Document Overview

This is a user manual for an Extech sound level meter (model 407736). It provides instructions on how to operate the device, understand its features, and maintain it properly.

1. Introduction & Quick Start

️· Purpose: To measure sound pressure levels.
️· Quick Start Steps:
1. Power on the meter (move RANGE switch to LO or HI).
2. Position the microphone (tripod or handheld).
3. Observe the display.
4. Adjust range if "OVER" is displayed.

2. Key Features & Operation

️· 'A' and 'C' Frequency Weighting: Explains the difference and when to use each (A for human ear response, C for flat response).
️· FAST/SLOW Response Time: Describes the function for different measurement needs.
️· MAX HOLD: Allows capturing the peak sound level.
️· Analog Outputs: Provides output for connection to external recorders.
️· Calibration Check: How to perform a basic calibration using the built-in function.

3. Maintenance and Care

️· Battery Replacement: Instructions for replacing the 9V battery.
️· Typical Sound Levels: A table showing typical sound pressure levels in various environments.
️· Important Considerations:
- Use windscreen to avoid wind noise.
- Calibrate periodically.
- Avoid extreme temperatures/humidity.
- Keep dry and avoid vibration.
- Remove battery during long-term storage.

4. Warranty Information

️· Coverage: One-year warranty for parts and workmanship (six months for sensors/cables).
️· Returns: Requires prior authorization.
️· Disclaimer: Extech is not responsible for damages resulting from misuse.

5. Specifications

️· Display: 3 1/2 digit LCD (2000 counts)
️· Measurement Range: 35 - 130 dB
️· Frequency Range: 31.5 Hz to 13 kHz
️· Accuracy: ±1.5 dB
️· Power: 9V Battery
️· Dimensions: 9.45 x 2.68 x 1"
️· Weight: 6.75 oz

6. Calibration and Repair Services

️· Extech offers these services and NIST certification.

Key Terms

️· dB: Decibel (unit of sound level)
️· Hz: Hertz (unit of frequency)
️· Range: The highest and lowest levels a meter can measure.
️· Over: When the signal being measured is outside of the current range.



Hopefully, this summary accurately captures all the vital components of the user manual.