| Products > Test Equipment |
| ET5410 Electronic Load mod: add external sense |
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| cybermaus:
@gico750 it is only needed if you want to ignore any voltage drop that your connection leads may give. Consider the example case: 12V power supply that you want how far the voltage drops between 0-3 Amperes If your test wires are thin, your test wires themselves may drop .5V Or more So you measure 11.5V at 3A load, thinking that your power supply is loosing voltage quickly. But the power supply may be keeping up nicely, and it is your wires. By moving the voltage measure point to the power supply, you eliminate this problem Look into generic explanations of 4-wire voltage measurement and kelvin clamps. Alternative and easier solution would be to ensure you always use thick wires, and not cheap china ones. If you want to measure up to 3Amp, use wires that are rated to 30Amps. Or something like that. |
| gico750:
thanks for the answer, yesterday the tool arrived and I would like to make this modification, so just detach the thin wires and put them thicker in the center of the panel with two bushings, but then how are they used? Sorry but I'm not very experienced. |
| gico750:
ok, i read the 4 terminal measurement and saw the kelvin tweezers .... Now he wants to understand only the diodes you put to protect the opamp. Are they just those two I see in the picture? Thank you |
| cybermaus:
--- Quote from: gico750 on August 25, 2021, 07:41:29 am ---just detach the thin wires and put them thicker in the center of the panel with two bushings --- End quote --- They do not even need to be thicker. The sense wires can be thin. --- Quote from: gico750 on August 25, 2021, 12:02:03 pm ---ok, i read the 4 terminal measurement and saw the kelvin tweezers .... Now he wants to understand only the diodes you put to protect the opamp. Are they just those two I see in the picture? Thank you --- End quote --- Yes, only those two diodes in the picture. I am not even absolutely sure it is needed, but I feel it is safer. |
| ceut:
Hello ! I have made a small mod for the (too loud) fan. I use a lot 40°C Thermal Switch (Normally Open) for many devices which have too loud fan (I don't know the real name of this component). So the Fan is completely shutted down when the temperature is under 40°C :-+ The mod is simple, only take time to find how to put the sensor... Here are somes photos :) Also, you will see a "Fan Error" icon on the top of the screen, which disappears when the Thermal switch is on: it is a good feature ;D I have checked with my lab powersupply at 20V/3A: no problem it works well 8) (Siglent SPD3303) Edit: I think I will buy a Noctua 80mm fan (or something like this) to replace it, too loud for me when it is active. Edit2: Here is the no-name fan reference, 12V/0.35A/ 4500rpm :o |
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