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Isolight Color User Manual rev1.1

1. 1 Make sure you are in the display mode If you are in menu mode press the left arrow key repeatedly to return to display mode 2 Press the up or down arrow keys until the average reading is displayed Using the LED indicators section 6 makes the job of setting the correct lighting levels and uniformity much easier at any distance from the chart 5 2 Measuring Illumination Color Each light sensor measures the full RGB color This allows the Isolight Color to measure not only the average illumination color but also color uniformity This is especially useful when lighting a scene with multiple light sources or lights whose color is not consistent such as LEDs The onboard LCD displays color information in two formats Yxy and correlated color temperature CCT The USB interface can also provide color information in Yuv format 5 2 1 Background Information on Color Some background information on color and these formats is useful to Known when each is useful or appropriate 2014 Peripheral Vision Inc 27 COS i ici SE Peripheral Vision Inc 5 2 1 1 CIEXYZ and Yxy The human eye has three types of color receptors Each detects either long red medium green or short blue wavelengths of light Color is thus most naturally represented as a set of three values Though much research and international consensus a set of standard spectral basis functions were defined to closely match average human color sensitivity These ba
2. e Normal wear and tear e Any Product opened or repaired by someone not authorized by PV e Any Product or part thereof damaged by misuse moisture liquids proximity or exposure to heat e Accident abuse non compliance with the instructions supplied with the Product neglect or misapplication e Physical damage to the surface of the Product e Any software that may accompany or be installed on the Product e Installation removal or maintenance of the Product or any costs related thereto To make a claim of a Defect the purchaser must contact PV during the Warranty Period at 408 588 1928 or via email at custsupport pv imaging com to explain the Defect and to obtain a RMA number Return Materials Authorization if necessary The Product must be returned during the Warranty Period along with an explanation of the Defect to the address provided to you by PV If a defect arises and a valid claim under this Limited Warranty is received by PV after the first one hundred eighty 180 days of the Warranty Period PV is entitled to charge the purchaser for reasonable shipping and handling costs made in connection with the repair or replacement of the Product Purchaser must comply with any other return procedures stipulated by PV if any This Limited Warranty gives the original purchaser specific legal rights Additional legal rights may vary from state to state and jurisdiction to jurisdiction If any part of this Limited Warranty is held to be i
3. 1 Setthe LED step time to a small fraction less than 1 of the estimated integration time e Typical integration times are 1 30sec to 1 1000sec e A0 33msms LED step time gives a detectable range of 1 30sec 100 LEDs to 1 3000 sec one LED 2 Capture an image 3 Count the number of LEDs 4 Multiply the number of lit LEDs by the LED step time O 2014 Peripheral Vision Inc 38 4 Peripheral Vision Inc ER t 0 0 ms t 1 0 ms Exposure starts here gt t 2 0ms t 3 0 ms t 4 0ms HE t 5 0 ms t 6 0 ms Exposure ends here s t 7 0 ms Figure 38 Example of measuring integration time with LED chaser 5 LEDs x 1 0 ms LED 5 0 ms exposure time Captured image 7 2 2 Measuring Frame Rate Still Shot to Shot Lag To measure video frame rate or still shot to shot time use the following procedure 1 Set the step time so that approximately 20 to 30 LEDs are visible in a single frame For 30fps video 33ms per frame the 1 0ms LED setting works well For 60fps video the 0 33ms LED setting is better 2 Capture several frames 3 Count the number of LEDs between the left most LED in the first frame to the left most LED in the second frame See the example in Figure 39 In the figure there are 18 LEDs between the left most LEDs in each frame 4 Multiple the LED spacing 18 LEDs in the example by the LED step time For the example the frame rate is 18 LEDs between frames x 1 0ms LE
4. Tested under standard A 2856K tungsten light Accuracy Tested under standard A Optical Specifications Chrominance Specification Detector type TBD 2856K tungsten light Value Conditions Three silicon photodiodes with color filters Spectral response TBD deviation from CIE xyz photopic curves fi method under tungsten A light Color measurement CCT 2 000K to 50 000K CCT is valid within approx 0 05 units from the Plankian blackbody radiator curve Resolution 0 25 Lux or 1 of reading whichever is greater Repeatability single channel TBD Tested under standard A 2856K tungsten light Channel to channel mismatch 2014 Peripheral Vision Inc lt 3 0 Typical Tested under standard A 51 AN A Peripheral Vision nc 2856K tungsten light Tested under standard Accuracy TBD 2856K tungsten light Electrical Specifications Specification Value Conditions Input voltage 3 5VDC to 9 0VDC Power requirements TBD W See note 3 Battery life TBD Hours See note 3 Mechanical Specifications Specification Value Conditions Dimensions 346mm x 295mm x 21mm 13 6in x 11 6in x 0 83in Mass without batteries 995 g Includes 6 AAA alkaline Mass with batteries 1065 g batteries Varies depending on svstem settings 2014 Peripheral Vision Inc 52 Se Peripheral Vision Inc Appendix
5. The system information screen can be displayed through the Menu gt System Setup gt System Information menuitem The firmware revision number firmware build number and device serial number are displayed These are useful when reporting problems or recording which device was used during testing O 2014 Peripheral Vision Inc 42 4 Peripheral Vision Inc 9 Remote Operation Your Isolight Color light meter can be remotely controlled via a serial over USB interface It appears as a COM port on Windows PCs and as a dev ttyUSB device on Linux systems The communication protocol details are 115200 baud 8 bits no parity one stop bit 8N1 Sending a BREAK signal triggers a hard reset of the MCU Command strings are terminated with a line feed LF character 0x0A The gt symbol is used as a command prompt Sent characters are not remotely echoed 9 1 Command Format All serial commands are in the form lt Command gt parameter lt LF gt For SET commands if successful the device will respond with OK lt LF gt For GET commands if successful the device will response with lt Command gt parameter response lt LF gt If the command is unsuccessful the system will return a brief error message 9 2 System Commands The following commands are for global system settings parameters Command Description Param Parameter Value Return Return Value Type Type IDN Query
6. lux menu item The LCD display should appear similar to Figure 31 The current target level is shown on the left side of the screen For reference the upper and lower tolerance levels are shown on the right side If the target brightness level is changed the tolerance levels are immediately updated Current target level Upper tolerance value Target value Lower tolerance value Figure 31 Target light level setting screen To change the current brightness target level use the up arrow to increase the target level and the down arrow to decrease it Pressing and holding either button causes the button to repeat with the repeat rate becoming faster the longer the button is held The size of the step increments scales with the target level l e when the target brightness level is small the steps are also small As the brightness target level increases the step size also increases O 2014 Peripheral Vision Inc 32 Saw SE Peripheral Vision Inc 6 4 Setting Brightness Tolerance There are two brightness tolerance modes the lux controlled mode and the percentage controlled mode The actual upper and lower target levels will be computed differently depending on whether the tolerance was most recently set in lux or percent By setting the brightness tolerance level in lux the upper and lower target levels will be computed by adding or subtracting the brightness tolerance level to the brightness target level This sets the lux c
7. 1 If this occurs the average and uniformity readings will not be correct and should be ignored O 2014 Peripheral Vision Inc 16 Se Peripheral Vision Inc Q 14 chart 15012232 OECF chart Figure 9 Examples of using non standard sized charts 1 Set both clips in the up position Follow the sequence in Figure 7 Push each clip down towards the light meter surface and hold there At the same time rotate the thumbwheel counter clockwise for the left clip clockwise for the right clip until a click is heard and felt The result should look like Figure 5a e Thislocks the clips flush with the chart area preventing the clips from interfering with the test chart 3 Place the test chart onto the chart shelf e Ensure that the chart bottom edge is captured securely between the shelf edge and the light meter chart area e Be careful that the test chart does not bend forward or tip out of the shelf edge If possible recline the light meter backwards or use the fold out legs to lean the light meter and chart backwards at a slight angle 3 3 Mounting the Light Meter The Isolight Color light meter can be mounted in test scenes many different ways on a tripod against a steel surface on the built in folding legs on hooks or a nail in a vertical surface such as a wall 3 3 1 Tripod Mounting There are two 20 tripod mounting threads one on the back and one on the bottom of the instrument Be careful not to tilt the
