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| ET5410 Electronic Load mod: add external sense |
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| DaneLaw:
--- Quote from: andyB2022 on May 29, 2023, 06:55:34 pm ---Yeah, no response so far. --- End quote --- If you do not hear back through email, then try the telephone (it's quite cheap these phonecalls to CN nowadays) and have your details ready, like serial number etc, and emphasize that the phone support starts a case on your behalf, and ask for that case/journal-number, so you have something tangible to build on, if you have to call back, as otherwise, you can risk they just sing you a tune, on how they "love you long time, & will get back to you" and never do, and you have to start over and explain it all again to the next phone support worker. |
| andobovsayvkub:
Hello. I just made a connection for 4 wires on 5410A+. I cut the traces and simply added a 22 ohm resistor between +V and +SENSE. Setting more then 20 Ohm will lead to an measurement error with 2-wires, and low values will cause voltage drop with 4-wires. This made it possible to use both a 2-wire connection and a 4-wire connection without adding a switch. The standard behavior of the device has not changed. Yes, it is possible that a voltage error may occur with a 2-wire connection but no more than 1 in the last digit on the screen. Tested in the range of 5-60V, 0-25A. And it still measures absolutely accurately with 4-wires connection. Also thinking of diode protection, but later. part of original new one appearance And one more moment. The motherboards have been replaced due to a transistor that burned out on the first day. And I can't remember if the "software sense" function worked correctly when measuring the resistance of the wires connected to the battery or to other weak source. The line resistance measurements are correct with a laboratory power supply. But when I try to measure the line resistance with the battery connected, I get incorrect data as the source voltage has a drawdown. Is it like this for everyone or is the new board also defective? That was my the main reason to transfer it to 4-wires schema. |
| ceut:
--- Quote from: andobovsayvkub on March 16, 2024, 11:35:24 pm ---Hello. I just made a connection for 4 wires on 5410A+. I cut the traces and simply added a 22 ohm resistor between +V and +SENSE. Setting more then 20 Ohm will lead to an measurement error with 2-wires, and low values will cause voltage drop with 4-wires. --- End quote --- Hello, So your mod does not need any switch to choose between 2-wires or 4-wires ? I see this is a newer model than mine. I have modded mine today, after so many years :-DD (fan mod previously) Thanks to @cybermaus mod ;) The mod was not really hard, and the 3 holes positions were already spotted on the back. I don't know why I have not made this before |O Here are some photos I have made, for my original ET5410 :-+ |
| klausES:
Hello, just found yours here in search of a load in this price range and last but not least, i would like (also in optical) the ET5410A+ better than a KP184 I have already read a lot about him but did not find a menu function for calibrating, e.g. with the KP184. Have I just haven't read it or is there a calibrating not possibility of the ET5410A+ ? |
| cybermaus:
I'll have a look later, busy now. But honestly, I suspect not, the menu is not all that good. Though, mine is old now, there has bound to be some newer version. All in all, the device works, and I use it quite often, but I am only expecting 2 digits of precision. The external sense however is still very important. You really need to either have HUGE cables and clamps, or correct for the cables voltage drop. |
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