Vertical Profile
Projector
PJ-A3005F 150

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PJ-A3005F 150
Mitutoyo
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Available on backorder

Catalogue

Projected image Inverted image
Protractor screen Effective diameter 12.4” / 315mm
Screen material Fine ground glass
Reference line Cross hair line
Angle display (LED) Resolution: 1° or 0.01° (switchable), Range: ±360°
Functions: Absolute/incremental mode switching, Zero Set
Projection lens Standard Accessory 10X (172-202
Magnification accuracy Contour illumination ±0.1% or les
Surface illumination ±0.15% or less
Contour illumination Light source Halogen bulb (24V, 150W)
Optical system Telecentric system
Functions Telecentric system
Surface illumination Light source Halogen bulb (24V, 150W
Optical system Vertical illumination with a half-reflection mirror
  XY range 6” x 2” (150 x 50mm)
Resolution .0001”/0.001mm
Measuring Unit Built-in linear scales
Table size 11.02×5.98”(280x152mm)
Effective table area 7.24×3.23”(184x82mm)
Max. workpiece height 4.07” (103.5mm)
Functions Zero-setting, ± directionswitching, SPC output
Power supply 120V AC, 50/60Hz
Mass 255 lbs. (116kg)
Standard accessories 10X projection lens set, masking shield, power cord, halogen bulb, fuse, grounding wire, allen wrench, vinyl cove
A 16.8” / 427mm

■ Erect Image and Inverted Image
An image of an object projected onto a screen is erect if it is orientated the same way as the object on the stage. If the image is reversed top to bottom, left to right and by movement with respect to the object on the stage (as shown in the figure below) it is referred to as an inverted image (also known as a reversed image, which is probably more accurate).

■ Magnification Accuracy
The magnification accuracy of a projector when using a certain lens is established by projecting an image of a reference object and comparing the size of the image of this object, as measured on the screen, with the expected size (calculated from the lens magnification, as marked) to produce a percentage magnification accuracy figure, as illustrated below. The reference object is often in the form of a small, graduated glass scale called a `stage micrometer’ or `standard scale’, and the projected image of this is measured with a larger glass scale known as a `reading scale’. (Note that magnification accuracy is not the same as measuring accuracy.)

ΔM(%): Magnification accuracy expressed as a percentage
of the nominal lens magnification
L : Length of the projected image of the reference object
measured on the screen
l: Length of the reference object
M : Magnification of the projection lens

■ Telecentric Optical System
An optical system based on the principle that the principal ray is aligned parallel to the optical axis by placing a lens stop on the focal point on the image side. Its functional feature is that the image will not vary in size though the image blurs as the object is shifted along the optical axis. For measuring projectors and measuring microscopes, an identical effect is obtained by placing a lamp filament at the focal point of a condenser lens instead of a lens stop so that the object is illuminated with parallel beams. (See the figure below.)

Working distance
Refers to the distance from the face of the projection lens to the surface of a workpiece in focus. It is represented by L in the diagram below.

■ Parallax error
When a reading scale is used to measure the size of a workpiece feature there is always a certain distance between the reading scale, which is laid on the top of the stage glass, and the projected image of the feature which is on the underneath surface. Unless the reading scale is always viewed from the same direction, ideally from directly above, the image will appear to shift against the reading scale graduations and thus cause a measurement error.