Tektronix J1811, J1812, J1820, J1823, J1806 Reference manual
...
J1800 Series
LumaColor Photometer
Sensor Heads
Technical Reference
070-9017-03
Copyright E Tektronix, Inc. All rights reserved. T ektronix products are covered by U.S. and foreign patents, issued and
pending. Information in this publication supercedes that in all previously
published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
WARRANTY
Tektronix warrants that this product will be free from defects in materials and
workmanship for a period of one (1) year from the date of shipment. If any such product
proves defective during this warranty period, Tektronix, at its option, either will repair the
defective product without charge for parts and labor, or will provide a replacement in
exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the
defect before the expiration of the warranty period and make suitable arrangements for the
performance of service. Customer shall be responsible for packaging and shipping the
defective product to the service center designated by Tektronix, with shipping charges
prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to
a location within the country in which the Tektronix service center is located. Customer
shall be responsible for paying all shipping charges, duties, taxes, and any other charges for
products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or
improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish
service under this warranty a) to repair damage resulting from attempts by personnel other
than Tektronix representatives to install, repair or service the product; b) to repair damage
resulting from improper use or connection to incompatible equipment; or c) to service a
product that has been modified or integrated with other products when the effect of such
modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS
PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE
DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY
PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Table of Contents
General Safety Summary viii. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor Technical Information
J1803 Luminance Head 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking the J1803 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Characteristics 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Examples 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1805 LED Head 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking the J1805 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Characteristics 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED Measurements 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification 1–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1806 Radiance Head 1–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking the J1806 1–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Characteristics 1–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Examples 1–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification 1–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1810 Chromaticity Head 1–31. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking the J1810 1–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Characteristics 1–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Examples 1–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification 1–39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1811 Illuminance Head 1–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking the J1811 1–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Characteristics 1–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Illuminance Measurements 1–45. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1–47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification 1–49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LumaColor Photometer Sensor Heads
i
T able of Contents
J1812 Irradiance Head 1–51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking the J1812 1–52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Characteristics 1–52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Examples 1–52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1–58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification 1–59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1820 Chromaticity Head 1–61. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking the J1820 1–62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Characteristics 1–62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Examples 1–63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1–68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification 1–70. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
Maintenance 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation for Shipment 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replaceable Parts
Replaceable Parts 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering Information 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List 3–2. . . . . . . . . . . . . . . . . . . . . . . .
J1803 Replaceable Parts 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1805 Replaceable Parts 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1806 Replaceable Parts 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1810 Replaceable Parts 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1811 Replaceable Parts 3–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1812 Replaceable Parts 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J1820 Replaceable Parts 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
LumaColor Photometer Sensor Heads
Appendices
Appendix A: Photometry and Radiometry A–1. . . . . . . . . . . . . .
Photometric Relationships A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Photometric Formulas A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radiometric Relationships A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radiometric Formulas A–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CIE Photopic Curve A–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Chromaticity Reference B–1. . . . . . . . . . . . . . . . . .
The 1931 CIE Chromaticity Diagram B–2. . . . . . . . . . . . . . . . . . . .
The 1976 CIE-UCS Chromaticity Diagram B–6. . . . . . . . . . . . . . .
Spectral Tristimulus Values B–8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary and Index
T able of Contents
LumaColor Photometer Sensor Heads
iii
T able of Contents
List of Figures
Figure 1–1: The J1803 Luminance head 1–1. . . . . . . . . . . . . . . .
Figure 1–2: J1803 setup for display luminance
measurements 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–3: J1803 setup for luminance measurement of
an illuminated surface 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–4: Setup for verification of the photometer with
the J1803 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–5: The J1805 LED head 1–11. . . . . . . . . . . . . . . . . . . . . .
Figure 1–6: LED measurement geometry 1–13. . . . . . . . . . . . . . .
Figure 1–7: J1805 setup for LED luminous intensity
measurements 1–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–8: Setup for verification of the photometer
with the J1805 1–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–9: The J1806 Radiance head 1–21. . . . . . . . . . . . . . . . . .
Figure 1–10: J1806 setup for surface radiance
measurements 1–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–11: J1806 setup for crt display color balance 1–25. . . .
