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Handbook Ref No. MH096/Issue G

File Ref: PR450_G.doc

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Summary of Contents for PR450

Page 1: ...Handbook Ref No MH096 Issue G File Ref PR450_G doc ...

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Page 3: ...n 2 Specification 3 Operation 4 Irradiance Measurements 5 Cosine Angular Response 6 Calibration Description 7 Care and Maintenance 8 Optional Accessories 9 Block Diagram 10 Environmental Care Recycling and Disposal ...

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Page 5: ...ss filters are designed to give a spectral response closely matching the bilirubin phototherapy action spectrum Good blocking of the detectors response outside the bandpass ensures the radiometer does not measure non therapeutic light The cosine corrected diffuser input ensures accurate measurements where ever the light source Note The PR450 is NOT an ultra violet radiometer and should NOT be use ...

Page 6: ...p or photo therapy fluorescent lamp Accuracy Absolute calibration accuracy 7 5 traceable to NPL standards DISPLAY UNIT PR450X Controller 80C51 based 8bit micro processor with a 3 6864MHz clock Memory On board non volatile RAM for calibration factors and set up parameters Integration Time 0 33s Conversion Scale 17 bit Conversion Accuracy Measurement accuracy 1digit with a linearity error of 1 Displ...

Page 7: ...impact polystyrene Weight Approximately 270g Front Panel Controls ZERO Initiates a zero or background measurement Routine HOLD RUN Display is held at present reading until HOLD button is pressed again Power on off button Connector 8 pin mini DIN type detector connector 6 pin mini DIN type RS232 connector for factory use only ...

Page 8: ...sponse Refer Figure 1 Angular Response Accurately cosine corrected to Lambert s Cosine Law Maximum error is less than 5 from true response to 70 from normal incidence reference Section 5 Temperature Coefficient 0 3 C Amplifier Gain 5x10 5 V A Current to Frequency 0 0 5Mhz Linearity Error 1 across range Temperature Range Operation 10 to 60 C Storage 20 to 70 C Detector Housing Black anodised alumin...

Page 9: ...totherapy Radiometer Irradian Limited 5 continued DET201450 Detector Typical Spectral response 0 10 20 30 40 50 60 70 80 90 100 400 415 430 445 460 475 490 505 520 535 550 R e s p o n s e Wavelength nm Figure 1 ...

Page 10: ...ter amplifier is nulled periodically Place the cover over the detector Press and release the ZERO switch the display will momentarily show 4 The micro controller will now measure the amplifier offset and store this value in the non volatile memory All subsequent measurements will first have this offset subtracted before displaying the measurement At the end of the sequence the display will show 5 ...

Page 11: ... and if possible to know the spectrum of the light source In addition the radiometer should be calibrated to best suit the measurement conditions It may even be necessary to have more than one calibration factor for the same detector filter combination For most applications the measurement plane is horizontal and a cosine corrected diffuser is fitted to the front of the detector assembly If the wo...

Page 12: ...the cosine of the angle of light incident on the detector This comes from the fact that the projected area of any surface at an angle of i is proportional to cos i To ensure that the integration of light from all angles is correct the cosine diffuser matches the angular response so that response of the detector decreases with cos i as the angle between the source and detector increases from 0 to 9...

Page 13: ...h a spectroradiometer between 425 and 475nm The total integrated irradiance is then recorded and divided by the spectral range to give calibration in units of µW cm nm with the PR450 radiometer calibration adjusted to match the spectroradiometer iv Each spectroradiometric value in iii can be adjusted with the action spectrum to form a weighted irradiance with the PR450 set to match this Note the s...

Page 14: ...or alcohol to clean surfaces 2 The diffuser on each filter ring should be kept clean at all times 3 The radiometer is a precision instrument protect from shocks 4 Avoid supporting the detector by the multi core cable The following items are available from Irradian Leveling Plate Three adjustable feet and built in spirit bubble Extension cables ...

Page 15: ...hototherapy Radiometer Irradian Limited 11 Diffuser Filter Detector Amp v to f Counter µController Keypad Liquid Crystal Display Display Driver Detector Amplifier Micro Controlled Display Unit Non Volitile RAM ...

Page 16: ...ny of which can be recycled and reused Please remember to observe the local regulations that govern both the disposal of the packaging materials accompanying this product and any used batteries DO NOT DISPOSE OF THIS PRODUCT IN YOUR GENERAL WASTE BIN Please inform yourself about your local WEEE collection system which is available for electrical and electronic products that are marked with the sym...

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Page 20: ... 9 Elphinstone Road Telephone 44 0 1875 898 083 Tranent Facsimile 44 0 1875 616 528 East Lothian E mail info irradian co uk Scotland EH33 2LG Web www irradian co uk ...

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