8. B Mechanical Drawings 290 mm 11 42 in de 346 mm 13 62 in 18 1 mm 0 71in 7 T 310 mm 12 20 in 70 155mmt6 10inj 7 18 1 mm 0 71 in i t e Y E N e E 8 3 c E E E 3 E A a LO O N Y Y Y 10 0 mm 0 39 in 30 0 mm 1 18 in gt lt 50 0 mm 1 97 in 254 mm 10 0 in Figure 42 Front view with dimensions 2014 Peripheral Vision Inc 53 R 18 0mm 0 71 in R 14 0mm 0 55 in R 10 0mm 0 39 in R 5 0mm 0 20 in 62 7 mm 2 47 in Se Peripheral Vision Inc 120 mm 4 72 in Y 18 1 mm 0 71 in 145 mm 5 71 in Figure 43 Rear view with dimensions 21 mm 0 83 in mA KA Figure 44 Bottom view with dimensions 2014 Peripheral Vision Inc b4 4 Peripheral Vision Inc Appendix C Warranty Peripheral Vision Inc PV warrants to the original purchaser of the Isolight Light Meter with which this Limited Warranty the Product is included that the Product will be free from defects in materials and workmanship under normal use Defects for a period of one 1 year from the date of purchase the Warranty Period During the Warranty Period the Product will be repaired or replaced at PV s choice without charge to you for parts or labor The Limited Warranty does not apply to
9. ES 3 Table ol Conte nis sorna 5 1 61011 A A A 9 1 1 ESAS id 9 2 A RS acto as 10 2 1 O ea eee ea aa ee nn Mia 10 2 2 Rear MIE Wisteria aide dde te nt On ne 10 2 3 DIS CE RE dali iia 11 A PP Ta a nad 12 3 1 Powering the Meter iii EKEKENIKENEENITKENENZENEnEnzEEnEEzT 12 ada Bator sta MON aaa 12 3 1 2 Using the Power Adalid 12 So USB power die nee 12 S l4 Tumin Power Oli ana sia do ed 13 3 2 HASTEN HA i ta ei 13 Sell Sing the Chan GIO S ss b till 13 3 2 2 USING standard Sized O ar ts se critico den ee lcd tite 16 9 29 USM Other Chart SIZES i SRE Nr ne 16 3 3 MOUNTING the Light Meter aiii tatin b a ant ni ne ane 17 Sol TOO MOUNINO i Sd a a gaye 17 3392 VIOUTHINO Madre ts a a d ia ta e teed l adt Ab a don sodda taddi on 17 3397 ADI TOP a 18 334A Mounting oma Walras a taka 18 4 Display Modes and Menus ccccccccssseeceeeeeeeeeeeeecsaeeeeeeeeseeeeceeeseeeeeeeeesseaeeeesseaseeeessaaeeeeessaasseeeeeesas 19 4 1 Data Display MOSS sn reste da sn kt 19 4 1 1 Average Brightness Reading sise 20 4 1 2 Average Color Temperature iii 20 41 91 Four Bronness Read inner Din oi f 20 4 1 4 Four Color Temperature ReadingS ss 20 4 1 5 Average Brightness and Color Level and U niformity 21 4 1 6 Detailed Brghthess Readings si ie ira i ir a anima gens 21 4 1 7 Detailed Color Temperature Readings ss 22 41 68 Sensor G romati itv REAGINGS ai a a ae tn a den 22 ALI SENSO BAS uiraa O 22
10. Light level Vellow Light level too low within correct range bright Figure 30 LED indicator displav colors The LED indicator ring brightness can be manuallv adjusted or set automaticallv In the auto mode the brightness is set so that the indicators are clearlv visible in ambient light but not so bright as to create light pollution or alter the behavior of the device under test See section 6 8 1 for information on adjusting the indicator ring brightness 6 1 Computing Illumination Uniformity The Isolight Color computes illumination nonuniformity with the following formula max Sensor Reading min Sensor Reading N ty X 100 IS mean Sensor Reading ki Perfectly uniform lighting will have 0 0 nonuniformitv By definition nonuniformitv values will always be between 0 and 400 The current nonuniformity is displayed in the detailed sensor readings section 4 1 4 and section 0 combination display modes 6 2 Choosing and Setting the Indicator Mode When setting up a test scene there are two types of lighting criteria 1 Make the lighting both uniform and a predetermined brightness E g 1000 lux 100 lux 2 Make the lighting uniform but the actual lighting brightness is not important Lighting uniformity is always important goal Achieving a specific light level may or may not be important The Isolight Color LED indicators provide modes for achieving either uniformity only or ach
11. Peripheral Vision Inc 11 Se Peripheral Vision Inc 3 Setting Up 3 1 Powering the Meter The Isolight Color light meter can be powered either by 6 AAA batteries the supplied DC power adapter or from USB power An internal circuit automatically selects the best power source from those available to minimize battery use either the internal batteries or the battery of a notebook computer powering over USB The power source priority order is 1 DC power adapter preferred supply 2 USB power 3 Battery power lowest priority The system will automatically switch between power sources without interrupting operation 3 1 1 Battery Installation The light meter uses six AAA LRO3 UM4 1 5V batteries To install the batteries first turn off the light meter Remove the two screws on each battery door with a Philips 0 screwdriver Insert the batteries with polarities as shown in Figure 4 Positive terminal Positive terminal Figure 4 Correct battery orientation For maximum battery life and safety please observe the following cautions Always use new batteries Never mix different battery types NiCd NiHM alkaline etc Never mix batteries from different manufacturers Never mix new and old batteries Remove batteries of the unit will not be used for an extended period 3 1 2 Using the Power Adapter To use DC power plug the supplied wall adapter into the power jack The power adapter is compatible with 90VAC t
12. lt mode gt Set the display Integer 0 Average reading n a None mode 1 4 corner readings 2 Detailed sensor readings 3 Sensor bars 4 Tolerance bars 5 LED Chaser settings 6 Combination displav SLCDBM Set LCD backlight Integer 0 Off n a None lt mode gt mode 1 Automatic 2 Low 3 Medium 4 High SLCDC Set LCD contrast Integer Oto7 n a None lt contrast gt O lowest contrast 7 highest contrast SLSUR Set light sensor Integer O 250ms n a None lt update update rate 1 500ms rate gt 2 1 0 sec 3 2 0 sec SLE lt enable gt Set local echo Integer O disable local echo n a When enabled all of serial characters characters received 1 enable local echo serial characters are echoed back to the host This is useful for interactive terminal sessions SPST Set power shutdown Integer 0 Always on n a None lt timeout gt time 1 10 minutes 2 20 minutes 3 30 minutes 4 1 hour 5 4 hours SV lt volume gt Set volume Integer 0 Off n a None 1 Low 2 Medium 3 High 9 3 Light Sensor Commands Table 10 System serial commands The following command s for reading luminance and color data 2014 Peripheral Vision Inc 44 LOS u e Peripheral Vision Inc Command Description Param Parameter Value Return Return value Type Type RLSCCT Read sensor Integer Sensor ID 0 to 3 Floating Sensor
13. none lt mode gt 1 All LEDs the same 2 Emphasize every 5th LED 3 Emphasize every 10th LED 4 Emphasize every 33rd LED SLCS Set LED chaser speed Integer 0 0 10 ms LED n a none lt speed gt 1 0 33 ms LED 2 1 0 ms LED 3 3 33 MS LED 4 10 0 ms LED 5 33 3 ms LED 6 100 0 ms LED 7 333 3 ms LED 8 1 0 sec LED Table 13 LED chaser serial commands 9 6 Serial Command Examples This section contains sample command sequences for reading and setting various device parameters 9 6 1 Read light sensors The following command sequence reads the current value of all four light sensors Sent command Isolight response RLSLX O lt LF gt RLSLX 0 100 0 lt LF gt RLSLX 1 lt LF gt RLSLX 0 101 0 lt LF gt RLSLX 2 lt LF gt RLSLX 0 99 0 lt LF gt RLSLX 3 lt LE gt RLSLX 0 102 0 lt LF gt 9 6 2 LCD Display Set the LCD to the four sensor bars mode and to HI brightness mode SDM 3 lt LF gt SLCDBM 4 lt LF gt 9 6 3 LED Indicator Set the target light level to 1000 Lux 10 red off yellow mode and auto brighiness OLILV 1000 0 lt 6B gt SITTOP VO CUELGE gt SIM 1 lt LF gt SS SIBM O lt LF gt O 2014 Peripheral Vision Inc 48 HE A SE Peripheral Vision Inc 9 6 4 LED Chaser Turn on the LED chaser and emphasize every tenth LED set step time to 1 0ms LED and brightness to auto SLCM 3 lt LF gt SLCS 2 lt LF gt SLCBM
14. on walls e The case is 18 gray with a matte finish to avoid disturbing auto exposure and auto white balance algorithms e All displays LCD keypad backlight LED indicators and LED chaser feature manual brightness level settings including an auto brightness mode e Flexible power standard USB DC adapter or 6 AAA batteries e Dimensions 13 6in x 11 6in x 0 8in 845mm x 295mm x 21mm 2014 Peripheral Vision Inc 9 Se Peripheral Vision Inc 2 System Description 2 1 Front Figure 1 shows the front view of the device Light Sensor 0 LED Indicator Ring Chart Clip Chart Mounting Area Light Sensor 2 LED Indicator Ring Preset Buttons 4 LED Chaser Display Bottom Y 20 Tripod Mounting Thread Ful 2 2 Rear View Figure 2 shows the device rear view 2014 Peripheral Vision Inc Figure 1 Front view 10 LCD Displav Light Sensor 1 LED Indicator Ring Chart Clip Alignment Fiducial Light Sensor 3 LED Indicator Ring Arrow Buttons LA Peripheral Vision Inc Kevhole Mounting Slots Mounting Magnets Optional Mounting Magnets Optional Back 20 Tripod Mounting Thread Battery Door Battery Door Finger Hole Finger tole Power Button s Folding Leg Folding Leg USB Port Power Jack Figure 2 Rear view 2 3 Side View Figure 3 shows the device right side Power Jack USB Port Power Button Chart Clip Thumbwheel Figure 3 Right side view O 2014
15. point CCT color target color target in level in Kelvin Kelvin Depending on the indicator mode the target level may be Static set by the user or dynamically calculated tolerance only mode GICCTL Get indicator n a None Floating Current lower current CCT point tolerance color CCT color lower threshold in Kelvin tolerance level in Kelvin 2014 Peripheral Vision Inc 45 KON Peripheral Vision Inc Command Description Param Parameter Value Return Return value Type Type GICCTU Get indicator n a None Floating Current upper current CCT point tolerance color CCT color upper threshold in Kelvin tolerance level in Kelvin GILTLV Get indicator n a None Integer Same as SILTLV luminance command target level in Lux GILCTC Get indicator n a None Floating Returns the current current target point target level level in Lux Depending on the indicator mode the target level may be Static set by the user or dynamically calculated tolerance only mode GILCTL Get indicator n a None Floating Current lower luminance point tolerance luminance current lower threshold in Lux tolerance level in Lux GILTTX Get indicator n a None Integer Same as SILTTX luminance command tolerance level in Lux GILTTP Get indicator n a None Integer Same as SILTTP luminance command tolerance level in percent GILCTU Get indicator n a None Floating Current upper luminance point luminance tole
