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Retroreflection Measuring Unit RETRO 2000 (100 ft.)
Measurement of the coefficient of luminous intensity of retro reflectors according to
  • CIE Publ. No. 54.2-2001
  • DIN 67520
  • EN 471 High-visibility clothing
  • ECE regulations R 3, R 27, R 69, R 70, R 104 (at 30.5 m measuring distance)
  • SAE Standard J 594, J 774, J 943, J 2041
and similar standards
Projector
  • Projector with color temperature acc. to Standard Illuminant A
  • Measuring distance 100 ft. (30.5 m)
  • Projector aperture 48 mm diameter
  • Measuring field 10 in. (254 mm) diameter
  • Uniformity of illuminance < 5 %
  • Adjustable lamp socket
  • Lamp dimmer for visual control of filament position during adjustment of uniformity of illuminance
  • Luminous flux control via beam splitter, photometer head, and electronic circuit
  • Housing with adjusting screws to direct the illuminant axis to the reference point of the measuring object
  • Built-in power supply for 230 V, 50-60 Hz
Photometer head
  • Photometer head with Si-photoelement, fine approximation to the V(λ) function
  • Aperture 1 x 1/2 sq.in. (25 mm x 13 mm, corresponding to 2.9' x 1.4')
  • V(λ) match ≤ 3 % according to DIN 5032 part 6 and CIE Publ. No. 53 (1982)
  • Individual measuring protocol of the photometer head
  • Optical system and built-in baffles for straylight reduction
  • Precision operational amplifier with additional voltage/current converter to produce an impressed output current
  • Projector and photometer head are built in one housing and adjusted within the observation half-plane.
  • Device with motoric drive and absolute angle encoder system to position the photometer head to observation angles between 6' (0.1°) and 2° in steps of 0.001°
Electronic display and control unit
  • 3½-digit display of measuring values
  • Display range 0.1 mcd/lx (last digit) to 199 900 mcd/lx (maximum)
  • For samples with a size of 10 x 10 cm, the corresponding range of the coefficient of retroreflection is R' = 0.01 - 19 990 cd/lx/m2
  • Range selection automatically or manually
  • Resolution 0.05 % of maximum in the selected range
  • Absolute measuring error < ± 1.5 % ± 1 digit against PTB standard at Standard Illuminant A
  • Repeatability error < ± 0.2 % ± 1 digit
  • Linearity error < ± 0.15 % ± 1 digit
  • Digital display for observation angles with resolution of 0.001°
  • Selection of observation angles manually or automatically via IEEE-488 Bus Interface (option)
  • Switch for projector lamp for zero-setting
  • Warning sign for luminous flux control
  • Analog output 0 - 2 V
  • Connection cable to projector
  • Built-in power supply for 230 V, 50-60 Hz
  • Calibration of RETRO 2000 (100 ft.), traceable to PTB standard, with LMT calibration certificate
Illuminance meter POCKET-LUX 2
  • 4½-digit LED display
  • analog output 0-2 V
  • separate photometer head P 10 FC0 with 2 m connection cable
  • light sensitive surface 10 mm dia.
  • fine V(λ)-approximation
  • cos-correction
  • adapter for photometer head, battery pack, carrying case
  • calibration, traceable to PTB standard, with LMT calibration certificate
  • individual test report for V(λ)-approximation and cos-correction
  • class B according to DIN 5032 part 7
  • Version B display range 0.01 lx to 19 999 lx
Options
  • Measuring field 600 mm dia. instead of 254 mm diameter (for complete measurement of advance warning triangles)
  • Measuring distance 10 m or 24 m instead of 100 ft.
  • IEEE-488 Bus Interface, Listener and Talker, (instead of BCD output) to connect the retroreflection measuring unit to a computer
  • Power supplies for 115 V, 60 Hz, for projector as well as for electronic display and control unit (instead of 230 V)
  • Mounting base
  • Software LMT LIMES 2000
  • Goniometer
  • Installation and training
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