FINN®
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FINN® Specification Manual Information in this document is provided in connection with the FINN® product. FINN Test Electronics (FTE) shall not be liable for errors or damages sustained in connection with the delivery, use or performance of this document and the information contained herein. Provision of this document does not in any way constitute recommendation of product fitness for a specific purpose. In future publications, FTE may make changes to specifications and product descriptions at any time, without notice. Contact FTE or your distributor to obtain the latest specifications prior to placing your product order. U. S. Patent Nos: 6,490,037; 7,023,554; 7,227,639 and 7,265,822. Additional patents pending.

The FINN sensor is a low cost solution for detecting the color of light emitting diodes (LEDs). It is a combination of a photosensitive semiconductor and an optical filter. The filter allows light of a target wavelength (color) to pass through and blocks light of wavelengths outside the target color wavelength. The sensor produces current when excited by the target wavelength of light. The current creates a voltage across the bias resistor, which is measured by the target test system. The test is easy to adjust and maintain because it uses the tester resources that the test engineer is...

3. Expected Wavelengths Nominal Wavelength Red Orange Yellow Green Blue Any/Clear* Infrared Sensor Peak Sensitivity Red -TC3001 Red - TC3001 Green - TC2901 Green - TC2901 Blue - TC2801 Clear - TC8704* Infrared – TC8708 * TC8704 (Clear FINN ) provides intensity readings for all color LEDs, but is not used to distinguish colors. To understand the above chart only a few terms need to be defined. These definitions are suitable for this discussion, but oversimplified for optical physics. The Nominal Wavelength column gives typical wavelengths emitted by standard LEDs. The Sensor Peak Sensitivity...

4. Typical Readings Nominal Readings LED Color Red Orange Yellow Green Blue/White Readings are for new FINN® resistor values Red FINN 400mV 300mV 200mV Less than 50mV N/A 330k bias Green FINN® Less than 50mV Less than 50mV 200mV 300mV N/A 510k bias Blue FINN® Less than 50mV Less than 50mV Less than 50mV Less than 50mV 400mV 1.2Meg bias Please note that the typical readings listed here are for the new release of the FINNs with sensitivity enhancements. These readings will be slightly different from FINNs purchased prior to January 2002. 4.1. LED Distance Typical readings are taken at a...

4.4. Ambient Light With an unlit LED, ambient light should not produce more than a 50mV reading. If the ambient reading is higher, try reducing the ambient light by shading the test area or by ® moving the FINN closer to the LED. Ambient light is not usually a problem in in-circuit test fixtures with over-clamps. 4.5. Important Note for Green / Yellow Distinction If you are trying to detect the difference between green and yellow there must be no ambient light. 4.6. Low Readings If readings for the target LED color are lower, then: 1. The LED may not be illuminated properly 2. The sensor is...

5.3. LEDs emitting light to the side of the PCB “Use Part # TCxxxxVP” – Vertical FINN Recommended distances: Sensor lens to lens of LED: Minimum: 0.10” Maximum: 0.15” or more* *Depending on strength of light source and ambient light. Recommended clearance / milling: 0.25” minimum (side to side) 0.15” minimum (front to back) 0.50” minimum (leads to top/end) Sensor setup: - Align the center of the sensor’s active region with center of the LED lens. - There will be no compression of the probe. 5.4. HP Programming for Vertical FINN side of the PCB For the HP programmer only, the following...

5.5. LEDs emitting light perpendicular to the PCB SMT LEDs emitting light perpendicular to the surface of the PCB “ Use Part # TCxxxxRP ” – Right ® Angle FINN Recommended distances:  Sensor lens to top of LED: Minimum: 0.10” Maximum: 0.15” or more* *Depending on strength of light source and ambient light.  Sensor setup: - Seat topside probes so that a 0.250 stroke probe sits above the board 0.15 “ when engaged - Probe offsets from center of LED light source 1. +0.0625” one direction (p or n side probes) 2. -0.0625” one direction (p or n side probes) 5.6. HP Programming for Right Angle...

6. Drawings 6.1. TC2901VP –Vertical FINN 6.2. TC2901RP – Right Angle FINN

6.3. Sensor Detail Sensor dimensions provided are equivalent for both vertical and right angle styles as well as all color options. Our FINN sensors use QA Technologies 025-26 series probes. To obtain the appropriate sockets please contact any of the following companies. Company QA Technologies Everett Charles Technologies INGUN IDI Our product engineers are available to assist you with choosing the correct FINN product to fit your specific needs as well as to answer any technical questions you may have regarding installation and/or implementation. Please contact us at: Email:...

8. Revision History and Control 8.1. Rev A - January 2016  No part changes – changes to logo and layout for manual only. 8.2. Rev A - January 1999  Initial release