1. Introduction
The LANDTEK SL-1256DOS Logging Personal Noise Dose Meter is a specialized test equipment designed to evaluate noise conditions in working environments by measuring accumulated noise exposure. It is particularly useful for assessing noise levels for workers in industries such as steel rolling, where hearing can be impacted, enabling the implementation of protective measures.
2. Safety Information
Please read this instruction manual thoroughly before operating the device to ensure safe and correct usage. Keep this manual for future reference.
- Do not attempt to open or modify the device. Refer all servicing to qualified personnel.
- Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.
- Ensure batteries are inserted with correct polarity. Remove batteries if the device will not be used for an extended period.
- Keep the device away from strong electromagnetic fields.
- Clean the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
3. Package Contents
Verify that all items are present in the package:
- Main Unit (SL-1256DOS Noise Dose Meter)
- External Probe (Microphone with integral cable)
- Screwdriver
- Carrying Case (B04)
- Operation Manual
Optional accessories (may be sold separately):
- USB Data Cable with Software
- Bluetooth Data Adapter with Software
Figure 1: Included accessories and carrying case.
4. Product Overview
Familiarize yourself with the components and controls of your SL-1256DOS Noise Dose Meter.
Figure 2: Nomenclature and Functions of the SL-1256DOS.
- Microphone: 1/2-inch electret condenser microphone for sound detection.
- Display Panel: Liquid Crystal Display (LCD) showing measurement data and menu options.
- POWER/MENU Key:
- Press to turn the meter on.
- Press for 3 seconds to turn the meter off.
- Changes operating mode.
- Press to cycle through Sound Level Meter mode (SLM), Measure, Store and Recall Data mode (DATA), Dose setup mode (SET UP), and Selecting and Changing Options mode (OPTION).
- In data recording mode (DATA REC), press MENU key then press key immediately to exit this mode.
- LEFT Key: Select active options from the current menu.
- DOWN Key: Select active options from the current menu.
- UP Key: Select active options from the current menu.
- RIGHT Key: Select active options from the current menu.
- RUN/PAUSE/ENTER Key: Initiates, pauses, or confirms operations.
- USB Interface: For connecting to a PC for data transfer.
- Battery Compartment: Houses 4x1.5V AAA Size (UM-4) batteries.
- Microphone Input Jack: Connects the external microphone probe.
5. Setup
5.1 Battery Installation
- Locate the battery compartment cover on the back of the device (refer to Figure 3).
- Use the provided screwdriver to open the battery compartment.
- Insert four 1.5V AAA (UM-4) batteries, ensuring correct polarity.
- Close the battery compartment cover and secure it with the screw.
Figure 3: Battery compartment on the back of the meter.
5.2 Microphone Connection
- Connect the external microphone probe cable into the microphone input jack on the top of the main unit (refer to Figure 4).
- Ensure the connection is secure.
Figure 4: External microphone probe.
Figure 5: Noise dose meter with microphone connected.
5.3 Initial Power On and Stabilization
After connecting the microphone and installing batteries, press the POWER key to turn on the device. Allow approximately 10 seconds for the meter to stabilize before taking measurements.
6. Operation
6.1 Power On/Off
- To Power On: Press the POWER key (labeled '3' in Figure 2).
- To Power Off: Press and hold the POWER key for approximately 3 seconds.
6.2 Menu Navigation and Mode Selection
Use the MENU key (labeled '3' in Figure 2) to cycle through the main operating modes:
- Sound Level Meter (SLM) Mode: For real-time sound level measurements.
- Measure, Store and Recall Data (DATA) Mode: To manage stored measurement results.
- Dose Setup (SET UP) Mode: To configure dose measurement parameters.
- Selecting and Changing Options (OPTION) Mode: To adjust various device settings.
Use the UP, DOWN, LEFT, and RIGHT arrow keys (labeled '4', '5', '6', '7' in Figure 2) to navigate within menus and select active options. The RUN/PAUSE/ENTER key (labeled '8' in Figure 2) is used to start/pause measurements or confirm selections.
6.3 Keypad Lock
To prevent accidental operation, the keypad can be locked:
- To Lock: Press the UP and RIGHT arrow keys simultaneously.
- To Unlock: Press the LEFT and DOWN arrow keys simultaneously.
6.4 Measurement Control and Timers
- Measurement Duration: Can be set from 5, 10, 15, or 30 minutes, or 1, 2, 4, 8, 10, 12, or 24 hours.
- Timers: Up to 16 timers can be set for automatic start and stop of measurements, up to one month in advance. Timers can be configured via the PC software or directly on the meter keypad.
6.5 Data Logging
The device supports logging of all measurement parameter values.
- Logging Period (LP): Selectable intervals include 1s, 2s, 5s, 10s, 15s, 20s, 30s, 1min, 2min, 5min, 10min, 15min, 20min, 30min, or 60min.
