LMT RETRO 2000 (100 ft.)

RETRO 2000 (100 ft.)

Retroreflection Measuring Unit RETRO 2000 (100 ft.)

Measurement of the coefficient of luminous intensity of retro reflectors according to

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

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