Topcon BM-9A
Luminance Meter
This entry level luminance meter includes the essential features for basic luminance measurements of illuminated surfaces, materials, flat panel displays, and area (extended) light sources. It is a modular design with a separate detector unit (3 options available) and a base unit (computing & display) allowing you to select the optimal detector for the job.
Suitable for laboratory, production line, or outdoor/field measurements (handheld, battery operation), the BM-9A optical instrument meets a wide range of requirements for the most common light measurement jobs.
Features
Wide luminance range
Measure wide luminance ranges from 0.1 to 2,800,000 cd/m2 (with the 1° detector)
Handheld or tripod measurements
Compact design makes the BM-9A easy to use for handheld or tripod measurements
Three detectors available
Three types of detectors available: 2° / 1° / 0.2°
Applications
Luminance measurement of LCDs, CRTs, OLEDs, LEDs, etc.
Transmittance of LCD polarizing plates & filters
Luminance measurement of various light sources
Step it up
If you require lower light measurements (below 0.01 cd/m2), multiple apertures within a single instrument, or color (chromaticity) measurements, consider the Topcon BM-7AC or Topcon BM-5AC. These Color Filter Photometers measure luminance across a broader range with improved speed and precision. Both models make color measurements with dedicated tri-stimulus filters and include four standard measurement apertures: 2° / 1° / 0.2° / 0.1°. The BM-5AC uses a Photo Multiplier Tube (PMT) sensor and is therefore more sensitive than the BM-7AC which uses Silicon Photo Diode sensors.
Specifications
| Parameter | Detector | ||
|---|---|---|---|
| BM-9A20D | BM-9A10D | BM-9A02D | |
| Measurement Aperture | 2° | 1° | 0.2° |
| Optical System | Objective lens: f=36mm F2.5 | ||
| Measurement Distance | 350mm – Inf. | ||
| Luminance Range cd/m2 | 0.01 ~ 280,000 | 0.1 ~ 2,800,000 | 1 ~ 28,000,000 |
| Luminance Accuracy | ±2% of reading ± 2 digit | ||
| Spot Size at 1m | 32.3 mm | 16.2 mm | 3.23 mm |
| Min. Spot Size at 35cm | 9.5 mm | 4.8 mm | 0.95 mm |
| Dimensions | Approx 190mm (L) x 108mm (W) x 57mm (H) | ||
Ordering Information
The BM-9A base unit requires at least one detector unit to make measurements. Choose the detector based on your required minimum luminance (sensitivity) and measurement aperture (determines spot size).
Select the BM-9A20D detector if you must measure luminance levels down to 0.01 cd/m2.
Select the BM-9A02D if you require the smallest measurement spot size and can accept the higher minimum luminance level (1 cd/m2).
Select the BM-9A10D for a good mid-range detector which balances spot size and sensitivity.
See the BM-9A Brochure for available options. Popular options include:
- Keyboard Unit (for entering calibration data or reference measurements)
- RS-232 cable (for connection to a PC)
- AC adapter/battery charger
- AL-13 adapter lens (for reducing the measurement spot).
If you can’t find what you are looking for, contact us for info on Topcon options and accessories.