Features:1.Operating Voltage: 13.5-30V.2.Input Frequency Range: 0-1KHz.3.Output voltage fine tuning 4.Adjusting potentiometer can calibrate the relationships between frequency and voltage. 5.Signal input port adopts optocoupler isolation, it guarantees good anti-interference capacity 6.F/V converter module, response time is 0.3-0.5s. If you want to adjust frequency by a large margin, it needs some time to response 7.Working temperature:-25~85℃ Interface definition: VCC: operating power supply GND: power ground F: input frequency pulse signal GND: input ground VOUT: output corresponding voltage GND: output ground Note: 1.Input different frequency, output correspond to certain voltage. 2.Input pulse level can be 5V, 12V, 24V, you do not have to serial connect resistor. But if you input signal frequency, the time should be more than 0.5s. 3.If you want to use it with PLC, it supports NPN. Please make sure that there is GND wire. 4.If you want to use it with encoder, it requires the encoder constant speed rotating for more than 0.5s. Operating Introduction: 1.Connect the operating voltage with VCC and GND, and they cannot be reversely connected 2.Connect frequency pulse signal with F, then there be corresponding voltage output in the VOUT port Input and output corresponding relationship: 100Hz=1V; 1KHz=10V 3.The module precision is 1%, and it cannot be applied to fields which has high demanding of precision colour:blue Material:PCB size:32.6x34mm Package Contents: 6 x ARM -M0 STM32F051C8T6 STM32 Core Board. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.