OOTDTY Features: 4-20mA two-wire current loop without source, wiring compatible with 2, 3, 4-wire system 9 programmable outputs (can simulate the actual dynamic test environment, each section can be set to working time/current A/current b). Digital rotary control encoder (using potentiometer, easily affected by temperature and humidity, the resistance value will change). It can be connected to positive and negative (two-wire system, no matter how wiring, can work, will not burn the meter). High precision, good linearity (output accuracy: ± 0.5%, display accuracy: 0.01)Coarse modes and fine adjustment can be set for quick and fine adjustmentOutput range can be set: 4-20mA (control device) / 3-21mA (debug signal)Display mode: real current/100.0%/50.0Hz, LCD (with backlight). Line output, calibratable Can be set to automatically store output values: automatic/manual 2-9 output points of quick adjustment can be set Imported chips, ultra-low power consumption, non-fired, more stable output. The coating is beautiful and easy to install. System Operation:Parameter Settings: (rotate one grid clockwise is "+" rotate one grid counterclockwise is "-", press the knob. There is "confirm")1. Press and hold the knob for 2 seconds to input the parameter setting, display the parameter number "F001", then press "confirm" to set the parameter value "F001", = 0 is coarse tuning; = 1 precision attire; Then press "confirm" to save its value.2. When the parameter number "FXXX" is displayed, the rotation modification parameter number "+" "-"; First, enter the password "+ - - +" to enter the F002 parameter; first, enter the password "+ - + -" to enter the F100 parameter; First, enter the password "-+ - + " to enter the f200 parameter. Specification: Supply Voltage: 15V-30V Output Range: 4-20mA/3-21mAToncing Frequency: Real Current/0-100.0%/ 0-50.0HzSampling Resistance: Less than 500 ohmsOutput Accuracy: ± 0.5%Display, you can mention them: 0.01Shell Material: ABS Measurements: 79.5x42.2x2 4mm/3.13x1.66x0.94inchColor: BlackQuantity: 1PcNote: 1. Please allow 0-1cm error due to manual measurement. Pls make sure you do not mind before bidding.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!3. If you need a PDF version of the manual, please . Package Included:1 x Current Loop Signal Generator1 x User Manual (English)