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General| Dimensions | Approx. 76 (W) x 167 (H) x 35 (D) mm |
|---|---|
| Weight | Approx. 240 g (including batteries) |
| Measurement functions | Lp |
| Frequency weighting | A, C |
| Time weighting | Fast, Slow |
| Microphone | 1/2 inch Electret Condenser Microphone |
| Frequency Range | 20 Hz to 20 kHz |
| Display | LCD with backlight |
| Memory | Internal memory for data storage |
| Interfaces | USB |
| Power | AA batteries or USB bus power |
| Power Supply | AA batteries |
Details the content and purpose of the instruction manual itself.
Identifies and explains the operation keys, connectors, and parts of the unit.
Explains how to check, install, and set up the unit before use.
Details the procedures for calibrating the unit for accurate measurements.
Describes how to operate the POWER key to turn the unit on and off.
Explains symbols and information shown on the unit's display.
Covers the basic procedures for performing measurements with the unit.
Explains how to store and manage measurement data.
Provides detailed technical specifications of the NA-28 unit.
Explains how to power the unit using batteries or AC adapter.
Details the internal electrical calibration procedure for the unit.
Explains acoustic calibration using an external sound calibrator.
Step-by-step instructions for powering on the NA-28 unit.
Instructions on how to properly turn off the NA-28 unit.
Explains the elements and indicators of the sound level meter display.
Outlines the procedure for performing basic sound level measurements.
Explains how to measure equivalent continuous sound levels.
Details the process for measuring sound exposure levels.
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