16. s current lt channel gt correlated color point correlated color temperature temperature RLSLX Read light level in Integer Sensor ID 0 to 3 Floating Sensor s current lt channel gt lux point reading in lux RLSYUV Read sensor color in Integer Sensor ID 0 to 3 Three Sensor s current lt channel gt Yuv coordinates comma reading in in separated Yuv floating point coordinates Y values is reported in lux RLSYXY Read sensor color in Integer Sensor ID 0 to 3 Three Sensor s current lt channel gt Yxy coordinates comma reading in Yxy separated coordinates Y floating point is reported in lux values Table 11 Light sensor luminance and color serial commands 9 4 LED Indicator Commands The following commands for setting the LED indicator target levels tolerances and operating modes Command Description Param Parameter Value Return Return value Type Type GIAM Get indicator n a none Integer Same as SIAM audio mode command GIBM Get indicator n a none Integer Same as SIBM brightness command mode GIM Get indicator n a none Integer Same as SIM mode command GIS Get indicator n a none Integer Same as SIS color scheme command GICTLV Get indicator n a None Integer Same as SICTLV color target command CCT level in Kelvin GICTTK Get indicator n a None Integer Same as SICTTK color target command CCT tolerance in Kelvin GICCTC Get indicator n a None Floating Returns the current current CCT
17. target levels are computed using the lux controlled mode To save the current setting and exit press the left arrow key 6 4 2 Setting Brightness Tolerance In Percent To set the brightness tolerance level in percent go to the Menu gt Set Brightness Target Levels gt Set Brightness Target Level menuitem The LCD display should appear similar to Figure 33 Notice that the current tolerance is set as the offset from the brightness target level so that the actual tolerance range is twice the width reported E g if the brightness tolerance level is set to 10 the actual target range is 20 wide Current tolerance Upper tolerance value Target value Lower tolerance value Figure 33 Setting the brightness tolerance in percent screen 2014 Peripheral Vision Inc 33 n e e Peripheral Vision Inc As with the lux setting entering the tolerance in percent screen only displays the current settings lt does not change to the percent controlled mode until either the up or down keys are pressed The upper and lower target values automatically update as the brightness tolerance level is changed Note that if the tolerance only indicator mode is selected the brighiness target level is computed dynamically from the average brightness level The upper and lower target levels will also change dynamically always updating as the average brightness level reading changes To save the current setting and exit press the left
18. 0ms 100 0 ms 1 1000 sec 1 10 sec 3 3 3 3MS 333 3 ms 1 333 sec 1 3 sec 11 1 10 0ms 1 0 sec 1 100 sec 1 0 sec 33 8 33 3ms 3 3 sec 1 33 sec 3 3 sec 111 100 0ms 10 0 sec 1 10 sec 10 0 sec 333 333 3ms 33 3 sec 1 3 sec 33 3 sec 1111 1 0 sec 100 sec 1 sec 100 sec 3333 Table 8 LED step and integration time relationships 7 1 2 Display Mode and Emphasis LEDs Many measurements require counting the number of lit LEDs in an image Counting upwards of 100 LEDs can be tedious and error prone To aid and simplify the process certain LEDs can be set to be extra bright to act as visual markers and to divide the lit LEDs into fixed size groups The extra bright LEDs are called emphasis LEDs Emphasis LEDs divide the chaser display into easily recognized groups making counting LEDs much easier Figure 36 shows a sample display with emphasis LEDs enabled every fifth LED O 2014 Peripheral Vision Inc 36 rea de SE Peripheral Vision Inc Emphasis LEDs EN L Figure 36 LED chaser displav elements Emphasis LEDs can be set to display every fifth tenth or 33 LED as shown in Figure 37 The 33 4 setting is useful for video applications where frame rates and integration times are multiples of 1 3 sec To adjust the LED step rate go to the Menu gt LED Chaser Settings gt Chaser Mode menu item and select the desired setting LED emphasis off Emphasis LED every 5th Emphasis LED every 10th Emphasis LED eve
19. A A D Re ee 51 Optical Specifications Luminance iii 51 Optical Specifications Chrominance iii 51 e Ones tentent a a 52 MechfianiCal Specijitatio nis is s i ei A lei delete diem teen ete ait 52 Appendix B Mechanical DFAWINOS einer attente ie cited 53 Appendice Ca Waran EE E do een net ne 55 imitation O NANAY er a da Ste als 56 Appendix D Document Revision History sn 57 2014 Peripheral Vision Inc 7 G LI Kd ex LUE Peripheral Vision Inc 1 Introduction Congratulations on your purchase of the Isolight Color light meter system Your Isolight Color light meter is designed to be the ideal companion for all kinds of image quality testing analysis and demonstrations The Isolight Color features four color sensors light level status LED indicator rings a 100 LED chaser display audio output a 4x40 LCD display and may other useful features 1 1 Features The system includes the following features e Four color sensors simultaneously measure incident illumination and color at each corner o Color sensors closely match the CIE XYZ curves for accurate color and luminance readings under most light sources Color can be reported on the build in display as Correlated color temperature CCT in Kelvin Yxy format with Y in lux and x and y in normalized CIEXYZ coordinates Color can also be reported over the USB port in Vuv format with Y in lux and u and v in CIELUV coordinates e All color sensors are cosin
20. Alto Toernee Bars aior N tt 23 Aki LED ChASErT Seting ada 23 112 COMPRA DI o ti 23 4 2 Mena Mode o e e a 23 4 3 Proset BUON Sarandi side actora anos 26 4 3 1 Saving and Recalling Preset Settings VU a A E 26 5 Measuring Brightness and Color iii 27 5 1 Measuring Scene Brightness sise 27 5 1 1 Measuring Scene Lighting Uniformity ss 27 5 2 Measuring Illumination Color siennes 27 5 2 1 Background Information on Color 27 2014 Peripheral Vision Inc 5 SD Peripheral Vision Inc 5 2 2 Isolight Color Display Modes des 30 5 3 setting Update Rate RSR a a aN 30 b IEED MAIcalorAlA IS zira a re a a i a a 31 6 1 Computing Illumination Un do 31 6 2 Choosing and Setting the Indicator Mode 31 6 3 Setting the Target Brightness Level ss 32 6 4 Setting BrighineSs POlaM Ce A tA hat a 33 6 4 1 Setting Brightness Tolerance In EUX 33 6 4 2 Setting Brightness Tolerance In Per cent i ssiiti is 33 6 5 Settings Color Temperature Target us A 34 6 6 Settings Color Temperature Tolerance ccccccccccccnnnccnnnnccononononnnnnonononanncnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnns 34 6 7 USES iS as 34 6 8 l EP IndicatotOPHOM St dadas 35 6 8 1 Indicator Brightness sise 35 6 8 2 Indicator Color SCHEMES tias 35 6083 Audio NACO f ii 35 T LEDS maser DISPlalsscstonotemendn dra nde loc ata ae desde ce 36 7 1 OS CHD OMR aa ne aq on da a D tee 36 Fall gt MEE SUC RAI i D ni tente diametre can el
21. D 18ms between frames 2014 Peripheral Vision Inc 39 DY Peripheral Vision Inc Frame 1 Frame 2 Frame 3 18 LEDs 18 LEDs Figure 39 Measuring frame rate 7 2 3 Detecting Integration Time Gaps It is possible to detect gaps between the end of one frame s integration time and the start of the next frame s integration time To detect such gaps look for missing LEDs between frames Figure 40 shows that three LEDs were not captured by either frame indicating a gap LEDs not captured in either image Frame 1 Figure 40 Detecting dropped frames 7 2 4 Measuring Frame Rate Jitter Frame rate jitter is a variation in frame rate from one frame to the next To detect frame rate jitter measure the frame rates between several frames Figure 41 Frame 1 Frame 2 Frame 3 Frame 4 18 LEDs 15 LEDs 21 LEDs Figure 41 Measuring frame rate jitter O 2014 Peripheral Vision Inc 40 Tar lt Peripheral Vision Inc 8 System Settings This section describes the various system settings 8 1 Sensor Update Rate The sensor update rate is programmable See Section 5 2 for information on choosing and setting the optimal update rate 8 2 Automatic Shut off Timer The Isolight Color provides an automatic shut off timer to preserve battery life The timer is reset any time a button is pressed or a serial command is received Once the timer expires the light meter turns off automatically The automatic shut o
22. Isolight Color Light Meter User Manual Rev 1 1 Peripheral Vision Inc 2118 Walsh Avenue Suite 220 Santa Clara CA 95050 408 588 1928 www pv imaging com 4 Peripheral Vision Inc Disclaimer Information in this user manual is subject to change without notice All information and specifications in this manual are provided AS IS AND WITH ALL FAULTS Any information or specification identified as provided by a third party is made available by PV in good faith but PV accepts no responsibility for the currency or accuracy of such information PV AND ITS SUPPLIERS HEREBY DISCLAIM ALL OTHER WARRANTIES AND CONDITIONS WITH RESPECT TO THIS MANUAL AND THE USE HEREOF WHETHER EXPRESS IMPLIED OR STATUTORY INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES DUTIES OR CONDITIONS OF MERCHANTABILITY NON INFRINGEMENT SATISFACTORY QUALITY FITNESS FORA PARTICULAR PURPOSE AND NONINFRINGEMENT ACCURACY OR COMPLETENESS If applicable law requires any implied warranties with respect to the user manual all such warranties are limited in duration to ninety 90 days Some states and or jurisdictions do not allow limitation on how long an implied warranty lasts so the above may not apply to you INNO CIRCUMSTANCE INCLUDING BUT NOT LIMITED TO NEGLIGENCE SHALL PV BE LIABLE TO ANY PARTY FOR ANY DIRECT INCIDENTAL SPECIAL CONSEQUENTIAL INDIRECT OR PUNITIVE DAMAGES NOR ANY LOSS OF PROFIT THAT RESULTS FROM THE USE OF OR THE INABILITY TO U
