Noise Transducer Aluminium Alloy High Accuracy Environment Sound Level Meter for Vehicles DC9-30V YGC-ZS-KV-A1 4-20mA Output Item Type: Noise Transducer Length: Approx. 292mm / 11.5in Power Supply: DC 9-30V Measurement Range: 30-130dB(A) Sensitivity: -38±3dB (or 12.6mv/Pa) Resolution: 0.1dB Accuracy: ±3dB, calibrated at 23±5℃ ambient temperature, frequency weighted in accordance with IEC 61672 type 2 standard, calibration performed under the condition of input signal at 94dB (1kHz) Frequency Range: 20Hz-12.5kHz Response Time: 200ms, time response simulates the human ear's time response Calibrator: for Bruel and Kjaer company, multifunction sound calibrator, model 4231 Microphone: Electret microphone Directivity: Omnidirectional Microphone Size: 0.5 Inch Load Capacity: Impedance ≤350Ω for current output when powered by DC12V, ≤900Ω for current output when powered by DC24V, impedance ≥1KΩ for voltage output. Maximum Power Consumption: 500mW Material: Aluminum Alloy Operating Environment: Temperature: -40℃-80℃, Humidity: ≤100% RH Non Condensing Proof Grade: IP55 Troubleshooting : The meter displays an incorrect value when outputting. It may be due to the wiring problem or communicating serial port failure that the correct data cannot be obtained. Please check whether the wiring is correct and firm, whether the serial port is occupied, and whether the serial port setting is correct. Line Sequences:Wire Color: Output Signal, CurrentRed: Positive Power Supply Black: Negative Power Supply Yellow: Signal Weight: Approx. 418.00g / 14.74oz