Figure 1–12: Setup for verification of the photometer
with the J1806 1–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–13: The J1810 Chromaticity head 1–31. . . . . . . . . . . . .
Figure 1–14: J1810 setup for display chromaticity
measurements 1–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–15: J1810 setup for light source
measurements 1–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–16: J1810 setup for chromaticity measurement
of an illuminated surface 1–36. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–17: Setup for verification of the J18
with the J1810 1–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–18: The J1811 Illuminance head 1–43. . . . . . . . . . . . . . .
iv
LumaColor Photometer Sensor Heads
T able of Contents
Figure 1–19: J1811 setup for illuminance
measurements 1–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–20: Setup for verification of the photometer
with the J1811 1–50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–21: The J1812 Irradiance head 1–51. . . . . . . . . . . . . . . .
Figure 1–22: J1812 setup for irradiance
measurements 1–53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–23: J1812 setup for laser measurements 1–54. . . . . . . .
Figure 1–24: J1812 fixture for led measurements 1–56. . . . . . . .
Figure 1–25: Setup for verification of the photometer
with the J1812 1–60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–26: The J1820 Chromaticity head 1–61. . . . . . . . . . . . .
Figure 1–27: J1820 setup for display chromaticity
measurements 1–64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–28: J1820 setup for light source
measurements 1–65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–29: J1820 setup for chromaticity measurement
of an illuminated surface 1–67. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–30: Setup for verification of the J17
with the J1820 1–71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–1: J1803 replaceable parts 3–5. . . . . . . . . . . . . . . . . . .
Figure 3–2: J1805 replaceable parts 3–7. . . . . . . . . . . . . . . . . . .
Figure 3–3: J1806 replaceable parts 3–9. . . . . . . . . . . . . . . . . . .
Figure 3–4: J1810 replaceable parts 3–11. . . . . . . . . . . . . . . . . . .
Figure 3–5: J1811 replaceable parts 3–13. . . . . . . . . . . . . . . . . . . .
Figure 3–6: J1812 replaceable parts 3–15. . . . . . . . . . . . . . . . . . .
Figure 3–7: J1820 replaceable parts 3–17. . . . . . . . . . . . . . . . . . .
LumaColor Photometer Sensor Heads
v
T able of Contents
Figure A–1: CIE photopic curve A–4. . . . . . . . . . . . . . . . . . . . . .
Figure B–1: The 1931 CIE chromaticity diagram B–3. . . . . . . .
Figure B–2: 1931 CIE chromaticity diagram showing
color temperature B–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure B–3: Correlated Color Temperature diagram B–5. . . . .
Figure B–4: 1976 CIE-UCS chromaticity diagram B–7. . . . . . .
Figure B–5: Spectral tristimulus values for equal
spectral power source
(CIE 1931 standard 2_ observer) B–8. . . . . . . . . . . . . . . . . . .
vi
LumaColor Photometer Sensor Heads
List of Tables
Table 1–1: J1803 performance characteristics 1–6. . . . . . . . . . .
Table 1–2: J1803 typical physical characteristics 1–6. . . . . . . .
Table 1–3: J1803 environmental characteristics 1–7. . . . . . . . .
Table 1–4: J1805 performance characteristics 1–16. . . . . . . . . . .
Table 1–5: J1805 typical physical characteristics 1–16. . . . . . . .
Table 1–6: J1805 environmental characteristics 1–17. . . . . . . . .
Table 1–7: J1806 performance characteristics 1–27. . . . . . . . . . .
Table 1–8: J1806 typical physical characteristics 1–27. . . . . . . .
Table 1–9: J1806 environmental characteristics 1–27. . . . . . . . .
Table 1–10: J1810 performance characteristics 1–38. . . . . . . . . .
Table 1–11: J1810 typical physical characteristics 1–38. . . . . . .
Table 1–12: J1810 environmental characteristics 1–39. . . . . . . .
Table 1–13: J1811 performance characteristics 1–47. . . . . . . . . .
Table 1–14: J1811 typical physical characteristics 1–47. . . . . . .
Table 1–15: J1811 environmental characteristics 1–48. . . . . . . .
Table 1–16: J1812 performance characteristics 1–58. . . . . . . . . .
Table 1–17: J1812 typical physical characteristics 1–58. . . . . . .
