Tech Info Library

Light Sensor Troubleshooting and FAQs

Light Sensor, order code LS-BTA, $55
Specifications and User Guide

-Primary Test: Make sure that the sensor is not picking up the 60 or 120 Hz flicker from fluorescent or other lamps. Eliminate all artificial light sources (except battery powered flashlights) and try your experiment.
-Secondary Test: Test the light sensor positioned as you plan to use it. Set the sampling at 1000 points/second for 0.1 second. If the flicker is the problem, you will see a drastic variation in the light intensity with a period of 60 or 120 Hz (50 or 100 Hz outside North America).
-Secondary Test: Set the sample rate to a number not a factor of 60. Using 30, 20, or 10 samples/s is worse than using 17, 23, 27 samples/s.

TIL 1142: The Light Sensor reading fluctuates, but the light appears steady.
TIL 1982: Light Sensor label has wrong range and incorrect units.
TIL 1948: Can I use a Vernier Light Sensor to measure PAR?
TIL 413: What is the conversion from lux to W/cm^2 ?
TIL 3615: How do I calibrate the Light Sensor?

-new order code: LS-BTA
-old order code: LS-DIN
-Resolution, 10-bit (CBL or CBL 2): 0–600 lux: 0.8 lux, 0–6000 lux: 8 lux, 0–150000 lux: 200 lux
-Resolution, 12-bit (LabPro, Go! Link, ULI, or Serial Box): 0–600 lux: 0.2 lux, 0–6000 lux: 2 lux, 0–150000 lux: 50 lux
-Diameter: approximately 14 mm OD

-Calibrate? No. The sensor is set to the stored calibration before shipping.
-If you wish to calibrate the sensor, there are two options. One method requires a calibrated light meter and is similar to the procedure used to calibrate any other Vernier probe. The other method requires no extra equipment and is based on the known sensitivity of the Light Sensor. Refer to the detailed instructions on page 4 for the sensor booklet.

-TI Light Probe, order code TILT-BTA, $13

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