User Manual

Summary Color Brightness Test Data
April 2013 Page 18
Measurement Jig
A precision measurement jig was constructed
to provide precise alignment and positioning
of the illuminance heads and the focal plane
of the projector. The jig creates a relative
repeatability specification of +- 2mm for the
placement of the measurement heads in all
axis X,Y and Z. The Z accuracy of the
placement within the focal plane for all the
measurement heads is +- 2mm and the total
focal plane uncertainty based on possible
focus error is 6 mm. The jig also allows the
precise swapping of the CR-670 and the PR-
514 Illuminance heads at position 5. This
allows a control measurement to be taken at
the beginning of each experiment. The jig provides corner focus targets allowing the projector geometry to
be properly aligned to the jig. A laser center line is projected during setup to facilitate aligning the optical
axis of the projector perpendicular to the focal plane.
Focal Plane Area
Due to minor anomalies and deviations in each
projectors optics precise placement of all four corners in
an exact rectangle can be difficult or impossible to
achieve. This can cause inaccuracy in the calculation of
light output due to the need for a precise screen area
measurement. The focal plane targets in each of the
four corners of the jig have a precision x,y grid in 2mm
steps. This allows the experimenter to record the devia-
tion in x,y for each of the four corners. The
measurement software uses these values to calculate
the diagonals of the focal plane from which the actual
focal plane area is calculated for each individual trial.
This procedure is described in NISTIR 6657 and ICDM-
DMS 1.03a.
1. The White Brightness specification for these models was obtained from ProjectorCentral.com as the reported manufacturer's
specification.
2. The manufacturers in table one have not provided Color Light Output (Color Brightness) specifications. These models were
tested by third party laboratories in accordance with IDMS 15.4 in order to provide critical information to buyers.
3. Many manufacturers provide specifications for both White Light Output (White Brightness) and Color Light Output (Color
Brightness). Manufacturers publish specifications on product performance and are responsible for their legitimacy and
reliability. See manufacturer's websites or contact the manufacturer for details.
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