In this video I did a teardown of an Array 3711A 300W electronic load. High resolution pictures can be found at www.kerrywong.c...
Пікірлер: 22
@PapasDino5 жыл бұрын
You don't really realize how useful a electronic load is at the bench until you get one. Lots of troubleshooting done with the smaller 150W BK unit I have...sometimes I wish I had a bigger one but that's for another day! Thanks for sharing Kerry!
@KerryWongBlog5 жыл бұрын
Yeah, I agree, electronic load is very useful. I built the 1kW one so that I could test my battery banks and some beefy power supplies...
@jwrtiger3 жыл бұрын
Thank you for the video. I have the TekPower 3710A and I also got mine off of ebay. It was brand new in a sealed box from a company going out of business and for well under $200.00. it has been working fine and seems to be well designed and built. I really appreciate that your link allowed me to download the schematics. Thanks again for posting.
@buildstoys5 жыл бұрын
Enjoyed the teardown Kerry - your homemade DC load is what brought me to your channel. I own one of the cheaper imports from Ebay as well as a Secnore PSL60, both work well for what they are.
@KerryWongBlog5 жыл бұрын
Thanks! For hobby uses, those eBay ones would be fine. The PSL60 is a very nice one.
@randycarter20014 жыл бұрын
A warning for anyone using this device. The ground of the serial port is connected to the negative post of the input. If certain electrical connections fail, large currents can pass through your data cables and PC.
@zaidhussain52065 жыл бұрын
Thank you for sharing this video
@gordonwedman31795 жыл бұрын
So the input voltage and current have the same specs but one only handles half the wattage? Sounds like a software control difference. Attention hackers....
@Rhine_Labs3 жыл бұрын
Seen a Teardown of the 3710A looks identical. Wonder if its just firmware like most these low cost items.
@toastedcrumpets5 жыл бұрын
Really interesting video. Can you comment on the isolation, i.e. are the inputs separated from ground?
@KerryWongBlog5 жыл бұрын
Hi Marcus, yes the inputs are isolated from ground.
@toastedcrumpets5 жыл бұрын
@@KerryWongBlog That's really good then considering the units price. According to chat on the EEVblog, the Maynuo units have a common ground with the input and the comms, so you have to be careful plugging it into your pc and DUT!
@KeithGutierrez-yb1yx Жыл бұрын
My 3711A is about 8 years old and has developed a strange problem. The two voltages shown on the display are about 1/10 of the actual voltage. Originally, the error was time dependent (accurate when first turned on then after awhile would change to the 1/10 of actual value). Now it is permanently about 1/10 of actual voltage. The load settings (A, W, R) have tested accurate with external test equipment. It appears to be a problem with how the unit is sampling/conditioning/scaling the measured voltages. I've just pulled the schematic from your webpage so I will study. Any tips?
@CezarySiw5 жыл бұрын
it should have a sensing port. there will be a significant power loss under 30amps load...
@KerryWongBlog5 жыл бұрын
I will give it a test to see what the voltage drop along the terminal is at the maximum rated load. But given how large the connectors are and the way they are mounted I don't think the voltage drop would be significant. But I will test it out, stay tuned.
@stevebliss60565 жыл бұрын
IRF3205's ???, how do they do 360V ?
@sightcopy2 жыл бұрын
I've been wondering the same thing, Perhaps it's something to trip-up clone producers?
@movax20h4 жыл бұрын
If you look at Mininmum resolution you will see they are using 12bit ADC, not 10bit. You were looking at accuracy. Different thing, and looser than resolution. Obviously. It is mostly due to calibration, drift, noise, and components used, etc.