Table 1–18: J1812 environmental characteristics 1–58. . . . . . . .
Table 1–19: J1820 performance characteristics 1–68. . . . . . . . . .
Table 1–20: J1820 Typical physical characteristics 1–68. . . . . . .
Table 1–21: J1820 environmental characteristics 1–69. . . . . . . .
T able of Contents
Table B–1: Spectral tristimulus values for equal spectral
power source (CIE 1931 standard 2° observer) B–9. . . . . . .
LumaColor Photometer Sensor Heads
vii
General Safety Summary
Review the following safety precautions to avoid injury and prevent
damage to this product or any products connected to it.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the
system. Read the General Safety Summary in other system manuals
for warnings and cautions related to operating the system.
Injury Precautions
Do Not Operate in Wet/Damp Conditions
To avoid electric shock, do not operate this product in wet or damp
conditions.
Do Not Operate in Explosive Atmosphere
To avoid injury or fire hazard, do not operate this product in an
explosive atmosphere.
viii
Wear Eye Protection
To avoid eye injury, wear eye protection if there is a possibility of
exposure to high-intensity rays.
LumaColor Photometer Sensor Heads
Product Damage Precautions
Use Proper Power Source
Do not operate this product from a power source that applies more
than the voltage specified.
Do Not Operate With Suspected Failures
If you suspect there is damage to this product, have it inspected by
qualified service personnel.
Do Not Immerse in Liquids
Clean the probe using only a damp cloth. Refer to cleaning
instructions.
Safety Terms and Symbols
General Safety Summary
Terms in This Manual
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that
could result in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that
could result in damage to this product or other property.
LumaColor Photometer Sensor Heads
ix
General Safety Summary
Terms on the Product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you
read the marking.
WARNING indicates an injury hazard not immediately accessible as
you read the marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product
The following symbols may appear on the product:
DANGER
High Voltage
x
Protective Ground
(Earth) T erminal
ATTENTION
Refer to
Manual
Double
Insulated
LumaColor Photometer Sensor Heads
Preface
This is the Technical Reference manual for the J1800-series
sensor-heads for the J17 and J18 photometers. This manual contains
the installation, operation, specification, verification, and replaceable
parts information for all of the J1800-series sensor-heads.
Information concerning the operation of the J17 or J18 photometers
is located in the photometer Instruction Manuals.
This manual is organized in the following sequence:
H Safety Information
H Sensor T echnical Information
H Maintenance
H Replaceable Parts Lists
H Appendices
NOTE.
turning on the power. The photometer loads data from the
sensor-head at power-on. If you connect a new sensor-head to
the photometer while the power is on, any measurements you
take may be inaccurate.
Always connect the sensor-head to the photometer before
LumaColor Photometer Sensor Heads
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Preface
xii
LumaColor Photometer Sensor Heads
Sensor Technical Information Sensor Technical Information
J1803 Luminance Head
The J1803 Luminance Head is designed for use in making display or
lighting luminance measurements in cd/m2 (NITS) and footlamberts.
The J1803 features super-accurate correction (patent pending),
allowing measurement of spectrally differing light sources.
The J1803 and standard accessories are shown in Figure 1–1.
J1803
Luminance
head
Connects to LumaColor photometer
Figure 1–1: The J1803 Luminance head
Suction cup
Rubber retainer
LumaColor Photometer Sensor Heads
1–1
J1803 Luminance Head
Unpacking the J1803
The J1803 is shipped with the following items:
H J1803 luminance head
H T echnical Reference (this manual)
H Rubber retainer
H Suction cup
Refer to the Replaceable Parts section for ordering and part number
information.
Operating Characteristics
For surface luminance and display measurements, the J1803 field of
view must be completely and uniformly filled.
The J1803 has an acceptance angle of approximately eight degrees.
This corresponds to a 1.7-inch (43 mm) diameter circle at a distance
of one foot from the sensor. The diameter measured is proportionally
greater as distance increases.
1–2
As long as the entire acceptance angle is uniformly filled by the light
source, the sensor-to-surface distance is not critical, and the reading
will be the same regardless of distance.
The minimum viewing diameter of the J1803, using the suction cup
in contact with the surface to be measured, is approximately
0.5 inches (12.7 mm).
