Sunyuan has successfully developed new series products ISO-U-P-F and ISO-A-P-F, the digital impulse frequency signal transmitter in a DIN package. The module can convert DC voltage (0-5V/1-5V/0-10VDC) or current (0-20mA/4-20mA) into digital impulse frequency signal (0-5KHz/0-10KHz/1-5KHz) typically, and is widely used in the application of Frequency Modulation, A/D Conversion, Digital Voltage Meters and Remote Control Equipments. The main features are as high linearity in whole process (nonlinearity < 0.1%) and accuracy:0. 1, 0.2. The modules have been fully calibrated and tested in house and customer can use it directly.