Noise Sensor Decibel Test Transducer Sound Level Sensor RS232 Output 30-130dB Measurement Range DC5V Item Type: Noise Sensor Length: Approx. 292mm / 11.5in Power Supply: DC 5V Output Format: RS232 Measurement Range: 30-130dB (A) Sensitivity: -38±3dB (or 12.6mv/Pa) Resolution: 0.1dB Accuracy: ±3dB, calibrated at 23±5℃ ambient temperature, frequency weighting conforms to IEC 61672 type 2 standard, calibrated at input signal of 94dB (1kHz) Frequency Range: 20Hz to 12.5kHz Response Time: 200ms, time response simulates human ear response Calibrator: For 4231 Multifunctional sound calibrator 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 Working Environment: Temperature -40℃-80℃, Humidity: ≤100%RH non condensing Protecting Level: IP55 Troubleshooting: The meter displays incorrect values at output. The correct data cannot be obtained because the cable connection is faulty or the comm serial port is faulty. Check whether the cable connection is correct and secure, whether the serial port is occupied, and whether the serial port settings are correct. Red Wire: Power Positive Pole Black Wire: Connect to computer serial port 2 pin RX Yellow Wire: Connect to computer serial port 3 pin TX Green Wire: Power Negative Pole Weight: Approx. 418g / 14.7oz