Products > Test Equipment
ET5410 Electronic Load mod: add external sense
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Wintel:

--- Quote from: cybermaus on September 26, 2020, 09:02:52 pm ---Anyway, I did do the IGBT test again.
So Load is set as a 4 Ohm resistor, and a MOSFET is drawing current through it, driven by a 20KHz PWM signal.

And indeed, it is doing pretty well emulating this resistor. Maybe it is because it does not need to react, just stable keep its internals set to the emulated 4 ohm, regardless of the PWM state.
But initially when I tested this, I wondered this sort of setup would work, and it does. Even at 20KHz it shows a fairly square amp use.
Note how the amp does jump from 0Ampt to almost 3 Amp (12V over 4 Ohm) but the load display calculates the average current

Yellow is current drawn. (almost 3 Amp peak))
Blue is voltage over MOSFET, connected to Load Negative (12V then open).

--- End quote ---
cybermaus, have you try to test the Battery Discharge feature and set to CR "Constant Resistance", ie. connect a battery and set the Battery Discharge feature CR to 5 Ohm or 10 Ohm,  Does it work ?

Because many users report that Battery Test doesn't work with CR, when selected constant resistance nothing happened, only when constant current was selected did it start to discharge.
cybermaus:

--- Quote from: Wintel on September 28, 2020, 09:42:03 pm ---cybermaus, have you try to test the Battery Discharge feature and set to CR "Constant Resistance", ie. connect a battery and set the Battery Discharge feature CR to 5 Ohm or 10 Ohm,  Does it work ?

Because many users report that Battery Test doesn't work with CR, when selected constant resistance nothing happened, only when constant current was selected did it start to discharge.

--- End quote ---

I checked, and indeed, I am not able to get the CR submode of the Battery test to work. CC works OK, but CR does not.
I tried several cutoff voltages and resistance values, but it just is stuck to about 7~8mA. And no, this was not the value still set for the unused CC mode, those were set way higher.

So it seems this really is a failure of the device.
Wintel:

--- Quote from: cybermaus on September 29, 2020, 08:25:43 am ---
--- Quote from: Wintel on September 28, 2020, 09:42:03 pm ---cybermaus, have you try to test the Battery Discharge feature and set to CR "Constant Resistance", ie. connect a battery and set the Battery Discharge feature CR to 5 Ohm or 10 Ohm,  Does it work ?

Because many users report that Battery Test doesn't work with CR, when selected constant resistance nothing happened, only when constant current was selected did it start to discharge.

--- End quote ---

I checked, and indeed, I am not able to get the CR submode of the Battery test to work. CC works OK, but CR does not.
I tried several cutoff voltages and resistance values, but it just is stuck to about 7~8mA. And no, this was not the value still set for the unused CC mode, those were set way higher.

So it seems this really is a failure of the device.

--- End quote ---

What is the hardware and firmware version of the ET5410?
cybermaus:
Purchased January 2020
Software: V1.0.1942.024
Hardware: V1.10.1946.002
 
Wintel:

--- Quote from: cybermaus on September 29, 2020, 01:43:21 pm ---Purchased January 2020
Software: V1.0.1942.024
Hardware: V1.10.1946.002

--- End quote ---

Maybe there is a bug of firmware, or will be fixed after firmware update (maybe?!)

Is there any new firmware for ET5410?
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