Extech 407730 Digital Sound Level Meter is a sound pressure level meter produced by Extech. This meter can measure sound pressure levels between 40 and 130 dB and supports A and C frequency weighting, fast and slow response time, maximum hold, and maximum/minimum recording.
This user guide explains how to operate the Extech 407730 digital sound level meter, including selecting frequency weighting (A/C), response time (Fast/Slow), and range modes. It details features like Max Hold and Max/Min recording, auto-ranging, and calibration procedures using external calibrators. The guide also covers battery replacement, tripod mounting, and environmental considerations for accurate measurements.
Technical specifications include a 40–130dB measurement range, ±2dB accuracy at 1kHz, and operating conditions from 0 to 50°C. The meter is powered by 4 AAA batteries and features an LCD display with a bargraph. Calibration and repair services are available through Extech’s customer support.
| Measurement Range | 40 to 130dB (A wtg), 45 to 130dB (C wtg) |
|---|---|
| Frequency Weighting | ‘A’ and ‘C’ (selectable) |
| Response Time | Fast: 125 milliseconds / Slow: 1 second |
| Accuracy / Resolution | ± 2dB @1kHz (under reference conditions) / 0.1dB |
| Battery Type | 4 AAA Batteries |
| Battery Life | 30 hours (typical) |
| Operating Temperature | 32 to 122°F (0 to 50°C) |
| Dimensions/Weight | 9 x 2.3 x 1.7” (230 x 57 x 44mm) / 6oz (172g) |
Extech Instruments Corporation offers a one-year warranty against defects in parts and workmanship, with a six-month limited warranty for sensors and cables.
The meter measures sound pressure levels from 40 to 130dB.
Users can select 'A' or 'C' frequency weighting using the A/C button.
The meter will automatically shut off after 20 minutes of operation.