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
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°
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.
|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.