475044-SD - Measuring equipment Extech - Free user manual and instructions
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| Product Type | Sound Level Meter with Data Logging |
| Brand | Extech |
| Model | 475044-SD |
| Dimensions (approx) | 7.5 x 3.5 x 1.5 in (190 x 89 x 38 mm) |
| Weight (approx) | 0.5 lb (227 g) including batteries |
| Power Source | 4 x AA batteries (alkaline recommended) |
| Battery Life | Approximately 20 hours continuous use |
| Measurement Range | 30 to 130 dB |
| Frequency Weighting | A and C |
| Time Weighting | Fast (125 ms) and Slow (1 s) |
| Data Logging | SD card (FAT16/FAT32) up to 16 GB, CSV format |
| USB Interface | Mini USB for data transfer |
| Display | 3.5-digit LCD with backlight |
| Other Functions | Max/Min hold, overange indication, auto power off |
| Accuracy | ±1.5 dB (ref 94 dB @ 1 kHz) |
| Calibration | Factory calibrated; recommend annual recalibration |
| Operating Temperature | 32 to 104°F (0 to 40°C) |
| Storage Temperature | 14 to 140°F (-10 to 60°C) |
| Humidity | < 80% RH non-condensing |
| Accessories Included | SD card, USB cable, windscreen, carrying case, batteries |
| Maintenance | Wipe with damp cloth; do not use solvents |
| Safety Precautions | Use hearing protection above 85 dB; avoid moisture |
| Spare Parts / Reparability | No user-serviceable parts; contact Extech for service |
Frequently Asked Questions - 475044-SD Extech
What type of battery does the Extech 475044-SD use?
The meter uses four AA alkaline batteries. For best performance, use high-quality alkaline batteries.
How do I set up data logging on the SD card?
Insert a formatted SD card (FAT16/FAT32, up to 16 GB). Press the LOG button to start logging. The meter will create a CSV file with date, time, and sound level data.
Can I connect the meter to a computer?
Yes, via the mini USB port. Use the included USB cable to transfer logged data from the SD card or for real-time output (requires software).
What is the difference between A and C frequency weighting?
A-weighting (dBA) approximates human ear response for moderate levels. C-weighting (dBC) is flatter and used for high-level or peak measurements.
How do I calibrate the sound level meter?
The meter is factory calibrated. For recalibration, use an external calibrator (e.g., Extech 407766). Refer to the manual for adjustment pot locations.
What does 'FAST' and 'SLOW' time weighting mean?
FAST (125 ms) responds to quick changes, suitable for transient noises. SLOW (1 s) averages readings for steady sound levels.
Can I measure peak sound levels?
Yes, the meter includes a peak hold function. Press the PEAK button to capture the maximum instantaneous sound level.
How do I change the battery?
Open the battery compartment on the back. Remove old batteries and insert four new AA batteries observing polarity. Close the cover securely.
What should I do if the meter shows 'OVER'?
This indicates the sound level exceeds the measurement range (130 dB). Use a higher range if available or move away from the source.
How do I clean the meter?
Wipe the exterior with a soft, damp cloth. Do not use abrasive cleaners or solvents. Avoid moisture ingress into the microphone.
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USER MANUAL 475044-SD Extech
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Product information
Brand : Extech
Model : 475044-SD
Category : Measuring equipment