23. Q lt LF gt 2014 Peripheral Vision Inc 49 COs SE Peripheral Vision Inc 10 Bibliography Chromaticity n d Retrieved January 10 2014 from Wikipedia http en wikipedia org wiki Chromaticity Color Temperature amp Color Rendering Index DeMystified n d Retrieved January 10 2014 from http lowel tiffen com http lowel tiffen com edu color temperature and rendering demvstified html 2014 Peripheral Vision Inc 50 IS 4 Peripheral Vision Inc Appendix A Specifications General Specification Value Bronte 40x4 alphanumeric backlit TFT nel LCD Conditions Operating temperature 0 C to 40 C 32 F to 104 F Storage temperature 10 C to 50 C 14 F to 140 F Humidity Less than 80 RH Non condensing Optical Specifications General Specification Value Conditions 78 5 mm 10mm diameter Detector area disc Deviation from ideal cosine Angular response TBD response Range selection Fully automatic Measurement rate 0 25 to 2 0 sec Optical Specifications Luminance Specification Value Conditions TBD deviation from CIE f method under tungsten P photopic curve A light Luminance measurement range 0 1 Lux to 1 0MLux Resolution 0 25 Lux or 1 of reading whichever is greater Repeatability single channel Channel to channel mismatch TBD lt 3 0 Typical Tested under standard A 2856K tungsten light
24. SE THE INFORMATION INFORMATION REFERRED TO HEREIN EVEN IF PV OR A PV AUTHORIZED REPRESENTATIVE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE PLEASE READ THIS STATEMENT CAREFULLY SHOULD YOU NOT WISH TO BE BOUND OR ABIDE BY THIS DISCLAIMER AND ASSERTION OF RIGHTS THEN CEASE YOUR ACCESS TO THIS USER MANUAL IMMEDIATELY ANY ACCESS OF THIS USER MANUAL BY YOU SHALL BE DEEMED TO BE AN ACCEPTANCE OF THE ABOVE STATEMENT AND DISCLAIMER OF WARRANTIES AND CONDITIONS Copyright Copyright 2014 Peripheral Vision Inc PV Except as indicated all copyright in the information contained in this user manual is owned by PV All rights in such information are reserved No reproduction of any part of this user manual may be made for any commercial purpose nor shall it be modified or incorporated in any other work publication or website whether in hard copy or electronic format including posting to any other website All trade marks logos and brands displayed in this user manual are either owned or used under license by PV and must not be reproduced without the consent of PV and or its suppliers Peripheral Vision and Isolight are trademarks of Peripheral Vision Inc All other trademarks are the property of their respective owners Patents pending 2014 Peripheral Vision Inc 3 SD Peripheral Vision Inc 2014 Peripheral Vision Inc HE A SE Peripheral Vision Inc Table of Contents AP mA o A 3 COPY AS AI AE a EA A
25. Sensor 3 reading Figure 15 Four sensor readings display mode 4 1 4 Four Color Temperature Readings The four color temperature readings mode displays each sensor s color temperature in Kelvin in a double sized font This mode works well for high to medium resolution images and for verifying the color temperature at all four corners simultaneously O 2014 Peripheral Vision Inc 20 A m SE Peripheral Vision Inc Sensor O color Sensor 1 color temperature temperature Sensor 3 color Sensor 2 color temperature temperature Figure 16 Four color temperature readings display mode If any color temperature readings are invalid they are displayed as shown in Figure 17 Figure 17 Example of an invalid color temperature reading 4 1 5 Average Brightness and Color Level and Uniformity This mode displays the average brightness in lux the average color temperature in Kelvin and the percentage nonuniformity each This mode is useful for quickly evaluating or recording the overall lighting conditions Average Luminance luminance nonuniformity Color Average color nonuniformity temperature Figure 18 Average brightness and color levels and nonuniformity display mode 4 1 6 Detailed Brightness Readings The detailed brightness readings mode displays many useful parameters in a single screen The average light level in Lux Luminance nonuniformity in percent The current target minimum and maximum luminance values in Lu
26. Yes LED indicator mode settings Yes LED chaser settings Yes LCD backlight brightness mode and contrast No System volume No Table 2 System parameters saved by presets 4 3 1 Saving and Recalling Preset Settings To save the current settings press and hold the desired preset button for two seconds The device will play a success beep and the current system settings will be stored To recall saved settings press and quickly release the desired preset button If the preset contains previously saved settings the device will play a success beep and the saved settings will be immediately loaded and applied If no settings have been saved a warning beep will sound and the current settings will not change O 2014 Peripheral Vision Inc 26 4 Peripheral Vision Inc 5 Measuring Brightness and Color Having the correct lighting brightness color and uniformity is critical to obtaining the most accurate image quality test results Your Isolight Color light meter is designed to make setting up and verifying scene lighting quick accurate and simple The two most common goals for lighting are 1 achieve a specific lighting brightness and 2 to achieve uniform lighting across the test chart Many image quality tests require specific lighting levels and color such as low light tests or tests that mimic ambient room lighting Uneven lighting or color across a test chart can introduce significant measurement erro
27. arrow key 6 5 Settings Color Temperature Target To set the target color temperature level go to the Menu gt Set Color Target Levels gt Set Target Color K menuitem The LCD display should appear similar to Figure 31 The current target color temperature is shown on the left side of the screen For reference the upper and lower tolerance levels are shown on the right side If the target color temperature is changed the tolerance levels are immediately updated Current target color temperature Upper tolerance value Target value Lower tolerance value Figure 34 Color temperature target level setting screen To change the current color temperature use the up arrow to increase the target temperature and the down arrow to decrease it Pressing and holding either button causes the button to repeat with the repeat rate becoming faster the longer the button is held The step size is constant 6 6 Settings Color Temperature Tolerance To set the color temperature in Kelvin K go to the Menu gt Set Color Target Levels gt Set Color Tolerance K menu item The LCD display should appear similar to Figure 32 Notice that the color temperature tolerance is set as the offset from the color temperature target level So that the actual tolerance range is twice the width reported E g if the tolerance level is set to 100 K the actual target range is 200 K wide Current color tolerance level Upper tolerance value Target value Low
28. beep the LED chase can be used to measure audio video frame synchronization Table 7 lists some of the parameters that can be measured in still and video modes Parameter Still Video Integration time Y Y Shot to shot duration v y Frame to frame jitter Frame rate n a Y Dropped frames n a Y Audio video synchronization n a Y Auto exposure behavior Y Y Table 7 Parameters that can be measured with the LED chaser 7 1 Description The LED chaser display consists of 100 LEDs in a horizontal row Each LED is turned on one at a time in sequence from left to right Each LED remains on for the same preset duration When the sequence reaches the rightmost LED the sequence restarts again with the leftmost LED Since each LED is lit for a known time period they serve as stable time markers in captured images 7 1 1 LED Step Rate The LED step time is adjustable from 0 1ms LED to 1 0sec LED in half decade steps To adjust the LED step rate go to the Menu gt LED Chaser Settings gt LED Step Rate menu item and select the desired step rate Table 8 lists the step rate settings including the full display time for each LED step rate setting the upper and lower integration times and how many frames elapse at 30fps LED Step Full Display Integration Time Max Integration Frames per display Rate Period Resolution Time 30fps 0 1ms 10 0 ms 1 10000 sec 1 100 sec 0 33 0 33ms 33 3 ms 1 3333 sec 1 33 sec 1 1 1
29. ce Thus xy space is not useful for comparing colors in a perceptual sense In that case the Yu v color space is more suitable The Y component is the same as the Yxy space again representing the lighting brightness in lux The u v coordinates can be determined from the CIEXYZ values using the following formulae 4X FF 6Y gt ETSY 37 The transform between coordinate spaces is one to one and reversible 5 2 1 3 Correlated Color Temperature All objects emit electromagnetic radiation in a manner directly related to their temperature The simplest theoretical object is a perfectly black non reflecting object held as a constant Known temperature The entire spectrum of radiation from this black body is correlated to its temperature This correlated color temperature CCT is usually reported in degrees Kelvin K Thus a single temperature value can be used to describe the color of radiated light 2014 Peripheral Vision Inc 28 TX Peripheral Vision Inc Objects and normal room temperature approximately 300K emit only invisible infrared radiation But once an object is heated to about 800K it starts to emit light in the visible spectrum The first visible color is a deep red As the object s temperature is increased the emitted color changes from red to orange yellow white blue and eventually becomes invisible ultraviolet light Figure 28 shows the approximate blackbody color at various temperatures Tungst
30. de The chromaticity values are especially useful when working with light sources whose color isn t accurately described as a correlated color temperature Examples include fluorescent and LED light sources Due to the small font this mode is usually visible only in high resolution images 4 1 9 Sensor Bars Sensor 0 bar Bar graph origins Sensor 1 bar Sensor 0 reading Sensor 1 reading Sensor 2 reading Sensor 3 reading Sensor 2 bar Bar graph full scale range Sensor 3 bar Figure 22 Sensor bars display mode 2014 Peripheral Vision Inc 22 rs Sa Peripheral Vision Inc The sensor bars mode displays the current light levels in both numerical and graphical form The display is divided into four quadrants with each quadrant displaying the light level both numerically and as a bar graph The bar graphs extend from the center of the screen outwards to the left and right All bars share the same scale The current maximum scale range is displayed at the bottom center of the screen Sensor levels are also displayed numerically in the four corners 4 1 10 Tolerance Bars Target reading Target reading marker Bar graph origins marker Sensor 0 reading Sensor 1 reading Sensor 2 reading Sensor 3 reading Target reading Target reading marker marker Figure 23 Tolerance bars display mode Four bar graphs show how close each sensor is to the target level Arrows above and below each bar at the half way mark show the target bright
