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Hello,
I am using a bench psu with a multimeter interrupted on the 5V+ rail to measure current consumption. My setup and connections are ok and tested with 6-7 different mcu’s (esp8266, esp32 and raspberry pi’s). All of these devices are working perfectly when i am connecting the power cable and the measurements are the same both on the multimeter and also at the psu LCD.
When i am trying to connect the Mini Ultra Pro v3 to this setup it doesn’t power on. When i am removing the multimeter from the 5V+ rail it’s working normally. Any ideas of what i should do?The 5V is from the USB power, do not feed anything to that pin. Measuring current should be on the VBAT where the limit is 4.2V like a Li-Ion/Pol battery and please use a battery to do this else if you mistakenly apply power on USB or VIN, that might kill the PSU and also the board.
I am not measuring at the 5V pin. I made the multimeter interrupt at the usb cable 5V+ rail that is connected to the micro usb cable.
I achieve to measure current when powering the device from battery. My problem is that i cannot measure current when powering the device from micro usb cable.If the voltage drop on the VUSB is too much, the board cannot be powered which depending on your multimeter burden voltage. There’s also a diode that will drop around 0.3V-0.5V (depending on current) on the board.Measure the 3V3 and also VBUS, how much is the voltages there? VBUS should be 4.4V when used with valid VUSB or VIN.
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