100% brand new and high quality Features: No-source two-wire 4-20mA current loop, wiring compatible with 2, 3, 4 wire system 9 programmable output (can simulate the actual environment of dynamic testing, each section can be set up t running time /A current /b current). Digital rotary encoder adjustment (the use of potentiometer, easily affected by temperature and humidity, the resistance value will change). Can be connected to the positive and negative (two-wire system, no matter how wiring, can work, will not burn meter). High precision, good linearity (Output accuracy:0.5;Display accuracy:0.01) Coarse and fine adjustment modes can be set for quick and accurate adjustment Output range can be set: 4-20mA (control device) / 3-21mA (debug signal) Display mode: Actual current/100.0%/50.0Hz, LCD (with backlight). Linear output, calibratable Can be set to automatically store output values: automatic / manual 2-9 quick adjustment output points can be set Imported chips, ultra-low power consumption, no heat, more stable output. The shell is beautiful and easy to install. System operation: Parameter Settings:(Rotate one grid clockwise is "+" Rotate one grid counter-clockwise is "-", Press the knob. is"Confirm") 1. Press and hold the knob for 2 seconds to enter the parameter setting, Display parameter number "F001", Then press "Confirm ", to Set the value of parameter "F001", =0 is coarse tuning; =1 Fine tuning; Then press "Confirm" to save its value. 2. When the parameter number "FXXX" is displayed, "+" "-" Rotation modification parameter number; Enter the password first "+ - - +", To enter the F002 parameter; Enter the password first "+ - + -", To enter the F100 parameter; Enter the password first "- + - +", To enter the F200 parameter. Specification: Power supply voltage: 15V-30V Output range: 4-20mA/3-21mA Display mode: Real Current / 0-100.0%/ 0-50.0Hz Sampling resistance: Less than 500 ohms Output accuracy: 0.5 Display accuracy: 0.01 Shell material: ABS Dimensions: 79.5x42.2x24mm/3.13x1.66x0.94inch Color: Black Quantity: 1 Pc Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 3.If you need PDF version of the manual, please contact us. Package includes: 1 x Current Loop Signal Generator 1 x User Manual (English)