1. Introduction
The M&A INSTRUMENTS SM208 Screen Luminance Meter is a precision instrument designed for measuring the brightness of various display screens. It utilizes a highly stable silicone photocell detector to ensure accurate and reliable photometric measurements. This manual provides detailed instructions for the proper setup, operation, and maintenance of your SM208 meter.
2. Product Overview and Features
The SM208 meter is engineered for ease of use and portability, offering a wide measurement range suitable for various applications. Its key features include:
- High Stability Detector: Equipped with a silicone photocell detector for high stability, photostability, and shock resistance, ensuring accurate photometric measurements.
- Wide Measuring Range: Capable of measuring luminance between 0.01-39990 cd/m² without requiring a dimmer.
- Digital Display: Features a clear digital display with good indication reproducibility.
- Data Latching Functions: Includes data latching and peak value latching functions for convenient reading.
- Low Power Consumption: Designed for very low power consumption, allowing continuous operation for up to 100 hours on a single 9V layer-built battery.
- Compact Design: Mini light probe with a measuring angle of less than 10 degrees, making it compact, portable, and easy to use.
Figure 2.1: The SM208 Screen Luminance Meter with its external light probe. The display shows a reading of 38.68 cd/m².
3. Package Contents
Upon opening the package, please verify that all items listed below are present and in good condition:
- SM208 Screen Luminance Meter Unit
- External Light Probe
- Protective Carrying Case
- User Manual (this document)
- Note: A 9V battery is required for operation and is not included in the package.
Figure 3.1: Contents of the SM208 package, including the meter, probe, and user manual, neatly organized within the protective carrying case.
4. Setup
4.1 Battery Installation
- Locate the battery compartment on the back of the SM208 meter.
- Open the battery compartment cover.
- Insert one 9V layer-built battery, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
4.2 Connecting the Light Probe
- Identify the connector port on the top of the SM208 meter unit.
- Align the connector of the external light probe with the port.
- Gently push the probe connector into the port until it is firmly seated. Do not force the connection.
5. Operation
5.1 Powering On/Off
- To power on the device, press the POWER button. The display will illuminate.
- To power off the device, press and hold the POWER button until the display turns off.
5.2 Selecting Measurement Range
The SM208 offers multiple measurement ranges to accommodate different luminance levels. Use the RANGE buttons to select the appropriate range:
- 39.99 cd/m²: For very low luminance measurements.
- 399.9 cd/m²: For low to medium luminance measurements.
- 3999 cd/m²: For medium to high luminance measurements.
- 39990 cd/m²: For high luminance measurements.
Always select a range that is higher than the expected measurement to avoid over-range indications.
5.3 Taking Measurements
- Ensure the light probe is securely connected.
- Power on the meter.
- Select an appropriate measurement range using the RANGE buttons.
- Position the light probe directly against the screen or surface to be measured. Ensure the probe's sensor is fully exposed to the light source.
- Read the luminance value displayed on the screen in cd/m².
5.4 HOLD Function
Press the HOLD button to freeze the current reading on the display. Press it again to release the hold and resume live measurements.
5.5 PEAK Function
Press the PEAK button to capture and display the maximum luminance value detected during a measurement session. Press it again to exit peak hold mode.
6. Maintenance
6.1 Cleaning
To clean the meter and probe, use a soft, dry cloth. Do not use abrasive cleaners or solvents, as these may damage the device's surface or sensor. Keep the light sensor clean and free from dust or smudges for accurate readings.
6.2 Battery Replacement
When the battery indicator appears on the display, replace the 9V battery as described in Section 4.1. Remove the battery if the device will not be used for an extended period to prevent leakage.
6.3 Storage
Store the SM208 meter in its protective carrying case in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid storing in environments with high humidity or corrosive gases.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter does not power on. | Dead or incorrectly installed battery. | Check battery polarity. Replace with a new 9V battery. |
| Inaccurate or fluctuating readings. |
|
|
| Meter shows "OL" or over-range. | Luminance exceeds the selected range. | Switch to a higher measurement range (e.g., 39990 cd/m²). |
| Display is dim or flickering. | Low battery power. | Replace the 9V battery. |
8. Specifications
| Parameter | Value |
|---|---|
| Model | SM208 |
| Measurement Range | 0.01 - 39990 cd/m² |
| Measurement Accuracy | ±0.8% (typical) |
| Detector | Silicone Photocell |
| Measuring Angle | <10° |
| Power Supply | 1 x 9V Layer-Built Battery |
| Battery Life | Approximately 100 hours (continuous operation) |
| Item Weight | 2.2 pounds (approx. 1 kg) |
| Package Dimensions | 10 x 5 x 2 inches (approx. 25.4 x 12.7 x 5.1 cm) |
Figure 8.1: Visual representation of the SM208 meter highlighting its measurement range, distance, and accuracy.
9. Warranty and Support
M&A INSTRUMENTS products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please contact your authorized dealer or M&A INSTRUMENTS customer service directly. Please have your product model number (SM208) and purchase date available when contacting support.
Note: Specific warranty terms may vary by region and retailer. Please refer to your purchase documentation for details.