No-source two-wire 4-20mA current loop, compatible with 2, 3, and 4 wire systems. Features 9 programmable outputs for dynamic environment testing, with each segment configurable for run time, A current, and B current. Digital encoder adjustment provides stable performance unaffected by temperature or humidity changes. Supports positive and negative connections; safe for two-wire system wiring without risk of damaging the meter. High precision and excellent linearity with output accuracy of 0.5% and display accuracy of 0.01%. Offers coarse and fine adjustment modes for fast and accurate calibration. Output range可set to 4-20mA (control device) or 3-21mA (debug signal). LCD display with backlight shows actual current, 100.0%, or 50.0Hz. Linear output is calibratable. Can be configured for automatic or manual output mode. Supports 2-9 quick adjustment output points. Built with low-power chips for ultra-low consumption, no heat generation, and stable output. Durable plastic housing, compact design for easy installation.System Operation: Parameter Setting (Rotate clockwise to increase, rotate counterclockwise to decrease, press knob to confirm): 1. Press and hold knob for 2 seconds to enter parameter setting mode. Display shows "F001". Press "Confirm" to set value. Value = 0 for coarse tuning, =1 for fine tuning. Press "Confirm" to save. 2. While viewing parameter number "FXXX", use rotation to modify the parameter number. To access F002, input password "+ - - +". To access F100, input password "+ - + -". To access F200, input password "- + - +".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 Item: 1 piece Color: As shown Material: Plastic Size: 79.5x42.2x24mm / 3.13x1.66x0.94 inch Package Contents: 1 x Signal Generator Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3cm.