No-source two-wire 4-20mA current loop, wiring for 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).<br> Digital rotary encoder adjustment (the use of potentiometer, easily affected by temperature and humidity, the resistance value will change).<br> 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)<br> 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)<br> Display mode: Actual current/100.0%/50.0Hz, LCD (with backlight).<br> Linear output, calibratable<br> Can be set to automatically store output values:automatic / manual<br> 2-9 quick adjustment output points can be set<br> Imported chips, ultra-low power consumption, no heat, more stable output.<br> The shell is beautiful and easy to install.<br> System operatio:<br> Parameter Settings:(Rotate one grid clockwise is "+" Rotate one grid counter-clockwise is "-", Press the knob. is"Confirm")<br> 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.<br> 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.<br> Power supply voltage:15V-30V<br> Output range:4-20mA/3-21mA<br> Display mode:Real Current/0-100.0%/0-50.0Hz<br> Sampling resistance:Less than 500 ohms<br> Output accuracy:±0.5%<br> Display accuracy:0.01<br> Quantit