1. passive two-wire 4-20MA current loop, the wiring is fully compatible with 2, 3, 4 wire system 2. 0.01 precision, liquid crystal display, encoder knob, terminal block is not positive or negative 3. can set the coarse and fine adjustment mode, the number of turns can be set 4. can set the output range: 4-20MA (control equipment) / 3-21MA (debug signal) 5. can be set display mode: actual current / 100.0% / 50.0HZ linear output, can be calibrated can be set to automatically store the output value programmable automatic curve output cycle 1-9 segment can set 2-9 points to quickly adjust the output, the knob directly calls these currents 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 Colour:As Shown Material:plastic Package Contents: 1 * Signal Generator 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.