User`s manual

ProScale M150, M250 with LCD Digital Displays Page 9 of 48
Incremental Scale
each segment the system is absolute. However, crossing over a segment
joint now presents the ReadHead with information identical to what it read in
the previous segment. At this point the system must be able to recognize
that it has crossed a joint and therefore must add or subtract the value of 1
segment: 430mm. In fact, each time the ReadHead passes over a joint it
must keep track of how many segments it has passed, and in which direction.
This action is accomplished by the Display and is transparent to the operator.
What does all this mean? If the ReadHead remains on the same absolute
segment, it can have power removed, its position changed and power
restored without loss of position information. However, if power is removed
(ReadHead unplugged from Display or batteries removed from Display) and
the ReadHead passes over a segment joint, the transition will not be
recognized. When power is restored the system knows its absolute position
on the new segment, but does not know how many segments it has passed,
or in which direction. (Simply turning the Display off does NOT constitute
removing power. A small amount of power is still supplied to the ReadHead;
only the LCD is turned off.)
Displays provide the operator with a method to adjust the segment offset so
the system displays the correct reading at all times without loss of accuracy.
See Section 4 for additional information on Segment Offset Adjustment.
All Absolute (ABS) Scales have a “zigzag” pattern on a green laminate.
There may be a “SPLICE or JOINT” approximately every 430mm (17in.).
To shorten ProScale ABS Scales see:
http://www.proscale.com/other/absscalecut.htm
Incremental
Some older ProScale systems, such as the Model 100 and Model 200, as
well as other Accurate Technology products use Incremental technology. The
ReadHeads and Scales of different technologies are not compatible.
Incremental Scales have a repeating “bar” pattern on a colored laminate.
All ProScale Model 150 and Model 250 Systems Use Absolute (ABS) parts.
Absolute and Incremental Scales are not interchangeable.
See Section 7: SPARE PARTS for Scale Part Number information.
Absolute (ABS) Scale