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Opto

Led Lite

Instruction Manual

Specialists in Fluoresence Microscopy - DESIGN TO INTEGRATION

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Summary of Contents for OptoLed Lite

Page 1: ...www cairn research co uk Free Phone 08453301267 UK only Tel 44 0 1795590140 Fax 44 0 1795594510 OptoLed Lite Instruction Manual Specialists in Fluoresence Microscopy DESIGN TO INTEGRATION ...

Page 2: ......

Page 3: ...on or fluorescence This is especially important with ULTRAVIOLET LEDs which will not appear bright to the human eye but can cause permanent damage if not used with care 2 Our standard LED heads have built in protection to avoid damage however if in any doubt then please check with Cairn as to the rated power of the supplied heads and use accordingly 3 The OptoLED is typically supplied in conjuncti...

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Page 5: ...Contents 1 Introduction 1 2 Installation Guide 3 Technical Summary 4 4 Specifications 6 5 Appendix 7 5 1 LED Head Connections 7 5 2 Overload Protection 8 6 Technical Support 11 ...

Page 6: ...higher transient current limit to be set By incorporating the protection setting components in each LED head they can be tailored to match the maximum safe levels for that type of LED In addition digital inputs are provided to switch the LED on and off with rise and fall times of just a few microseconds for faster requirements you will need the full OptoLED The operation of the unit will now be de...

Page 7: ...overridden CURRENT Control This control sets the LED drive current when the INT EXT switch on the front panel is in the INT ernal position otherwise control is via an external voltage The current can be set between 0 and 5A but the protection circuit in the LED head will usually limit maximum current LED ON Indicator This indicator is illuminated whenever the corresponding LED is on If it is lit a...

Page 8: ... logic level i e 0V or 5V input which determines whether the LED is on or off when in the EXT mode This input is at a logic low level by default if it isn t connected to a suitable drive signal EXT LEVEL This is an external analogue input for the LED drive level where the input range is 0 to 5V Each change in 1V corresponds to a change in 1A ROTARY DIN Socket This is an 8 pin locking DIN socket fo...

Page 9: ... around 1 2V for a standard red indicator LED Devices designed for shorter wavelengths tend to have higher thresholds of maybe around 2V or so and in spite of the fairly steep diode characteristic they may drop as much as 3 or 4V when driven at full power These figures are all for a single LED please note that some LEDs may actually consist of several devices in series in which case their operatin...

Page 10: ...heap and they can be destroyed without damaging the power supply then trial and error may be a perfectly acceptable way of exploring their safe operating limits Finally a few notes about the most suitable types of LED For general illumination purposes the more powerful types are clearly to be preferred However for microscope illumination the situation is rather different and in practice better res...

Page 11: ...output current 5A Response time to change in external analogue input 10usec External analogue control voltage range 0 to 5V Digital inputs TTL level 0V or 5V nominal Overload detection parameters set by components in the LED heads cut out duration during overload 1 sec nominal auto reset Page 6 ...

Page 12: ...include a feedback photodiode so only the pins indicated in bold are used The heads are interchangeable between the OptoLED and the OptoLED Lite with the extra functionality only being active if the full OptoLED heads are used with a full OptoLED controller Pin 6 Positive connection to the LED Pin 1 Negative ground connection to the LED Pin 4 Array signalling connection If this pin is connected to...

Page 13: ... calculations but is there to protect the comparator input and the other end of the RC network is connected to ground The other comparator input the reference input is connected to a 200mV internal reference input Overload is triggered as soon as the signal input at the comparator exceeds the reference input this cuts the power for about 1 second If the protection network is just a single resistor...

Page 14: ...00W for an array although that power can t be achieved in practice but the overload circuitry can in theory measure power levels of up to 100W For many LEDs the maximum drive specification may be given as a current rather than a power In such cases the voltage drop across the LED at its maximum rated current should be measured and then multiplied by the current to determine the equivalent power le...

Page 15: ...procedure for calculating C for a given time constant T is as follows First calculate Re which is given by R 1K in parallel with 100K in series with Rp i e Re 1 1 R 1K 1 100K Rp Then calculate the required value of C from C T Re These components are connected between pins 2 signal and 3 ground of the connector plug The orientation is unimportant but by convention it makes more sense to have the ca...

Page 16: ...chnical Support e mail tech cairn research co uk Web http www cairn research co uk Address Cairn Research Ltd Graveney Road Faversham Kent ME13 8UP Telephone 44 0 1795 590 140 Fax 44 0 1795 594 510 Page 11 ...

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