This Voltage and Current Singal Generator is the most commonly used electrical test instrument for electrical engineering and technical personnel when installing, debugging, overhauling and maintaining electrical equipment on site. Plug-in terminal blocks, safe and convenient wiring. 4-digit high-definition digital tube, the brightness of the screen is uniform and adjustable (1-8 brightness). aluminum cap, electroplating buttons, high quality film, battery charge indicator, power switch . Three power supply methods, external power supply, DC5V micro USB, Bulit-lithium battery (only if you choose type 1 can you have Bulit charging mode of lithium battery). As long as all the way to work, can also be connected at the same time. DC 15-30V external power supply, which can share the 24V power supply of PLC and other equipment. MicroUSB universal interface, can be connected to the power bank, charger, computer USB port and so on. < p> In the normal operation screen, save a voltage and the current value, Cilck the encoder to save, after releasing the OK button, the screen displays "...", this which means the backup is successful. Restart directly display the saved value, no need to adjust the parameters every time when you turn on the machine, which is very convenient. Easy to carry and small in size , the best choice for in-place debugging.