31. device ID n a none String Device identification string 2 Displays help n a none String Text help screen screen GBL Get battery level n a none Floating Current battery voltage point GDM Get display mode n a none Same as SDM command GFBN Get firmware build n a none String Text string identifying the number current build The build changes more frequently than the revision number GFR Get firmware n a none Floating Returns the major whole revision number point value and minor fractional part revision number GLCDBM Get LCD backlight n a none Integer Same as SLCDBM mode command GLCDC Get LCD contrast n a none Integer Same as SLCDC command GLE Get local echo n a none Integer Same as SLE command GLSUR Get light sensor n a none Integer Same as SLSUR update rate command GPST Get power n a none Integer Same as SPST shutdown time command 2014 Peripheral Vision Inc 43 IIA Peripheral Vision Inc v Command Description Param Parameter Value Return Return Value Type Type GSN Get device serial n a none Integer Returns device serial number number GV Get volume n a none Integer Same as SV command HELP Displays help n a none String Text help screen screen RESET Perform hard reset n a none n a Resets device to power on state RFD Restore factory n a none n a Restores all settings and defaults system states to factory defaults Erases all presets Also performs a hard reset SDM
32. device more than fifteen 15 degrees from the vertical position when using the bottom tripod mount At large tilt angles the tripod mount experiences very high stresses and may break or be damaged In these situations use the back tripod mount instead 3 3 2 Mounting Magnets Your Isolight Color may come equipped with powerful rare earth magnets mounted inside the back surface These magnets allow the instrument to be mounted on iron and steel surfaces such as light booth walls and white boards Rubber pads on the back surface prevent the instrument from sliding or shifting during use 2014 Peripheral Vision Inc 17 Se Peripheral Vision Inc The internal magnets may corrupt magnetic storage media such as credit cards desktop and notebook computer hard drives and floppy disks Please keep the light meter away from any susceptible devices 3 3 3 Table Top Use The Isolight Color is equipped with two fold out legs for table top use The legs are also ideal for use with plastic walled light booths or other small test scenes To open the legs place a finger in each recessed finger hole and unfold the legs until they are at right angles to the back surface Figure 10 shows how the legs should look when completely open Top View Back View Figure 10 Proper leg open position 3 3 4 Mounting on a Wall There are three keyhole slots on the back for hanging the instrument on a wall via hooks or nails Use the middle slot for mount
33. e CCT and xy coordinate readings are displayed normally However if the lighting has a very strong color cast e g bright red yellow green blue or if the lighting is very dim it may not be possible to accurately report xy color readings As described in section 5 2 1 3 the color temperature is also invalid for many bright colors In these cases the color information is not reported and a series of dashes is displayed instead See Figure 14 and Figure 17 for examples 5 3 Setting Update Rate When adjusting scene lighting the display and readouts should update as quickly as possible for maximum responsiveness However a rapidly changing display is difficult to photograph This is especially true under low light where long exposures are often required Table 3 shows a comparison of the advantages and disadvantages of fast and slow update rates Advantages Disadvantages Slow Easy to photograph in low light and Takes longer to see effects of lighting changes update with long exposure times less responsive rate Fast Lighting changes are quickly reported Rapidly changing displays can appear blurring update making it easier to quickly adjust and difficult to read in low light scenes or rate lighting to the desired level images with long exposure times Table 3 Comparison of sensor update rates Your Isolight allows you to select update rates from 250 ms to 2 0 seconds to achieve the optimal balance between responsiveness and d
34. e corrected e Sensors are auto ranging from 1 lux to 1Mlux No manual range setting is required e User selectable reading update rates from 0 25 s to 2 s let the user balance responsiveness with display stability e LED indicators around each light sensor show when the light levels are too low too high or within the user programmable range e A 100 LED chaser display enables time related measurements such as integration time frame rate and frame rate jitter and integration time gaps o Every 5 10 or 33 LED can be made brighter as a visual mark to make counting easier e Audio output synchronized to the LED chaser allows audio video synchronization measurement e A large backlit 4x40 character LCD display shows measurements and system state in a range of easy to read user selectable numerical and graphic formats e Four programmable preset buttons make saving and recalling setting quick and easy e AUSB port enables remote operation for automated control and data acquisition e Two retractable chart holder clips and a lipped shelf securely keep standard sized test charts in position o Chart holder clips retract flush into the body surface to prevent interference with large charts e Multiple mounting options o two 4 20 tripod mounting threads one on the bottom and one on the back o folding legs for table top use o integral magnets optional for mounting to magnetic surfaces such as light booth walls or white boards o Keyhole slots for mounting
35. e tee eme bata eee 36 fe Display Mode and Emphasis LEDS unam a 36 TA setting G aser Brightness ic A A eee 37 Fol Settinq Audio Market cr A A ete es 37 12 LED Chaser Measlr ments ini e E nr de 38 el Meastring Integration TIME aia ne te hein ao 38 7 2 2 Measuring Frame Rate Still Shot to Shot Lag ss 39 1 2 3 Detecting Integration Time Gaps Kisi eee ee 40 1 24 Meas nng Frame Rate ICN isos adorada cidos 40 A o PA 41 8 1 Sensor Update Ralte coin dd a A a p A ionids 41 8 2 Automatic Shut off Timer oooccnccccccoccnonccnnnncncnnnonnncnnnnnnnononnnnnnnnnnonnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnannennnninns 41 8 3 LOD BOGME S SES ne de eee ee cn tt a 41 8 4 LEBPContfa st A ins 41 8 5 VOM teca 41 8 6 System information is satira iris 42 9 Remote Operation cat 43 9 1 Sommand FO Ma tasas ion 43 9 2 NE A 43 9 3 light sensor Commands a lid 44 9 4 LED Indicatof GOMIMIANAS eri da A a des 45 9 5 BED G aser OMMANAS En nu At A a 47 9 6 Serial Gormimand EX amples ai tag a ta a at 48 96 11 Read light Sensor is ini ice chaste do 48 9 62 LOD B a ei Re eee ee RU Rs su 48 2 0 A a A O ey ee anne eee ee ere on Sn eu 48 See ye Ham cal A a eee ee eee eer or een a eee Eee eee ree 49 A Risin Moth aaa oi nl ha E 50 Appendix A Specifications pisi iapa o a A E a E a a 51 EE e A S soa D A E EE L A ET AL dd 51 2014 Peripheral Vision Inc 6 HE A SE Peripheral Vision Inc Optical Specifications General
36. en Noon Candle Halogen Househoig Sunlight Shade Skylight Infrared Embers Incandescent Fluorescent Monitors Ultraviolet 800K 1800 K 2800 K 3200 K 4300 4700 K 5600 K 6500 K 8000 K 12 20 000 K Figure 28 Approximate visible color as a function of color temperature Color Temperature amp Color Rendering Index DeMystified Figure 29 shows the line of CCT colors plotted on a CIEXYZ xy chromaticity diagram 0 9 0 8 700 0 0 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 Figure 29 Plot of correlated color temperature colors in x y chromaticity space Chromaticity Many real world light sources are blackbody radiators candles tungsten lights tungsten halogen or closely approximate the spectra of blackbody sources daylight and shade sources Photographers and the lighting industry have come to use CCT as a convenient way to describe the color of various light sources O 2014 Peripheral Vision Inc 29 SS SE Peripheral Vision Inc The color coordinates of many lights such LED and fluorescent lighting do not lie exactly on the black body line shown in Figure 29 If the distance to the line isn t too large such lights can still be assigned an approximate color temperature by finding the point on the blackbody curve closest to their actual chromaticity 5 2 2 Isolight Color Display Modes Section 4 1 describes the Isolight Color display modes many of which include color information Under most light sources th
37. er tolerance value Figure 35 Color temperature tolerance setting screen To save the current setting and exit press the left arrow key 6 7 Using Presets Remember that the Preset buttons can be used to save and recall brightness and color target and tolerance level settings Presets are especially useful when testing requires switching between several specific lighting conditions E g 10 Lux 300 Lux and 1000 Lux O 2014 Peripheral Vision Inc 34 Car e Peripheral Vision Inc 6 8 LED Indicator Options 6 8 1 Indicator Brightness The LED indicator brightness has for settings three manual levels low medium and high and automatic The automatic setting adjusts the LED indicator brightness based on the average lighting brightness level The LED brightness is set so that the indicators are clearly visible but not so bright as to cause significant light pollution Naturally there are limits to how dim and bright the LEDs can be set It may be difficult to see the indicators in very bright light To set the indicator brightness mode go to the Menu gt LED Indicator Setup gt Indicator Brightness menu item 6 8 2 Indicator Color Schemes There are three display schemes for indicating the current light level status From the Menu gt LED Indicator Setup gt Color Scheme menu item you can choose from e Red Green Yellow e Red Oft Yellow e Slow Red Flash Green Fast Red Flash Table 6 shows how each scheme displays
