Introduction
The Voltcraft SL-451 is a digital sound level meter designed for precise noise measurement and data logging. This device complies with IEC 61672-1 Class 2 standards, making it suitable for various professional applications. It features a robust housing with injected rubber protection, ensuring durability in challenging environments. The integrated data logger can store up to 32,000 measurements, which can be transferred to a PC via a USB interface for detailed analysis using the included software. An extendable microphone cable allows for flexible measurement in hard-to-reach areas.
Safety Instructions
Please read these safety instructions carefully before operating the device to ensure safe and proper use.
- Do not expose the device to extreme temperatures, direct sunlight, or high humidity.
- Avoid strong vibrations or mechanical shocks.
- Do not open the device housing; refer servicing to qualified personnel.
- Use only the specified power supply and accessories.
- Keep the device out of reach of children.
- Ensure the microphone is clean and free from obstructions for accurate readings.
Package Contents
Verify that all items are present upon unpacking:
- Voltcraft SL-451 Digital Sound Level Meter
- Microphone extension cable (3 meters)
- USB cable
- PC software CD
- Power adapter
- Carrying case
- User manual
Device Overview
Familiarize yourself with the main components of the SL-451.
- Microphone: For sound detection.
- LCD Display: Shows measurement values, settings, and status indicators.
- Control Buttons: For power, mode selection, data hold, and other functions.
- USB Port: For PC connection and data transfer.
- Power Input: For external power supply.
- Battery Compartment: For battery installation.
Setup
1. Powering the Device
The SL-451 can be powered by batteries or an external power adapter.
Battery Installation:
- Open the battery compartment cover on the back of the device.
- Insert the required batteries, observing correct polarity.
- Close the battery compartment cover securely.
External Power:
Connect the provided power adapter to the device's power input and then to a suitable power outlet.
2. Microphone Connection
The device comes with a detachable microphone and an extension cable.
- For direct use, ensure the microphone is securely attached to the main unit.
- For remote measurements, connect the microphone to one end of the 3-meter extension cable and the other end of the cable to the device's microphone input.
- Always use the foam windscreen on the microphone to minimize wind noise interference.
3. Software Installation (for Data Logging)
To utilize the data logging and analysis features, install the provided PC software.
- Insert the software CD into your computer's CD/DVD drive.
- Follow the on-screen instructions to install the software.
- After installation, connect the SL-451 to your computer using the supplied USB cable.
- The software should automatically detect the device. If not, refer to the software's help documentation for troubleshooting connection issues.
Operating Instructions
1. Basic Measurement
- Press the POWER button to turn on the device.
- The display will show the current sound level in decibels (dB).
- Weighting (A/C): Use the A/C button to switch between A-weighting (for general noise measurement, mimicking human ear response) and C-weighting (for measuring peak sound pressure levels).
- Response Time (FAST/SLOW): Use the FAST/SLOW button to select the desired response time. Fast response is suitable for rapidly changing noise, while slow response is for more stable noise levels.
- Range Selection: The device features an automatic range selection from 30 to 130 dB. Manual range adjustment may also be available depending on the model's specific firmware.
- MAX/MIN Hold: Press the MAX/MIN button to display the maximum or minimum sound level recorded during a measurement session. Press again to cycle through modes or exit.
- Data Hold: Press the HOLD button to freeze the current reading on the display. Press again to release.
2. Data Logging
The SL-451 can record up to 32,000 measurements.
- Ensure the device is powered on.
- Press the REC button to start data logging. The "REC" indicator will appear on the display.
- Press the REC button again to stop logging.
- To retrieve logged data, connect the device to a PC using the USB cable and open the installed software.
- Follow the software instructions to download, view, and analyze the recorded measurements. The software supports analysis according to standards like DIN 15905-5.
3. Calibration
For accurate measurements, periodic calibration is recommended. The device is calibratable.
- Use a standard sound calibrator (e.g., Voltcraft SLC-100, if available) to perform calibration.
- Refer to the specific instructions provided with your calibrator and the SL-451's detailed manual for the calibration procedure.
- Incorrect calibration can lead to inaccurate readings.
Maintenance
Cleaning:
- Wipe the device with a soft, dry cloth.
- Do not use abrasive cleaners or solvents.
- Keep the microphone clean and free of dust or debris.
Storage:
- When not in use for extended periods, remove the batteries to prevent leakage.
- Store the device in its carrying case in a cool, dry place.
Battery Replacement:
Replace batteries when the low battery indicator appears on the display to ensure continuous operation and accurate readings.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on. | Low or dead batteries; incorrect battery polarity; power adapter not connected. | Replace batteries; check battery polarity; ensure power adapter is securely connected. |
| Inaccurate readings. | Microphone obstructed; device not calibrated; incorrect weighting/response time. | Clean microphone; perform calibration; check A/C weighting and FAST/SLOW settings. |
| Cannot connect to PC. | USB cable faulty; software not installed correctly; driver issues. | Try a different USB cable; reinstall software; check device manager for driver conflicts. |
| Data logging not working. | Memory full; REC button not pressed correctly. | Download data to PC and clear device memory; ensure REC button is pressed until indicator appears. |
Specifications
| Model: | SL-451 |
| Measurement Range: | 30 to 130 dB (A/C) |
| Accuracy: | ± 1.4 dB |
| Frequency Range: | 31.5 Hz to 8 kHz |
| Weighting: | A and C |
| Response Time: | Fast / Slow |
| Data Logger Capacity: | Up to 32,000 measurements |
| Interface: | USB |
| Compliance: | IEC 61672-1 Class 2 |
| Dimensions (L x W x H): | 5 x 7.6 x 27.8 cm (1.97 x 2.99 x 10.94 inches) |
| Weight: | 350 grams (0.77 lbs) |
| Material: | Rubber (exterior protection) |
| Special Features: | Bargraph, Calibratable, Battery/Power supply operation, Min/Max memory, Backlight, Analog output. |
Warranty and Support
Voltcraft products are designed for reliability and performance. This device comes with a standard warranty as per local regulations. For specific warranty terms and conditions, please refer to the documentation included with your purchase or visit the official Voltcraft website.
Spare Parts Availability: Spare parts are available for 1 year from the date of purchase.
For technical support, troubleshooting assistance beyond this manual, or service inquiries, please contact Voltcraft customer service or your authorized dealer. Contact information can typically be found on the manufacturer's website or in your product packaging.