It can be used to measure the luminous intensity, forward voltage, reverse current of each luminous dot in all kinds of LED luminous dotmatrix.
能测试各种LED发光矩阵每个发光元的发光强度，正向压降和反向电流。
2
The LED(light-emitting diode) dotmatrix screen is constitute of computer, data transfer unit and display unit.
大型LED（发光二极管）显示屏由计算机、数据转换单元与显示单元组成。
3
It USES PC to transform Chinese character interior code in the sentence to dotmatrix display data and send them to LED display screen through serial device.