ET5407A+ Programmable DC Electronic Load teardown

• ET5407A+ Programmable DC Electronic Load teardown
  Posted by hve on 19 Mar, 2024 13:15
• 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.
   
  

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• #1 Reply
  Posted by adinsen on 28 Mar, 2024 12:39
• 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?
• #2 Reply
  Posted by tppc on 30 Mar, 2024 08:42
• 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.