Data Sheet
Page 1
Universal LightProbe™ Spectra USB Sensors
Universal LightProbe Spectra USB Sensors test a wide range of LED intensities and any color in the visual
spectrum, plus white. They provide a digital USB output for direct connection to a PC USB port.
Figure 1: Typical response for a green LED, where “w” = wavelength in tenths
of nanometers and “i” = intensity.
Figure 2: Typical response for four LEDs (red, yellow, green and blue) tested
simultaneously, where “w” = wavelength in tenths of nanometers and
“i” = intensity.
“I”
values
103
Luminous Intensity (mcd)
Figure 3: Graph shows typical intensity response for PLCC green LED tested
with Universal LightProbe Spectra USB Sensor and Small-Aperture FiberOptic Probe
Color Response
The Universal LightProbe Spectra USB Sensors’ ASCIIformatted digital output of LED color can be displayed/
printed-out using either Windows® HyperTerminal communications software, which is included with Windows
versions up to Windows 2000; or with TeraTerm software,
provided by Optomistic Products. The color output is
independent of LED intensity. Figure 1 shows a Windows®
HyperTerminal readout for a single LED under test, and
Figure 2 shows a Windows® HyperTerminal readout of
four LEDs under test simultaneously, using four Spectra
USB Sensors and a four-port hub connected to the PC
USB port, where w = color wavelength in tenths of nanometers. (For further detail on the multi-port display, see
Application Note 37.)
Intensity Response
The Universal LightProbe Spectra USB Sensors test a
wide dynamic range of LED intensity, without adjustment.
The sensor provides a digital output, where i = intensity,
ranging from 0 to 65,0000 (see Figures 1 and 2.) Figure 3 shows the corresponding LED luminous intensity
in millicandelas (C.I.E. photopic-curve-corrected). The
mcd-related scale is consistent with most LED manufacturer’s specifications. An intensity read-out of 4 indicates
under-ranging (LED too dim) and over 65,000 indicates
over-ranging (LED too bright).The sensor’s intensity
response depends on a variety of factors, including the
size of the LED, the aperture of the fiber-optic probe, and
the distance of the probe tip from the LED emitter. The
Spectra USB Sensor will test surface-mount LEDs up to
3,000 mcd’s. For the test of very bright LEDs, Universal
LightProbe Spectra USB Low-Sensitivity and Very Low
Sensitivity Sensors are available. For more information on
sensitivity response in millicandelas, please see Application Note 35. For the test of shades of white LEDs, please
see the Spectra White USB Sensor data sheet.
Reduces Overall Testing Time
Universal LightProbe Spectra USB Sensors’ unique
streaming technology enables LED color wavelength and
intensity to be rapidly accessed by a PC and displayed/
printed-out, which reduces test time and provides
continuous automatic data logging for statistical process
control (SPC).
©2012 Optomistic Products. All rights reserved.
U.S. PATENT
Universal LightProbe™ Spectra USB Sensors
Data Sheet
Page 2
Universal LightProbe Spectra USB Sensor
A standard mini-type B five-pin USB connector is integrated into the Universal LightProbe Spectra USB Sensor, and
a standard USB Cable is provided to connect the sensor
to a PC. Compabatible with Windows operating systems
from Windows XP through Windows 7, using Windows
HyperTerminal (which is included in Windows XP, 2000
and Vista) or TeraTerm software, which is included.
Sensor Characteristics
Sensor size: 0.560 inches diameter x 1.38 inches long
(USB connector extends 0.06 inches at back of sensor)
Operating temperature range: 0oC to 70oC
Typical response time: color and intensity outputs
simultaneously in less than 250mS
Universal LightProbe Sensors are one of the smallest
LED sensors on the market. When paired with
Universal LightProbe Fiber-optic Probes they will test
LEDs spaced as close as 0.050 inches on centers.
Fiber-optic Probes
Universal LightProbe Fiber-Optic Probes range from 0.050
to 0.134 inches in diameter and from 0.325 to 2.340 inches
in length. When using a 4-port hub, up to 4 LEDs can be
tested simultaneously. Choose specific fiber-optic probes
for refined intensity testing, for dim LED’s, or to compensate for misalignment errors, and more. Custom probe
lengths may be ordered.
Installing the Sensor and Fiber-Optic Probe Units
Installation is achieved with one-hole fixing, using a simple
clamp for the sensor and forked clamps for the probes to
allow the height of the probes above the LEDs to be
adjusted.
Part numbers: ULP Spectra USB: Universal LightProbe Spectra USB Sensor - includes USB Cable,
TeraTerm Software and Driver Software (note Windows HyperTerminal Software included with Windows).
Also available: ULP Spectra USB LS: Universal LightProbe Spectra USB Low Sensitivity Sensor
ULP Spectra USB VLS: Universal LightProbe Spectra USB Very Low Sensitivity Sensor
See Application Note 35 for more detail on sensor sensitivity ranges
The information in this data sheet is intended to be a general product description. Optomistic Products reserves the right to make changes in specifications and
characteristics at any time without notice. Unless specified otherwise, all dimensional values are nominal.
©2012 Optomistic Products. All rights reserved.
PO Box 751 • South Freeport, ME 04078 USA | Phone (207) 865-9181 • Fax (207) 865-9182
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U.S. PATENT