38. ff time can be set to the following Off never turn off 10 minutes 20 minutes 30 minutes 60 minutes 4 hours To set the shut off timer go to the Menu gt System Setup gt Auto Shut off menu item and select the desired time 8 3 LCD Brightness The LCD backlight brightness can be adjusted through the Menu gt System Setup gt LCD Brightness menu item The following settings are available e Off backlight always off e Auto backlight automatically adjusts to the current average light level In bright light the LCD backlight turns off e Low the minimum brightness e Medium e High the maximum brightness 8 4 LCD Contrast The LCD contrast can be adjusted through the Menu gt System Setup gt LCD Contrast menu item Contrast can be set from 0 to 7 with 3 being the default Contrast should not normally need to be adjusted except under temperature extremes or high viewing angles 8 5 Volume The global system volume is adjusted through the Menu gt System Setup Volume menu item The following settings are available Off all audio output is disabled regardless of other settings Low Medium High Disabling the volume does not change any other system settings such as LED Indicator or Chaser audio settings They will resume playing when the OFF setting is no longer selected in the Menu System Setup gt Volume menu 2014 Peripheral Vision Inc 41 Lex i ici SE Peripheral Vision Inc 8 6 System Information
39. gure 5 shows the five chart positions 2014 Peripheral Vision Inc 13 Se Peripheral Vision Inc a Clip in and locked b Clip in but unlocked Note an internal spring forces the clip to pop out to position c c Clip out and up d Clip out and down but unlocked e Clip down and locked Figure 5 Chart clip positions When the chart clips are retracted into the light meter surface follow the sequence in Figure 6 to extend them Note that in step 1 a locking detent may require that a little extra force be applied to unlock the chart clip 2014 Peripheral Vision Inc 14 Se Peripheral Vision Inc 1 Rotate thumb wheel counterclockwise The chart clip is locked in this position by a detent so firm pressure may be required to unlock it 2 An internal spring will force the chart clip to pop out 3 The chart clip is out and pointing up Figure 6 Extending the chart clip Red arrows denote user actions Blue arrows denote spring driven movements To retract the chart clip back into the light meter surface follow the sequence in Figure 7 Remember to press and hold the chart clip down in step 2 Step 3 may require extra force to lock the chart clip into position 1 Start with the chart clip in the up position 2 Press and hold the clip into the chart surface 3 While holding the chart clip down firmly rotate the thumb wheel clockwise until the chart clip locks into place A click sound w
40. ieving both absolute level and uniformity requirements The seven indicator modes are shown in Table 4 O 2014 Peripheral Vision Inc 31 Faw SE Peripheral Vision Inc Brightness Brightness Color Color Uniformity Indicator Mode Target Level Uniformity Target Tolerance Tolerance Level OFF Brightness level and X X tolerance Brightness tolerance X only Color level and X X tolerance Color tolerance only X Brightness and color x x x X level and tolerance Brighiness and color x X tolerance only Table 4 LED indicator modes In modes where the target brightness color levels are used the tolerance levels are constant l e the min and max tolerance levels are determined purely from the user supplied values In modes where only uniformity is measured e the absolute target level is ignored The min max tolerance levels are dynamically computed from the user supplied tolerance range and the average brightness color readings Table 5 shows which how the target level and tolerance are determined in each mode Indicator Mode Target Level Tolerance OFF None None Level and tolerance User selected User selected Tolerance only Current average light level User selected Table 5 How indicator target level and tolerance are determined 6 3 Setting the Target Brightness Level To set the target brightness level go to the Menu gt Set Brightness Target Levels gt Set Target Brightness Level
41. ill confirm the clips are locked in position Figure 7 Retracting the chart clip into the chart surface Red arrows denote user actions Blue arrows denote spring driven movements O 2014 Peripheral Vision Inc 15 LA Peripheral Vision Inc 1 Start with the chart clip out and up 2 Rotate the thumb wheel counter clockwise to lock the chart into position 3 If desired apply extra force to lock the clip into position The clips will make a click sound to confirm they are locked in position Figure 8 Locking a chart in place Red arrows denote user actions Blue arrows denote spring driven movements 3 2 2 Using Standard Sized Charts The Isolight Color light meter is designed for standard test charts sized 290mm x 204mm To install a standard test chart 1 Set both clips in the up position by rotating the thumbwheels Refer to Figure 6 2 Place the test chart onto the chart shelf e Ensure that the chart bottom edge is captured securely between the shelf edge and the light meter chart area 3 Rotate the clips into the down position or down and locked Refer to Figure 8 e Rotate the thumbwheels firmly until a click sound is heard and the clips lock into the down position 3 2 3 Using Other Chart Sizes It is possible to use test charts which are larger or smaller than the standard size Two examples are shown in Figure 9 Note that some charts may block the upper light sensors sensors 0 and
42. ing by a single nail Note that the instrument may tilt if bumped or pulled by either the USB or power cable To alleviate the problem use the two outer keyhole slots instead O 2014 Peripheral Vision Inc 18 4 Peripheral Vision Inc 4 Display Modes and Menus The LCD display has two modes data display mode and menu mode In the data display mode light sensor readings and other parameters are displayed and continuously updated In menu mode the user can quickly navigate view and adjust all device functions mode settings and parameters Table 1 details the functions of each arrow key in both display mode and menu mode Key Action in display Action in menu mode mode UP Previous menu item Previous menu item DOWN Next menu item Next menu item LEFT None Return to previous level If at top the level return to Display mode RIGHT Enter Menu mode Select item or enter submenu Table 1 Arrow key functions in each mode 4 1 Data Display Modes The twelve data display modes are shown in Figure 11 On power up the system defaults to the average brightness mode top mode gt Average Brightness Reading f Average Color Temperature f Four Brightness Readings f Four Color Temperature Readings f Average Brightness amp Color Level and Uniformity y Detailed Brightness Readings y Detailed Color Temperature Readings y Sensor Chromaticity Readings f Brightness Bar Graphs
43. ions do not allow limitation on how long an implied warranty lasts so the above may not apply to you This Limited Warranty may not be transferred to any other person 2014 Peripheral Vision Inc 55 SD Peripheral Vision Inc Limitation Of Warranty Neither Peripheral Vision Inc PV nor its suppliers shall be liable to Purchaser or to any third party for any indirect incidental consequential special or exemplary damages including in each case but not limited to damages for the inability to use the equipment or access data loss of data loss of business loss of profits business interruption or the like arising out of the use or inability to use the Product even in PV has been advised of the possibility of such damages Notwithstanding any damages that Purchaser or any third party might incur for any reason whatsoever including without limitation all damages referenced herein and all direct or general damages in contract or anything else the entire liability of PV and any of its suppliers shall be limited to the amount actually paid by the Purchaser for the Product The above exclusions or limitations of incidental or consequential damages are applicable only to the extent permitted by applicable law Notwithstanding the above neither PV s nor any of its suppliers liability for death or personal injury resulting from its own negligence shall be limited O 2014 Peripheral Vision Inc 56 4 Peripheral Visio
44. isplay stability To adjust the sensor update rate go to the Menu gt System Setup gt Sensor Update Rate menu item and select the desired rate e 250 ms e 500 ms e 1 0 seconds e 2 0 seconds Note that under low light conditions the light meter may slow the update rate to less than the desired setting This feature ensures that a reasonable signal to noise ratio and signal resolution is maintained The color error distance to the blackbody line must be less than 0 05 in CIELUV uv coordinate space 2014 Peripheral Vision Inc 30 IS AW gt Peripheral Vision Inc 6 LED Indicator Rings The LED indicator rings make it particularly easy to achieve and verify the correct scene lighting There are four LED indicator rings one around each light sensor Depending on the selected mode the LED indicator rings can monitor lighting brightness color or both The LED color and or flash pattern indicates whether the light falling on each sensor is too high too low or within the target property range s Figure 30 shows the four possible LED indicator states The meanings of each state vary with the display scheme and mode Red generally means too dark or color temperature too low Green means just right or within the target range Yellow means too bright or color temperature is too high See section 6 8 2 for more information on choosing and setting the display scheme Red Light level too Green
45. n Inc Appendix D Document Revision History Revision Date Changes 1 0 January 21 Initial release 2014 1 1 August 1 Various minor corrections and formatting changes 2014 O 2014 Peripheral Vision Inc 57
