdf
There is indeed a USB port but the manual does not describe the communication protocol.
I should have googled before posting.