Probe Introduction (Optomistic Products)




The light probes/Sensors cannot be used separately.Please purchase both items.




After choosing a pre-programmed Sensor for the type of test and output you require,then choose a Fiber-optic Probe to further customize the test for mechanical requirements and constraints. Fiber-optic Probes come in a variety of aperture styles (wide-aperture,small-aperture,contacting tip),fiber-optic cable type, and stainless-steel tip lengths to meet your exact requirements for testing LEDs.these options are outlined below.


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 Fiber-Optic Probes

To determine which fiber-optic probes is best for a specific LED test application, please see the table below. And, below are some guidelines to help you choose.

Closely-spaced LEDs and Cost Efficient Test

In cases where the spacing between LEDs is as close as 0.050 inches(1.27mm) on center, a range of small-aperture fiber-optic probes with non-contacting tips are available.
Our wide selection of these non-contacting tips includes the popular Trident, which allows the sequential test of three LEDs with a single sensor for a significant cost savings.

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Refined Intensity Measurement

The insulated, “contacting” spring-tipped fiber-optic probes are provided for more refined intensity LED measurement.
By enabling the contact of the probe tip to the LED, we eliminate the variations in intensity measurement that can be caused by variations in the working distance between the LED and the probe tip.

Dim LED and Misalignment Errors

Wide-aperture fiber-optic probes, which allow four times the amount of light input as small-aperture probes, compensate for dim LEDs and potential mis­alignment errors in ATE test.
Also great for testing finished-product displays such as illuminated switch alpha-numeric icons.
The wide-aperture fiber-optic probes are available with or without insulated, contacting spring tips.

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 Probe Part Numbers


Below are sample part numbers and what they indicate.


250:Indicates the length of the cable in millimeters
SF:Indicates the type of special cable, in this case, SuperFlex

34 Indicates the diameter of the probe tip, in this case,3.4mm
LL:Indicates the length of the probe tip, in this case, Long Length - dimensions available on individual data sheets

WA:Indicates the aperture of the probe, in this case “wide aperture,” could also be SA, or “small aperture” with smaller diameter probe

CT:Indicates a “contacting” probe tip



XXX:Indicates stainless-steel encased rigid probe
27:Indicates the diameter of the probe/tip, in this case 2.7mm
LL:Indicates the length of the probe tip, in this case, Long Length - dimensions available on individual data sheets
WA:Indicates the aperture of the probe, in this case “wide aperture”



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Which Is Best For Your Test?

The chart below outlines the types of fiber-optic probes that are best used for each specific LED test application. See also the sensor selection chart to determine which sensor is best for each LED test application.

Fiber-Optic Probe Type
Test closely Spaced LEDs-0.050 inch(1.27mm) on center
Test two or three LEDs with a single sensor (requires ability to turn LEDs on one-at-a-time)
Compensate for mis-alignment of probu tip to LEDs Test dim LEDs Refined intensuty test
Diffcult to access LEDs Test side-facing LEDs Install without clamps
0.50in/1.2mm Diameter,Small Aperture Probes

Duplex and Trident Small Aperture Flexi Probes
0.109in/2.7mm Diameter,Wide-
Aperture Probes
Aperture,Contacting Probe Tips
Aperture Probes
"Periscope" Wide-
Aperture Probes
Stainless Steel Encased Probes

- Duplex and Trident fiber-optic probes are available in small-aperture sizes only and provide the sequential test of 2 or 3 LEDs (the LEDs must be turned on one-at-a-time) .

- Wide-aperture fiber-optic probes allow 4x the amount of light input as small-aperture fiber-opticprobes and are recommended for the test of dim LEDs, or mis-aligned LEDs.

- Contacting fiber-optic probe tips are recommended for more refined intensity measurement as they ensure a consistent distance between the fiber-optic probe tip and the LED under test.


SMALL-APERTURE(SA)FIBER-OPTIC PROBES:Our most popular and cost-efficient option.

Appropriate for most testing applications.The best choice for testing closely-spaced LEDs. Small-Aperture Fiber-Optic Probes come in single models for testingsingle LEDs,"Duplex" for testing two LEDs sequentially,and the "Trident" and "Skinny Trident" models for testing three LEDs sequentially.


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