46. ness levels The current brightness levels are also displayed numerically in the four corners The large bars are clearly visible and convenient for adjusting lighting at distance 4 1 11 LED Chaser Settings The LED chaser display mode displays the LED chaser s current state including LED step and total duration emphasis mode and Beep mode This mode is useful for capturing the LED chaser state during video audio synchronization testing Figure 24 LED chaser display mode 4 1 12 Combination Display This mode displays the current light levels average and individual sensors current target level ranges LED chaser mode and battery voltage It is useful when monitoring both light levels and using LED chaser Figure 25 Combination display mode 4 2 Menu Mode All system settings are accessed through menus and submenus Figure 26 shows a sample menu screen On start up the device enters the data display mode To access the menus press the right arrow key To exit the menus and return to the data display mode repeatedly press the left arrow key O 2014 Peripheral Vision Inc 23 n e e Peripheral Vision Inc Menu options are selected with the four arrow keys The up and down keys scroll though the available menu options A scroll bar on the left side of the screen shows the currently selected menu item as well as showing how many menu items are above and below the current selection To select a menu option press the
47. nvalid or unenforceable the remainder of the Limited Warranty shall nonetheless remain in full force and effect This Limited Warranty is the only express warranty made by PV and is provided in lieu of any other express warranties or similar obligations if any created by any advertising documentation packaging or other communications Except for the Limited Warranty and to the maximum extent permitted by applicable law PV and its suppliers provide the Product AS IS AND WITH ALL FAULTS and hereby disclaim all other warranties and conditions whether express implied or statutory including but not limited to any implied warranties duties or conditions of merchantability non infringement quiet enjoyment system integration satisfactory quality fitness for a particular purpose reliability or availability accuracy or completeness or responses results workmanlike effort lack of viruses and reasonable care and skill all with regard to the Product and the provision of or failure to provide support or other services information software and related content through the Product or otherwise arising out of the use of the Product This exclusion does not apply to i any implied condition as to title and ii any implied warranty as to conformity with description If applicable law requires any implied warranties with respect to the Product all such warranties are limited in duration to ninety 90 days Some states and or jurisdict
48. o 240VAC 50Hz to 60Hz power mains 3 1 3 USB power The device may be successfully powered from some USB ports depending on the power level the port can provide O 2014 Peripheral Vision Inc 12 4 Peripheral Vision Inc gt 3 1 4 Turning Power On and Off To turn on power briefly press the power button The light meter will boot briefly display an power on information screen and then enter the default data display mode see section 4 1 for more information on display modes To turn off the meter press the power button again The light meter can be set to power off automatically after a period of inactivity See section 8 2 for more information on the auto power off feature and settings 3 2 Installing Charts The Isolight Color light meter is designed for use with both standard sized test charts as well as larger and smaller charts To keep test charts securely mounted and flat the light meter features a small shelf with a raised lip as well as two retractable thumb operated chart clips All charts will rest and be held in place on the shelf If using a standard sized chart the chart clips provide additional support and maintain chart flatness 3 2 1 Using the Chart Clips Two chart clips securely mount test charts in the chart area The clips have five positions The clip will rest in four of the five positions In the fifth position clip in but unlocked a spring forces the clip out of the light meter surface Fi
49. ontrolled tolerance mode lfthe brightness target level is subsequently changed the upper lower target levels will maintain the same offset in absolute lux terms If the lower level would become negative as a result it is clipped to zero Conversely if the brightness tolerance level is set in percent the tolerance mode changes to the percentage controlled mode The upper and lower brightness target levels will be computed by scaling the brightness target level rather than by adding subtracting If the brightness target level is changed the upper and lower values will maintain the same ratios relative to the brightness target level 6 4 1 Setting Brightness Tolerance In Lux To set the brightness target level in lux go to the Menu gt Set Brightness Target Levels gt Set Brightness Target Level lux menuitem The LCD display should appear similar to Figure 32 Notice that the current tolerance is set as the offset from the brightness target level so that the actual tolerance range is twice the width reported E g if the tolerance level is set to 100 lux the actual target range is 200 lux wide Current tolerance level Upper tolerance value Target value Lower tolerance value Figure 32 Setting the brightness tolerance in lux screen Entering the tolerance in lux screen only displays the current settings It does not immediately change to the lux controlled mode As soon as either the up or down keys are pressed new brightness
50. rance current threshold in Lux tolerance upper level in Lux SIAM lt mode gt Set indicator Integer O0 Off n a None audio mode 1 Beep when all sensors are in range or when any sensor becomes out of range SIBM lt mode gt Set indicator Integer 0 Auto n a None brightness 1 Low mode 2 Medium 3 High O 2014 Peripheral Vision Inc 46 Fe 2 4 Peripheral Vision Inc Command Description Param Parameter Value Return Return value Type Type SIM lt mode gt Set indicator Integer O0 Off n a None mode 1 Absolute luminance target level and tolerance 2 Luminance tolerance only 3 Absolute color target level and tolerance 4 Color tolerance only 5 Absolute target luminance and color level and tolerance 6 Luminance and color tolerance only SIS lt mode gt Set indicator Integer 0 Red Green Yellow n a None color scheme 1 Red Off Yellow 2 Slow red flash Green Fast red flash SICTLV lt color Set indicator Floating Set the target color CCT n a None temperature gt color CCT point correlated color target level in temperature level in Kelvin Kelvin SICTTK Set indicator Floating Set the target color CCT n a None lt temperature color CCT point correlated color tolerance gt tolerance level temperature tolerance in in Kelvin Kelvin SILTLV Set indicator Floating Set the target luminance n a None lt level gt luminance point level in Lu
51. right arrow key To exit any menu and return to the previous menu level press the left arrow key The menu structure is shown in Figure 27 Menu title Currently selected menu item Scroll bar Menu items Figure 26 Sample menu screen O 2014 Peripheral Vision Inc 24 pr 4 Peripheral Vision Inc O 2014 Peripheral Vision Inc gt g lg Set Audio Mode e gt Off i 4 Beep on enter exit all good Set Brightness Target lux gt Adjust Brightness Target Value Set Brightness A Tolerance lux gt Adjust Brightness Tolerance Value Set Brightness A j Tolerance gt Adjust Brightness Tolerance Value Set as Target Adjust Color Target Value Set Color Tolerance K Adjust Color Tolerance Value Set Audio Mode 4 mis Off Beep on enter exit all good Y Indicator Setup lt Set Indicator Mode 4 o OFF i Absolute Brightness Level amp Uniformity Brightness Uniformity Only Absol
52. rs In fact lighting errors can be much larger than errors from the equipment under test 5 1 Measuring Scene Brightness The easiest way to measure the overall scene brightness level is to use the average brightness reading display mode section 4 1 1 1 Make sure the Isolight Color is in the display mode If it is in menu mode press the left arrow key repeatedly to return to display mode 2 Press the up or down arrow keys until the average brightness reading is displayed 3 Place the Isolight in the scene and install the desired test chart 4 Adjust the scene lighting to achieve the desired light level When adjusting the lighting be sure not to obstruct the lighting by standing in front of the lights Note that the lighting will likely not yet be uniform 5 1 1 Measuring Scene Lighting Uniformity To measure the uniformity of the scene lighting the four brightness readings section 4 1 2 and sensor bars section 4 1 7 display modes are most useful The four readings display mode is most useful for verifying that each corner of the test chart is receiving the correct amount of light Since the readings are displayed in a larger font this mode is most useful when the lights are some distance away from the test chart The sensor bars mode is most useful for verifying that each chart corner is receiving the same level of light but is harder to use to achieve a specific light level since the light level readings are in a small font
53. ry 33rd Figure 37 Sample display at various emphasis LED settings 7 1 3 Setting Chaser Brightness The LED Chaser brightness can be set to four settings low medium high and auto The first three set the brightness to a fixed level The auto setting uses the average ambient light level reading to automatically adjust the brightness so that the chaser is visible but not so bright that the LEDs overpower the ambient light level creating light pollution 7 1 4 Setting Audio Markers In addition to the Emphasis LEDs the Isolight can generate audible beeps synchronized with the LED steps These audio markers are used during video testing to detect and measure audio video synchronization problems There are four Audio mode settings e OFF no sound is produced e Start Of Line a beep is generated for the left most LED only e Every Emphasis LED a beep is generated for each emphasis LED e Every LED a beep is generated every time a new LED lights To adjust the audio mode go to the Menu gt LED Chaser Settings gt Audio Mode menu item and select the desired setting Note that the system audio level determine the volume of the beeps If the system volume is set to OFF then no beeps are produced regardless of the audio mode setting Depending on the chaser step rate the duration of the actual beep tone varies Beeps are normally 10ms long If the step rate is long the beep plays for only part of the LED step