LumaColor Photometer Sensor Heads
Operating Examples
This section provides examples for taking measurements with
the J1803.
Display Luminance Measurements
T o take a display luminance measurement, follow these steps:
1. Cover the sensor head and connect it to the photometer.
2. Power on the photometer. Do not uncover the sensor head or
move its cable until the photometer self-test is complete.
3. Turn the monitor on and set the brightness and contrast settings.
4. Attach the rubber suction cup or retainer ring to the J1803 and
position the J1803 on the monitor. Refer to Figure 1–2.
Suction cup or retainer ring
J1803 Luminance Head
J1803
LumaColor photometer
Figure 1–2: J1803 setup for display luminance measurements
LumaColor Photometer Sensor Heads
Display screen
1–3
J1803 Luminance Head
5. Read the luminance value from the photometer display.
The luminance value is updated continuously.
Luminance Measurement of an Illuminated Surface
T o take a luminance measurement from an illuminated surface,
follow these steps:
1. Cover the sensor head and connect it to the photometer.
2. Power on the photometer. Do not uncover the sensor head or
move its cable until the self-test is complete.
3. Point the J1803 at the surface to be measured, at the desired
distance from the surface. Refer to Figure 1–3.
J1803
LumaColor photometer
8° acceptance angle
Area to be
measured
Figure 1–3: J1803 setup for luminance measurement of an illuminated
surface
4. Read the luminance value from the photometer display .
The luminance value is updated continuously.
1–4
LumaColor Photometer Sensor Heads
J1803 Luminance Head
NOTE. For accurate readings, position the J1803 so that the surface
to be measured uniformly fills the measurement field. The acceptance
angle of the J1803 head is 8°. See Operating Characteristics on
page 1–2.
Special Considerations
For accurate measurements of illuminated surfaces, do the following
when positioning the J1803 for measurements:
H Make sure that the area being viewed by the J1803 is uniformly
illuminated, and that the entire field of view of the J1803 is filled
by the surface you are measuring.
H Position the J1803 so that it does not shadow the surface being
measured. Shadowing will occur if the surface is being measured
from the direction of the illumination.
H Do not operate the head in direct contact with the surface.
Reflections may occur between the front surface of the
sensor-head and the surface to be measured. Placing the head too
close to the surface may also cause shadowing.
The suction cup or rubber retainer provides adequate space
between the sensor-head and the surface to prevent reflection on
backlighted surfaces.
LumaColor Photometer Sensor Heads
1–5
J1803 Luminance Head
Specifications
T ables 1–1 to 1–3 list the specifications of the J1803.
Table 1–1: J1803 performance characteristics
Characteristic Standard
Accuracy
(including non-linearity)
Spectral Response See Figure A–1 on page A–4.
Spectral Accuracy f1’ = <3% (DIN class A)
Acceptance Angle 8°
Table 1–2: J1803 typical physical characteristics
5% of reading ± 2 counts (Illuminant A at 150 cd/m2,
20_ C to 30_ C, <75% relative humidity)
(1.7 inch diameter at 1 foot; minimum area of 0.5 inches)
(43 mm diameter at 0.3 m; minimum area of 12.7 mm)
Characteristic Standard
Dimensions
(not including suction
cup)
Cable Length 3.5 feet (1.1 m)
Height: 1.3 inches (3.3 cm)
Width: 1.4 inches (3.6 cm)
Length: 3.0 inches (7.6 cm)
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LumaColor Photometer Sensor Heads
J1803 Luminance Head
Table 1–3: J1803 environmental characteristics
Characteristic Standard
Temperature Meets MIL Std 28800E Class 3
Nonoperating: –62° C to +85° C
Operating: –15° C to +55° C
Humidity 48 hours at 97% relative humidity
(30_ C to 60_ C)
Modified MIL Std 28800E
EMC Compliance Meets the intent of Directive 89/336/EEC for Electromagnetic
Compatibility when it is used with the product(s) stated in the
specifications table. Refer to the EMC specification published for
the stated products. May not meet the intent of the Directive if
used with other products.
FCC Compliance Emissions comply with FCC Code of Federal Regulations 47,
Part 15, Subpart B, Class A Limits.
