Products > Test Equipment
ET5407A+ Programmable DC Electronic Load teardown
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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.
nixxon:
I just received my ET5407A+. I purchased the instrument from Aliexpress seller, East Tester Factory Store. It seems to be the manufacturer itself. The order was placed May 1 and I received the package in Norway yesterday, after only 15 days. The free shipping must have included air shipping. I paid US$ 131.49 + national 25% VAT for Norway.

During initial tests (before reading the FM) I thought I had received a faulty unit. The load and my PSU was all over the place going min/max continously. It was all my bad. I believed that "Voltage/Current/Power Limits" was the target value for Voltage/Current/Power. But it was of course the cutout limit for the electronic load.

The high range is displaying 0.2V lower voltage than actual voltage when in the lower voltages (1-10 volts). That is actually to be expected, as the high voltage range covers voltages all the way up to 180 volts. The low range is pretty accurate (max 21 volts). The actual amps drawn are pretty accurate to the set value, according to my Fluke 83V.

The settings menu is a pain using only 7 segment display. I guess the ET5410A+ and above with a "2.8-inch TFT LCD screen with rich display contents" color display would be way easier to understand.

All in all I am happy
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