54. sis functions form the CIEXYZ color standard color space The CIEXYZ coordinate values denoted by the capital letters X Y and Z represent the perceived optical power of red green and blue light Note that the levels are weighted by the human eye response functions and are not measured in physical units such as W The XYZ values vary with both optical brightness and color This is inconvenient when one wishes to compare only color and ignore brightness To describe color independent of brightness the XYZ values are normalized as follows A X E EYES A Y IZ RF Y Z Z LR X Y Z The lowercase x y and z values are brightness normalized color coordinates The z coordinate is usually omitted since it can be recovered using the relationship Z 1 x y The xy values are useful for comparing colors Any two colors with the same xy coordinates should be perceived as identical regardless of their spectral content Brightness information is still often useful so the Y x and y values are usually reported together The Y value is a measure of the perceived brightness while the x and y provide color information The Isolight Color reports the Y value in lux while the x and y values are dimensionless ranging in value from 0 0 to 1 0 5 2 1 2 Yu v Colorspace While CIEXYZ space defines color in terms of the human eye spectral response it has some drawbacks Notably the perceived difference between any two colors varies greatly in xy spa
55. the current lighting state Brightness ne Within Brightness or Comments Indicator Scheme or pal too Range CCT too high Good for general work Verifies Red Green Yellow Red Green Yellow that the indicators are working since LEDs are always on Good for production testing since LEDs only turn on when Red Off Yellow Red OFF Yellow the measured light level is out of range Good for video monochrome l imaging or machine vision Slow Red Green Slowlv Rapidiv section aires a chose Fast Red flashes red Sec flashes red y display can be easier to detect than static colors Table 6 LED indicator display schemes 6 8 3 Audio Indicators In addition to the LED indicators the Isolight can generate a brief audible tone either when e all sensors become within range A happy tone will play e all sensors are within range and then one or more fall out of range A sad tone will play To enable or disable the Audio Indicator go to the Menu gt LED Indicator Setup gt Audio Mode menu item LEDs are set to the equivalent brightness of an approximately 50 reflective object O 2014 Peripheral Vision Inc 39 SD Peripheral Vision Inc 7 LED Chaser Display The LED chaser display is very useful for making a wide range of time related measurements Some of the possible measurements include integration time video frame rate and shot to shot delay When used with the synchronized audio
56. time If the step rate is too fast the beeps blend together into an indistinct solid tone Table 9 shows which combinations of step rate and emphasis mode settings produce clearly identifiable beeps and which result in an indistinct audio output A check mark v indicates clearly distinguishable beeps 2014 Peripheral Vision Inc 3 AN A Peripheral Vision Inc LED Step Rate Beep at Start of Line Beep Every Emphasis LED Beep Every LED 0 1ms Indistinct Indistinct Indistinct 0 33ms Y Depends on emphasis setting Indistinct 1 0ms Y Depends on emphasis setting Indistinct 3 3ms Y Depends on emphasis setting Indistinct 10 0ms Y Y Indistinct 33 3ms Y Y Y 100 0ms Y Y Y 333 3ms Y Y Y 1 0 sec 4 Y Y Table 9 Beep clarity vs LED step rate and emphasis setting 7 2 LED Chaser Measurements 7 2 1 Measuring Integration Time The most basic measurement is integration time e the length of time a camera is actually capturing an image Since each chaser LED is ON for a known period of time the integration time is found by capturing an image counting the number of lit LEDs and multiplying the number of LEDs by the LED step time Figure 38 illustrates the process In the figure the LED step time is set to 1 0ms LED The camera starts integrating at t 2 0ms and stops at t 7 0ms The captured image shows five lit LEDs indicating a 5 0ms integration time The general procedure is
57. ute Color and Uniformity Color Uniformity Only Absolute Brightness amp Color Level amp Uniformity Brightness amp Color Uniformity Only Set Indicator Colors lt _ _ Red Green Yellow Off Green Red Slow Red Green Fast Red Indicator Brightness Auto Low Medium High y LED Chaser Setup 44 bj Set Step Rate gt 0 1 ms i 0 33 ms 1 0ms 3 3 ms 10 0 ms 33 3 ms Set Display Mode lt gt Off All Dots the same Highlight every 5th Highlight every 10th Highlight every 33rd Set Audio Marker 4 OFF Beep on start of line Beep every highlight Highlight every 33rd LED Brightness lt gt Auto Low Medium High Y System Settings 4 mir PS pp update m 250ms 500 ms 1 0 sec 2 0 sec Auto Shutoff gt Always On Off after 10 min Off after 20 min Off after 30 min Off after 1 hour Off after 4 hours LCD Backlight Off Brightness Auto Low Medium High LCD Contrast lt gt O though 7 Volume gt OFF Low Medium High Figure 27 Menu structure 25 Gew 4 SE Peripheral Vision Inc 4 3 Preset Buttons Four preset buttons are provided for saving and restoring commonly used settings Preset settings are stored in non volatile memory and are retained even if power is lost Not all system settings are saved Table 2 shows which settings are saved by the presets System Parameter Saved with Presets Target brightness and color level and tolerance
58. x The readings of all four sensors in Lux Figure 19 Detailed brightness readings display mode The target minimum and maximum values reflect the current target values Target values are set by the user in level and tolerance mode and determined automatically in tolerance only mode 2014 Peripheral Vision Inc 21 n e e Peripheral Vision Inc Due to the small font the Detailed Readings mode is usually visible only in high resolution images 4 1 7 Detailed Color Temperature Readings The detailed color temperature readings mode displays many useful parameters in a single screen The average color temperature in Kelvin Color nonuniformity in percent The current color target minimum and maximum values in Kelvin The color temperature readings of all four sensors in Kelvin Figure 20 Detailed color temperature readings display mode The target minimum and maximum values reflect the current target values Target values are set by the user in level and tolerance mode and determined automatically in tolerance only mode Due to the small font this mode is usually visible only in high resolution images 4 1 8 Sensor Chromaticity Readings The sensor chromaticity readings mode provides the most detailed color readings of all For each sensor four values are displayed e Light level in Lux e Color temperature in Kelvin e Normalized CIE XYZ chromaticity coordinates x and y Figure 21 Four sensor readings display mo
59. x target level in Lux SILTTX Set indicator Floating Target tolerance n a None lt tolerance gt luminance point luminance in Lux tolerance level in Lux SILTTP Set indicator Floating Returns the current target n a None lt percent gt luminance point luminance level tolerance level Depending on the in percent indicator mode the target level may be static set by the user or dynamically calculated tolerance only mode Table 12 LED indicator target level and tolerance serial commands 9 5 LED Chaser Commands The following commands control the LED chaser s mode speed and other parameters Command Description Param Parameter Value Return Return value Type Type GLCAM Get LED chaser audio n a none Integer Same as SLCAM mode command GLCBM Get LED chaser n a none Integer Same as SLCBM brightness mode command GLCM Get LED chaser mode n a none Integer Same as SLCM command GLCS Get LED chaser speed n a none Integer Same as SLCS command SLCAM Set LED chaser audio Integer 0 Audio marker off n a none 2014 Peripheral Vision Inc 47 L mo um 4 Peripheral Vision Inc lt mode gt mode 1 Beep at the start of the line at LED 0 2 Beep every emphasized LED 3 Beep every LED SLCBM Set LED chaser Integer O Auto n a none lt mode gt brightness mode 1 Low 2 Medium 3 High SLCM Set LED chaser mode Integer 0 Off n a
60. y Brightness Tolerance Bar Graphs f LED Chaser Settings f Combination Display gt Figure 11 Data display modes and cycle order 2014 Peripheral Vision Inc 19 Faw SE Peripheral Vision Inc 4 1 1 Average Brightness Reading The average brightness reading mode displays the average of the four sensor readings in Lux in a large 4x sized font This mode is legible even at large distances and in low resolution images Figure 12 Average reading display mode 4 1 2 Average Color Temperature The average color temperature mode displays the average of the four sensor color temperature readings in Kelvin in a large 4x sized font This mode is legible even at large distances and in low resolution images Figure 13 Average color temperature reading display mode If any of the sensor color temperatures are invalid the average reading is also invalid Invalid readings are displayed as shown in Figure 14 Figure 14 Example of an invalid color temperature display 4 1 3 Four Brightness Readings The four brightness readings mode displays each sensor s light level in lux in a double sized font This mode works well for high to medium resolution images and for verifying the light level at all four corners simultaneously Sensor 0 reading Sensor 1 reading Sensor 2 reading

Isolight Color User Manual rev1.1

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