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Irradian PR203, User Handbook Manual, Page: 3 / 28

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Irradian PR203 User Handbook Manual Download Page 3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Introduction 

 

 

2. Specification 

 

 

3. Operation 

 

 

4. Spectral Irradiance Measurements 

 

 

5. Cosine Angular Response  

 

 

6. Calibration Description  

 

 

7. Care and Maintenance  

8. Battery Replacement 

 

 

9. Block Diagram 

 

 

10. Programming via the RS232 Interface 

 

 

11. Environmental Care, Recycling and Disposal 

 

 

Summary of Contents for PR203

Page 1: ...Handbook Ref No IH001 Issue D File Ref PR203 v5D doc ...

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Page 3: ...ration 4 Spectral Irradiance Measurements 5 Cosine Angular Response 6 Calibration Description 7 Care and Maintenance 8 Battery Replacement 9 Block Diagram 10 Programming via the RS232 Interface 11 Environmental Care Recycling and Disposal ...

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Page 5: ... 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 The radiometer comprises of a hand held display unit with micro processor control and a detector amplifier assembly with connecting cable and associated filters The sensor in the detector assembly is a silicon pho...

Page 6: ...wn Serial Interface Three wire RS232 serial interface 4800 baud no parity 1 stop bit Integration Time 0 33s Conversion Scale 17 bit Accuracy Measurement accuracy 1digit with a linearity error of 1 Display 4 digit LCD display Character height 10mm Display illumination A LED back light can be switched on to illuminate the display for readings in low ambient light situations Power Supply 9 volt PP3 t...

Page 7: ...to 4 full scale decades measuring from 0 to 19 999 µW cm 2 nm 0 to 199 99 µW cm 2 nm 0 to 1999 9 µW cm 2 nm 0 to 19999 µW cm 2 nm Resolution 0 001 µW cm 2 nm on range 1 Other ranges available on request Calibration Absolute calibration accuracy 7 5 to national standards ...

Page 8: ... pressed again Select to run or hold a special mode MODE Select between AVERAGE MIN MAX and INTEGRATE modes FUNCTION RESET Press to reset function values to zero RESET Press to return to normal measurement mode from manual range mode or special modes Note the display hold is not reset Power on off button Display backlight on off button Display backlight will switch off after a programmable delay f...

Page 9: ...er 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 10 6 V A to 10 3 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 10: ...radian Limited PR203 Radiometer 6 continued DET203450 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 11: ... An LED will illuminate indicating the units and another to indicate which light source is required This will be the same source prior to the last power off 4 Press and release the SOURCE bottom middle switch to select the correct source required For quartz tungsten halogen sources the correct setting is Halogen For irradiance measurements with a fluorescent source the correct setting is Fluorescn...

Page 12: ...rt an average sequence press and release the HOLD RUN switch Immediately the display will show a fluctuating signal reflecting the light source fluctuations After a short time the amplitude of the fluctuations will decrease and the display will begin to show a reading which represents the average light level during the period of the measurement At any time the averaging process can be halted by pr...

Page 13: ... measurement sequence or in the HOLD mode INTEGRATE For measurements of the integrated dosage or exposure press the MODE switch to select Integrate Press the RUN switch to start the measurement The display will now autorange as the dosage increases Note the detector amplifier will not autorange and as with Average measurements if the amplifier overloads the display will show 0 L and the measuremen...

Page 14: ...e detector and filter 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 and filter combination For most applications the measurement plane is horizontal and a cosine corrected diffuser is fitted to the front of the de...

Page 15: ...f 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 90 DET203450 ...

Page 16: ...d with a spectroradiometer between 425 and 475 nm The total integrated irradiance is then recorded and divided by the spectral range to give calibration in units of µW cm nm with the PR203 radiometer calibration adjusted to match the spectroradiometer iv Each spectroradiometric value in iii can be adjusted with the action spectrum to form a weighted spectral irradiance with the PR203 set to match ...

Page 17: ...ument protect from shocks 4 Avoid supporting the detector by the multi core cable 1 Switch off the radiometer before changing the battery 2 Slide open the battery compartment on the back of the radiometer and pull out the battery Disconnect from the battery clip 3 Replace with a size PP3 9 volt battery 4 Place battery inside compartment and slide cover closed 5 Note it will be necessary to switch ...

Page 18: ... Limited PR203 Radiometer 14 Diffuser Filter Detector Amp Gain Control v to f Counter µController Keypad Liquid Crystal Display Display Driver RS232 Driver LEDs Detector Amplifier Micro Controlled Display Unit ...

Page 19: ...ranges manual mode Reset to autorange with R command U Toggle through possible light sources Halogen Fluorescnt LED as applicable F Toggle through possible functions I Function reset H Toggles hold go Z Zeros light meter R Resets light meter B Toggles backlight s Sends data continuously via the RS232 o Sends one set of data via the RS232 ...

Page 20: ...nd R capital R 8 Type o for one packet of data and s for continuous data Type s to stop the data flow 9 To save the terminal setup go to File Save As and save the settings When restarting the program the settings can be reloaded with File Load filename Now actions 4 and 5 can be omitted Logging data continuously to a file using Microsoft TERMINAL EXE 1 Run the Terminal program with the correct set...

Page 21: ...on or select via the File Properties option to display the properties window 8 Select the Settings tab and select Auto detect for the Emulation setting 9 Click the ASCII Setup button Enter 100 into the box marked Line delay No other options are necessary Click on OK to return to the main window 10 Check the RS232 link by downloading a reading using the command o lowercase o This also allows auto d...

Page 22: ...r 3 Go to Transfer Capture Text Enter the filename for the stored data and the location to save to e g C HyperTerminal Capture txt 4 Press the start button to store all the readings transmitted from the radiometer in a file Capture txt The status bar will now show a highlighted Capture message The file is saved to the computer by selecting Transfer Capture Text Stop 5 Send the command s again via ...

Page 23: ...hich 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 symbol sho...

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Page 28: ... 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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