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S2 Spectra Sensors

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 S2 Spectra Sensors:
Universal LightProbe Spectra Sensors test a wide range of LED intensity,
and any colour in the visual spectrum, plus white.  Universal LightProbe
Spectra Sensors are well-suited for the test of “boundary” colour LEDs, 
as they allow the user to set their own PASS/FAIL limits for colour.  
Characteristics
- Typical response time: <10mS capture time; <100mS overall response
   time for colour and intensity simultaneously
- Output Loads:  ‘Int.’& ‘Colour’- 2Kohms min.,100pF, max.
- Further details on Page 5
Colour Response
- Test any LED colour wavelength from 400 to
   700nm, plus white
- Unambiguous and stable analog voltage output
  proportional to LED wavelength
- LED Wavelength = [100(Vout +4)nm]
- For white, the voltage output is 3.5volts
- Enables user to set their own PASS/FAIL limits
- Colour output is independent of LED intensity
- Eliminates need to convert LED wavelength as a
  pulse rate
- Improves the overall response time to test an LED
Intensity Response :
- Analog output ranging from 0 to 4 volts
- Corresponds to LED’s luminous intensity in millicandelas
- C.I.E. photopic-curve-corrected
- Tests LEDs from 1 mcd to 20,000 mcd, and up to
  315,000 mcd with the Spectra Very-Low Sensitivity Sensor
- Read-out < 50mV indicates under-ranging - LED is too dim
- Read-out > 4 volts indicates over-ranging - the LED is
  too bright
- Intensity response depends on size of LED, the
aperture of the fiber-optic probe and the distance
between the probe tip and the LED emitter; for
more information on Sensor Sensitivity Responses
please see Application Note 35
- Available in Low and Very-Low Sensitivity models for
  extremely bright LEDs up to 315,000 mcd.