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Irradian L203, User Handbook Manual, Page: 3 / 32

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Irradian L203 User Handbook Manual Download Page 3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Introduction 

 

 

2. Specification 

 

 

3. Operation 

 

 

4. Illuminance Measurements 

 

 

5. Luminance Measurements 

 

 

6. Battery Replacement 

 

 

7. Photopic Response 

 

 

8. Cosine Angular Response 

 

 

9. Calibration Description 

 

 

10. Block Diagram 

 

 

11. Programming via the RS232 Interface 

 

 

12. Environmental Care, Recycling and Disposal 

 

 

 

 

 

Handbook Update Log 

Issue 

Date 

Pages changed 

A 

19/03/99 

New Issue  

B 

19/12/99 

Update for V4 programming 

C 

14/06/00 

4,6,11,13,19-25: Update for V5 programming 

D 

04/01/01 

Version 5 update 

E 

06/02/02 

20: Programming update 

F 

22/05/02 

8: CRT head update 

G 

23/02/06 

7,17: Cosine response update 

H 

26/06/07 

WEEE update 

I 

09/07/09 

Contact details update 

J 

13/05/10 

Contents layout 

K 

15/07/10 

RS232 update 

L 

27/06/11 

Specification update 

Summary of Contents for L203

Page 1: ...Handbook Ref No MH063 Issue L File Ref L203 v5L doc ...

Page 2: ......

Page 3: ...ental Care Recycling and Disposal Handbook Update Log Issue Date Pages changed A 19 03 99 New Issue B 19 12 99 Update for V4 programming C 14 06 00 4 6 11 13 19 25 Update for V5 programming D 04 01 01 Version 5 update E 06 02 02 20 Programming update F 22 05 02 8 CRT head update G 23 02 06 7 17 Cosine response update H 26 06 07 WEEE update I 09 07 09 Contact details update J 13 05 10 Contents layo...

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Page 5: ... the CIE Vλ curve This precise colour correction gives high accuracy of photometric measurements from light sources with different spectral distributions see Calibration section For illuminance measurements the Irradian photopic filter ring with cosine corrected diffuser model CIE Cos 112 is fitted to the detector assembly This will integrate light from all sources in the hemisphere in front of th...

Page 6: ...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 from 1 to 100 000 lux 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 1200mAh Lithium Mang...

Page 7: ... 1 ii Luminance model L203 only Up to 6 full scale decades measuring from 0 to 1 9999 cd m 2 with CIE FOV 112 only 0 to 19 999 cd m 2 0 to 199 99 cd m 2 0 to 1999 9 cd m 2 0 to 19999 cd m 2 0 to 19999 x 10 cd m 2 Resolution 0 0001 cd m 2 on range 1 Resolution 0 001 cd m 2 with CIE FOV 101 Up to 6 full scale decades measuring from 0 to 1 9999 fL 0 to 19 999 fL 0 to 199 99 fL 0 to 1999 9 fL 0 to 199...

Page 8: ...essed 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 fact...

Page 9: ...otodiode Temperature Coefficient 0 10 C Amplifier Gain 10 9 V A to 10 3 V A Current to Frequency 0 0 5Mhz Linearity Error 1 from 1 to 100 000 lux Temperature Range Operation 20 to 60 C Storage 20 to 70 C Detector Housing Black anodised aluminium alloy housing Each optical accessories screws into the detector housing on a 1 125 x 20 T P I The detector amplifier is connected to the display unit via ...

Page 10: ...lack anodised aluminium alloy ring with screw thread 1 125 x 20 T P I Multiple coloured filter glasses individually selected for close matching to Vλ Specially profiled acrylic diffuser for high accuracy cosine angular response FIELD OF VIEW PROBE CIE FOV 112 Spectral Response Refer Figure 1 and Section 7 Angular Response Luminance measurements model L203 only The field of view is defined with FOV...

Page 11: ...7 continued CRT SCREEN LUMINANCE PROBE CIE FOV 101 Spectral Response Refer Figure 1 and Section 7 Design Aluminium tube 10 mm internal diameter with aperture 24 mm or 18 mm external diameter Rubber O ring tip Screw thread 1 1 8 x 20TPI ...

