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.
Wide luminance range
Handheld or tripod measurements
Three detectors available
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-7AS 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-5AS uses a Photo Multiplier Tube (PMT) sensor and is therefore more sensitive than the BM-7AS which uses Silicon Photo Diode sensors.
|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)|
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.