Got a USB power supply, wall plug, how do I check amps and V?
I would hate to run too much power to something and blow it. Especially phone. Listed at 1 amp, I believe.
Also got ML-102, V5 and would like to check it & charge phone with it.
Link to USB power supply?
Quality USB power supplies should not be damaged if you try to pull more current then it can provide. HKJ did see one fail though so it wouldn’t hurt to avoid connecting any high amp devices.
Checking volts & amps requires a DMM or one of those usb volts / amp monitors.
Tried to put leads in usb , not enough room. Which is positive & neg?
I have one of these, it is brilliant.
Simple and practical; Small size, convenient to carry, no external power and other accessory equipment needed, plug and play; Can detect any USB output of power supply, charger, computer, car charger and mobile power, easy to measure out no-load voltage, loading voltage and devices working current of USB output, and to judge whether the performance of the charger and charging cable meet the requirements; Simple to operate; Suitable for 3~7.5V / 0~2.5A, 3 digits digital USB voltage and current alternate display, the result clear, great for factory, laboratory and normal users.
| Brand | NA |
| Model | USB-AV |
| Quantity | 1 |
| Color | Translucent blue + silver |
| Material | ABS |
| Features | Detection range: Voltage: 3~7.5V; Current: 0~2.5A; Error: Voltage: less than +/- 1% Current :less than 2% |
| Application | Compact and easy to carry, no additional power supply, plug and play; It can easily measure the output voltage of the USB port and the device operating current or load voltage |
| Packing List | 1 x USB mobile power current detector |
Yup….these work great…I need more than 1! (they can be found all over the place)
The two outer pins are voltage. Check the usb specifications for which is which.