Extech 407750 is a digital sound level meter produced by Extech Company. The product can measure sound pressure level, A-weighted sound level, C-weighted sound level, sound pressure level, sound level meter decibels, time weighting, maximum sound pressure level, minimum sound pressure level, frequency response, signal-to-noise ratio.
The Extech Model 407750 is a digital sound level meter designed to measure sound levels in decibels (dB) with selectable frequency weighting ('A' and 'C') and time response options (Fast and Slow). The device features a backlit LCD display, an analog bargraph, and built-in RS-232 PC interface capabilities for real-time data recording. It operates on a 9V battery and includes various functions such as Max Hold, Record (MAX/MIN tracking), and Background Noise Absorber mode.
| Measurement Range (A weighting) | 30 to 130dB |
|---|---|
| Measurement Range (C weighting) | 35 to 130dB |
| Accuracy / Resolution | ± 1.5dB / 0.1dB |
| Time response selections | Fast (125ms) and Slow (1 second) |
| Power Source | 9V Battery |
| Battery Life | 20 hour battery life (typical) |
The meter offers selectable 'A' and 'C' frequency weighting.
Press the MAXHLD key to activate the mode, which updates the LCD only when a higher reading is detected.
It allows the user to accurately measure equipment noise by eliminating background noise from the reading.