42275 - Measurement Extech - Free user manual and instructions
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| Product Type | Sound Level Meter |
| Brand | Extech |
| Model | 42275 |
| Measurement Range | 30 to 130 dB |
| Accuracy | ±1.5 dB |
| Frequency Weighting | A and C |
| Time Weighting | Fast and Slow |
| Display | 4-digit LCD with backlight |
| Data Hold | Yes |
| Max/Min Recording | Yes |
| Auto Power Off | After 15 minutes |
| Battery | 9V (6F22) |
| Battery Life | Approximately 50 hours |
| Dimensions | 210 x 55 x 45 mm |
| Weight | About 200 g (including battery) |
| Accessories | Windscreen, 9V battery, user manual |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Storage Temperature | -10°C to 60°C (14°F to 140°F) |
| Safety | Complies with IEC 61672 Type 2 |
Frequently Asked Questions - 42275 Extech
How do I calibrate the Extech 42275 sound level meter?
The Extech 42275 is factory calibrated. For field calibration, use an optional sound calibrator (e.g., Extech 407766) and adjust the calibration pot with a small screwdriver. Refer to the manual for details.
What do the A and C frequency weightings mean?
A-weighting approximates the human ear's response at typical noise levels, while C-weighting is used for peak or high-level measurements. Select A for general noise measurement and C for assessing loudness or peak levels.
How do I use the MAX/MIN function?
Press the MAX/MIN button to start recording the maximum and minimum values. The display will show 'MAX' or 'MIN' alternately. The meter will update these values until you press the button again to exit.
Why does the display show 'UNDER' or 'OVER'?
'UNDER' indicates the sound level is below the lowest measurement range (30 dB). 'OVER' means the level exceeds 130 dB. Move the meter closer or further from the source, or use the appropriate range if available.
Can I use the Extech 42275 with a tripod?
Yes, the bottom of the meter has a threaded insert (typically 1/4-inch) that fits standard camera tripods. This allows for hands-free measurement and consistent positioning.
How do I replace the battery?
Turn off the meter. Open the battery compartment cover on the back by sliding it off. Remove the old 9V battery and connect a new one, observing polarity. Replace the cover.
What is the proper way to store the meter?
Store the meter in a cool, dry place away from direct sunlight and extreme temperatures. Remove the battery if storing for extended periods to prevent leakage. Use the included storage case if available.
How do I clean the Extech 42275?
Use a soft, dry cloth to wipe the exterior. For the microphone, gently brush or use compressed air. Do not use solvents or water. Avoid getting moisture into the microphone.
What accessories are included with the Extech 42275?
The package includes the sound level meter, a windscreen to reduce wind noise, a 9V battery for immediate use, and a user manual. Optional accessories like a calibration kit or carrying case can be purchased separately.
What is the warranty period for the Extech 42275?
Extech offers a one-year warranty against defects in materials and workmanship. For warranty service, contact Extech or your authorized dealer. Keep the proof of purchase.
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