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 or A current or 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 percent 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) or 3-21mA (debug signal) Display mode: Actual current or 100.0 percent or 50.0Hz, LCD (with backlight). Linear output, calibratable Can be set to automatically store output values:automatic or 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 operatio: Parameter Settings:(Rotate one grid clockwise is "and" 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, "and" "-" Rotation modification parameter number Enter the password first "and - - and", To enter the F002 parameter Enter the password first "and - and -", To enter the F100 parameter Enter the password first "- and - and", To enter the F200 parameter. Power supply voltage:15V-30V Output range:4-20mA or 3-21mA Display mode:Real Current or 0-100.0 percent or 0-50.0Hz Sampling resistance:Less than 500 ohms Output accuracy:±0.5 percent Display accuracy:0.01 Quantit