No-source two-wire 4-20mA current loop, compatible with 2, 3, and 4 wire systems. Features 9 programmable outputs for dynamic testing in real environments, with each segment configurable for running time, A current, and B current. Digital encoder adjustment provides stable performance unaffected by temperature or humidity changes. Can be connected to positive and negative terminals—works reliably in two-wire systems regardless of wiring configuration and will not damage 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 quick and accurate calibration. Output range is configurable: 4-20mA (for control devices) or 3-21mA (for debugging signals). Display modes include actual current, 100.0%, and 50.0Hz, with an LCD screen featuring backlight. Provides linear output that is calibratable. Supports automatic or manual mode for automatic output value settings. Equipped with 2-9 user-settable quick adjustment output points. Built-in low-power chips ensure ultra-low power consumption, no heat generation, and stable output. Durable plastic housing with a sleek design for easy installation. System Operation – Parameter Settings: (Rotate clockwise to increase "+", rotate counterclockwise to decrease "-", press knob to confirm) 1. Press and hold the knob for 2 seconds to enter parameter setting mode. The display shows parameter number "F001". Press "Confirm" to set the value of "F001": set to 0 for coarse tuning, 1 for fine tuning. Press "Confirm" to save. 2. When parameter number "FXXX" is displayed, use "+" or "-" to modify the parameter number. To access advanced parameters: - Enter "+ - - +" to access F002 - Enter "+ - + -" to access F100 - Enter "- + - +" to access F200 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 Package Includes: 1 x Signal Generator Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown. Measurement error allowance is +/- 1–3 cm.