Model 424R: LED Measurement Head - Radiometric
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| This sensor head couples a filtered silicon sensor with a flat spectral response (based on the Model 247) with a special fixture to measure the averaged radiant intensity of LEDs according to the recommendations of CIE Publication 127 (illustrated above; LED Sockets sold separately). The intensity fixture precisely sets the distance and alignment between the LED and the sensor‚ so that measurement accuracy and repeatability are ensured. The system can easily be configured for either of the CIE-prescribed geometries: Condition A or Condition B. Measurement results are expressed in units of watts per steradian (W/sr). The sensor's response is approximately constant (within ±5%) from 450 nm to 950 nm‚ to allow quick measurements of devices with unknown peak waelengths‚ etc. The sensor is calibrated over the a wider spectral range (350 - 1100 nm)‚ so that the peak wavelength of the device under test (where known) can be selected during measurement‚ ensuring maximum possible measurement accuracy. |
| Standard Calibration(s) | Radiant Intensity (W/sr) for both CIE127 Conditions: A and B |
| Calibration range | 350 - 1100 nm in 10 nm steps |
| Spectral Flatness | 5%-7% over the spectral range: 450 - 950 nm |
| Related documents | Precision LED Sockets |