- Logging Capacity: Up to 120,000 values can be stored at any one time.
6.6 Data Output
The SL-1256DOS features a USB interface for connecting to a PC. This allows for downloading stored measurement results and configuring advanced settings using the dedicated PC software (if purchased).
Figure 6: USB connection for data transfer.
6.7 Operational Demonstration Video
Video 1: Demonstration of the noise dose meter's operation and microphone attachment.
7. Maintenance
7.1 Cleaning
Wipe the device and microphone with a soft, dry cloth. Do not use liquid cleaners, solvents, or abrasive materials, as these can damage the device or affect its accuracy.
7.2 Storage
When not in use, store the SL-1256DOS in its carrying case (Figure 1) in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid areas with high humidity or dust.
7.3 Battery Care
If the device will not be used for an extended period (e.g., more than one month), remove the batteries to prevent leakage and potential damage to the device. The battery indicator on the display will flash when the voltage is insufficient for operation, indicating that batteries need replacement.
8. Troubleshooting
If you encounter issues with your SL-1256DOS, refer to the following common problems and solutions:
- Device does not power on:
- Check if batteries are installed correctly with the right polarity.
- Replace old or depleted batteries with new ones.
- Inaccurate or no readings:
- Ensure the external microphone probe is securely connected to the main unit.
- Check that the microphone is not obstructed or damaged.
- Verify that the device has completed its 10-second stabilization time after power-on.
- Consider performing a calibration if readings are consistently off (refer to the full operation manual for calibration procedures, if applicable).
- Problems with data transfer to PC:
- Ensure the USB cable is properly connected to both the device and the PC.
- Verify that the PC software (if applicable) is correctly installed and running.
- Check for any driver issues on your PC.
- Keypad unresponsive:
- Check if the keypad lock is activated. Unlock it by pressing the LEFT and DOWN arrow keys simultaneously.
If the problem persists after trying these steps, please contact customer support.
9. Specifications
| Feature | Specification |
|---|---|
| Standard Applied | IEC61252, ANSI S1.25 – 1992 for dose meter and sound exposure meters. IEC 61672-1-2013 Class 2 |
| Microphone | 1/2-inch electret condenser microphone with 31-inch integral cable |
| Display | Liquid Crystal Display |
| Measurement Ranges (at 4KHz) | 60 – 130 dB (A and C) / 70 – 140 dB (A and C) |
| Peak Ranges | 60 – 130: 93 – 133dB Peak (C-weighted or Linear Peak over top 40dB) 70 – 140: 103 – 143dB Peak (C-weighted or Linear Peak over top 40dB) |
| Frequency Weightings | RMS Detector: A or C; Peak Detector: C or Z (Linear) |
| Time Weightings | Fast and Slow (RMS detector) |
| Exchange Rate | 3, 4, 5 or 6dB |
| Stabilization Time | 10 seconds from power on |
| Threshold Level | 70 – 90dB in 1dB steps (User-defined) |
| Criterion Level | 80, 84, 85 or 90dB (User-defined) |
| High Level Detector | 115dB |
| Clock | Real–time clock with calendar |
| Memory | Results from 50 measurements can be stored for reviewing and download |
| Measurement Duration | May be set to 5, 10, 15, or 30 minutes or 1, 2, 4, 8, 10, 12, or 24 hours |
| Timers | Up to 16 timers (automatic start and stop) can be set (maximum up to one month ahead of measurement time) |
| Logging Period (LP) | 1s, 2s, 5s, 10s, 15s, 20s, 30s, 1min, 2min, 5min, 10min, 15min, 20min, 30min or 60min |
| Logging Capacity | 120000 values can be stored at any one time |
| Built-in Setups | Eight built–in (predefined) default setups: OSHA80, OSHA90, MSHA-80, MSHA-90, DOD, ACGIH, ISO85 and ISO90. Nine additional user–defined setups can be stored. |
| Output | USB interface |
| Power Supply | 4x1.5V AAA Size (UM-4) Battery |
| Operating Temperature & Humidity | 0 – 50ºC (32 to 122ºF), 10 – 90%RH |
| Storage Temperature & Humidity | -10 – 60ºC (14 to 140ºF), 10 – 75%RH |
| Size | 140x72x34mm |
| Weight | Approx. 350g (including batteries) |
| Customized support | OEM |
| Place of Origin | Guangdong, China |
10. User Tips
No specific user tips were available from provided reviews or Q&A content.
11. Warranty and Support
11.1 Warranty Information
The LANDTEK SL-1256DOS Logging Personal Noise Dose Meter comes with a 1-Year Warranty from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal use. Please retain your proof of purchase for warranty claims.
11.2 Technical Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact the seller or the manufacturer's customer support. Ensure you have your product model number (SL-1256DOS) and purchase details ready when contacting support.