Page 12: ... photometer will now search for the optimum range on the detector amplifier A typical display is shown below An LED will illuminate indicating the units This will be the same units prior to the last power off 4 Press and release the UNITS switch to select the correct units required For illuminance measurements with the CIE Cos 112 photopic filter rings the correct units are either lux or fc For lu...

Page 13: ...witch on but the Units LED will remain unchanged To start 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 measuremen...

Page 14: ... 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 measurement will halt Units for integrated mea...

Page 15: ...ent The sources may be obvious lamps or windows or even walls or other reflecting surfaces Take care not to shadow the detector during all illuminance measurements 1 Set up the photometer as outlined in section 3 with the illuminance filter ring fitted and the units set to either lux or fc 2 Place the detector at the measuring point and record the value on the display If the light levels are low i...

Page 16: ... the expression below luminance L can be calculated by measuring the illuminance E on a surface and knowing the reflectance ρ of the surface L E ρ π where π is expressed in steradians x ρ lm m 2 π x ρ π lm str 1 m 2 x ρ π cd m 2 e g Calculate the luminance of a surface with a diffuse reflectance of ρ 0 9 when illuminated at a level of 100 lux L 100 0 9 3 14 cd m 2 28 7 cd m 2 Luminance can also be...

Page 17: ...cted light Luminance is independent of the measuring distance for a uniform Lambertian infinite sized source because the sampled area increase cancels the inverse square law losses For luminance measurements of small areas it may be preferable to use the Irradian Spot measuring Unit model SMU 203 as the reflex viewing optics allows the user to determine the precise measurement area 1 Set up the ph...

Page 18: ...compartment on the back of the photometer and pull out the battery Disconnect from the battery clip 3 Replace with a Lithium Manganese size PP3 9 volt battery 4 Place battery inside compartment and slide cover closed 5 Note it will be necessary to switch on and off the photometer before normal operation will commence ...

Page 19: ...se SD222 CIE Cos 112 Relative Response Figure 1 Photometers which do not closely match the response are often supplied with correction factors for different types of lamps and light sources This means that the user has to identify the type of source being measured and correct the meter reading This procedure becomes more unreliable when sources are mixed for example office lighting mixed with dayl...

Page 20: ...on the detector To ensure that the integration of light from all angles is correct the cosine diffuser fitted to the front of the filter ring is profiled such that the angular response of the detector decreases with Cos i as the angle between the source and detector increases from 0 to 90 CIE Cos 112 True Cosine Response Figure 2 Irradian s cosine diffusers are corrected to match the cosine respon...

Page 21: ...temperature 2855K 50K and for luminance using a highly uniform integrating sphere source of colour temperature 2600K 50K Irradian estimates that the absolute accuracy error in calibration of each L203 and L203 LUX photometer is 5 for a source of illuminant A at normal incidence The errors mentioned in Sections 7 and 8 namely spectral response and cosine angular error are small for most application...

Page 22: ...n Limited L203 Photometer 18 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 23: ... mode Reset to autorange with R command U Toggle through possible units lux fc etc as applicable F Toggle through functions Average Integrate Max Min I Function reset H Toggles hold go Z Zeros light meter R Resets light meter B Toggles backlight Single letter commands Lowercase s Toggles data continuous stopped via the RS232 o Sends one reading via the RS232 ...

Page 24: ... 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 set up go to File Save As and save the settings When restarting the programme 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 programme with the correct ...

Page 25: ...rol Click OK to continue 7 Click the properties icon or select via the File Properties option to display the properties window 8 Select the Settings tab and Auto detect for the Emulation setting 9 Click the ASCII Set up button Enter 100 into Line delay box No other changes are necessary Click OK to return to the main window 10 Check the RS232 link integrity by typing the command o lowercase o in t...

Page 26: ... again to stop data transmission 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 photometer 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 ...

Page 27: ...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 32: ... 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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