LumaColor Photometer Sensor Heads
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J1803 Luminance Head
Performance Verification
Use this procedure to verify that the photometer and J1803 are
functioning correctly.
For best results, follow these guidelines:
H Hold the sensor steady while taking measurements.
H Make certain that the light source fills the sensor field of view.
To verify the photometer and the J1803 you will need the following:
H A diffuse light source, providing light with a known luminance
value, approximately illuminant “A.” The light source should be
traceable to NIST standards, with adequate accuracy to verify the
±5% luminance characteristic.
1. Cover the sensor head and connect it to the photometer.
2. Power on the photometer. The photometer will perform its
self-test, briefly displaying all elements on the display. Do not
uncover the sensor head or move its cable until the self-test is
complete.
1–8
3. Point the J1803 at the light source. Refer to Figure 1–4. Use the
following guidelines when positioning the J1803:
H For accurate readings, position the J1803 so that the
measurement field is entirely filled by the surface to be
measured. The acceptance angle of the J1803 is eight degrees.
H Make sure that the area being viewed by the J1803 is
uniformly illuminated, and that the J1803 entire field of view
is filled by the surface you are measuring.
H The J1803 should be perpendicular to the surface of the light
source.
H Operating the sensor-head in direct contact with the surface is
not recommended, because reflections may occur between the
front surface of the head and the surface to be measured. Use
the suction cup or the retainer ring to provide adequate
spacing to prevent reflections.
LumaColor Photometer Sensor Heads
J1803 Luminance Head
The distance from the J1803 to the light source is not critical,
provided the above guidelines are met. If the reading changes
when the distance is changed, verify that you are meeting the
position guidelines.
Suction cup or retainer ring
J1803
Display screen
LumaColor photometer
Figure 1–4: Setup for verification of the photometer with the J1803
4. Press the sensor-head onto the display and read the luminance
value. The luminance value is updated continuously. (If you want
to stop the display from updating, press the HOLD button.) For
accuracy , take several readings and average the results.
Luminance readings will be in cd/m2 by default. For readings in
footlamberts, press the UNITS button.
5. Verify that the reading on the photometer display is within ±5%
of the known luminance value of the light source.
LumaColor Photometer Sensor Heads
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J1803 Luminance Head
1–10
LumaColor Photometer Sensor Heads
J1805 LED Head
The J1805 LED Head is designed for measuring the light output of
red, yellow, green, and blue LEDs in candelas, millicandelas, or
microcandelas.
The J1805 features super-accurate correction for measurement of all
visible LED colors.
The J1805 and standard accessories are shown in Figure 1–5.
J1805 LED head
Rubber
retainer
LED adapter inserts
Connects to LumaColor photometer
Figure 1–5: The J1805 LED head
LumaColor Photometer Sensor Heads
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J1805 LED Head
Unpacking the J1805
The J1805 is shipped with the following items:
H J1805 LED head
H T echnical Reference (this manual)
H LED adapter inserts (0.120 inch and 0.200 inch)
(3 mm and 5.1 mm)
H Rubber retainer
Refer to the Replaceable Parts section for ordering and part number
information.
Operating Characteristics
Intercept Angle
When the emitting plane of the LED is located at the front surface of
the J1805, the J1805 samples an angle of 3° at the center of the LED
beam.
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Using the LED Adapter Inserts
Four LED adapters, of two different sizes, are supplied with the
J1805. T wo have a 0.120-inch opening for T1-size LEDs; the other
two have a 0.200-inch opening for T1
may be accommodated by drilling the supplied adapters for a larger
size, or by making 1-inch (2.54 cm) diameter wafers from sheet
metal and painting them flat black.
Note that the LED hole in each adapter is recessed on one side. This
allows measurement of both diffusing and transparent LEDs. A
diffusing LED has an effective emitting plane closer to its tip than a
transparent LED. Choose the side of the LED adapter that places the
effective emitting plane of the LED closest to the outside flat surface
of the J1805. (See Figure 1–6.)
Seat the LED flange squarely against the LED adapter to ensure that
the sensor is measuring the on-axis portion of the LED beam. This is
especially important for LEDs that have very narrow beam widths.
3
/4-size LEDs. Other LED sizes
LumaColor Photometer Sensor Heads
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