Description Ever wondered how much your Arduino Board or Raspberry Pi board takes current Graphic LCD backlit Display USB Current Voltage Power and Capacity Meter measures current, voltage, power and capacity in a very convenient form factor device. This Current Voltage Power and Capacity Meter is also known as USB Doctor. Features Measures Voltage (V), Current (mA), Power (Wh), Capacity (mAH), Temperature (C) and Load Resistance (Ohms 0-999.99 ohms) Retains last parameters in memory even if you turn off the power Wide input voltage Range (3 to 30V) Wide Input voltage Range (0 to 5.1A) Simultaneous Display of all parameter Key button clears memory and switches screens that display different data Precission current, voltage, capacity and power measurement. USB Communication: USB 1.0, USB 2.0 Fully compliant, USB 3.0 Partial compliant please see note Built-in Temperature Measurement Buzzer for warnings and indication [!] USB 3.0 Note At USB 3.0 maximum data rate was found ~37 Mega-Bytes-per-seconds on a Intel Core i3 128GB SSD and DDR4 spcification machine. However without this Tester, the data rate on same machine was found 105 Mega-Bytes-per-seconds – Test performed at Art of Circuits Technical Specifications Input Voltage: 3V – 30V Input current : 0 – 5.1A ` Cumulative capacity range: 0-99999 mah precision: 0.001 Ah Charge accumulation scope: 0-999999 MWH precision: 0.001 Wh Cumulative power range: 0-299.999W precision: 0.001W Timing the maximum range: 0-999 hours 59 minute 59 seconds precision: 1 second Parameters that you can test: Voltage of battery. Current of battery, discharge capacity of battery,Quantity of electric charge,power of battery,timing. Communication function: Yes Parameters adjusting function :Yes. Equipment for parameters adjustment: One electronic load,one constant current source. Voltage of constant current source should be set to 8.5V There are 3A, 2A, 1A and 0.3A models for current adjusting. Here is a example for 3A: When you set electronic load at 3A model, the current will be adjusted step by step. It will cost you about 10 seconds and you can see the result changing procedure in the LCD screen. When you see the 3A result shown in LCD screen, the adjustment process is finished. You can shut off the electronic load and the parameters will be saved automatically. Over voltage or under voltage : Over voltage or under voltage, LCD screen displays a warning symbol and issue rapid beep beep sound. Usage Clean the data : Push the button until the parameters changed to next sets of parameters. Then release the button. Then the next sets of parameters will be started and they will start from zero. Turn on mode l: The LCD screen will show all parameters within 1s when you connect power supply by Micro USB or male plug of USB with wire.(It is to check whether the LCD screen is good or not).Then you can see the parameters used last time(capacitor and which set of parameters). You also can see the current voltage, current and over voltage or under voltage. Please see following illustration. USB output port can be connected to a data line, a discharge resistor or the like cable devic comprising a data communication function, the data does not affect the data transmission line. Test specifications, voltage can not exceed 30V, current can not exceed 5.1A. Note:When the voltage is lower than 3V on the instrument display No display screen or higher than 22V,LCD screen displays a warning symbol and issue rapid beep beep sound, it does not affect the use.   Applications Can easily measure the USB ( PC USB, cell phone charger, car charger , mobile power , etc. ) port and device operating current and the output voltage charge-discharge capacity. Measure performance of devices Measure the performance of the USB chargers Package includes 1x Graphic Display USB Current Voltage Power and Capacity Meter   Art of Circuits is Pakistan Popular store that brings Innovative Embedded Modules, Sensors and other Electronics  products in Pakistan. Join Art of Circuits on Facebook Follow Art of Circuits on Twitter