Not all usb ports on your laptop or desktop are the same.
Usb voltage measuring device.
Makerhawk usb 3 0 tester usb power meter 3 7 30v 0 4a voltage tester multimeter usb current meter tester ips color display voltmeter ammeter usb charger tester at34 1pcs 4 5 out of 5 stars 213 11 59 11.
Temperature and voltage measurement device with 8 channels supports 4 sensor types including.
It comes with a bright led segment display.
With newer systems you d be hard put to find a usb port that isn t usb 3 0 however you will still have a composite port which likely doubles as a charging port and is what you should use to connect a usb 2 0 printer the charging port on your system is the one that will charge a device even if your laptop is off and will probably.
A lot of the time a usb a cable is plugged into the power source and the other end of the cable will be one that matches the device using the power.
It can function with any usb a port that has the ability to deliver power.
Features enabled to measure usb devices at no load and over load condition also for usb terminals testing.
Analog voltage output device with 4 high drive channels 8 digital i o and 1 counter input.
Thermocouple rtd thermistor semiconductor 24 bit resolution 2 s s ch sample rate 8 digital i o and 1 counter input.
Analog voltage output current device with 16 channels 8 digital i o and 1 counter input.
This device can measure voltage and current consumption of the devices like mobile tablets etc.
It accurately and reliably measures and displays the usb port voltage current capacity energy and resistance simultaneously.
A very useful device for usb port checking and charger use it you can check if the usb port is active or if a battery of external device is charge or if current is not exceeding limits.
Once a device has enumerated itself on the port then it can negotiate for up to 500ma from the host controller.
Just insert the tester between the power source and the cable and you will be able to see the voltage and amperage draw and some other characteristics.
