Installation manual
Operation Manual for LCD Digital Readouts Page 32 of 48
NON-LINEAR COMPENSATION
This function is used to enhance the basic accuracy of the ProScale system by
creating a table of correction values in the DRO based on known measurement
points along the length of the measurement system.
The compensation table consists of 126 elements. This should provide
adequate compensation for any length measurement system currently
manufactured by Accurate Technology.
For ProTable products purchased with the “Enhanced Accuracy” option, this
feature has already been enabled and set-up at the factory and it is not
necessary to repeat the initial error compensation procedure unless a
measuring system component of the ProTable has been replaced.
For ProScale Model 580 users, the initial error compensation procedure must
be performed by the end user on the ‘total measuring environment’ in order for
this function to be meaningful.
Before beginning an error compensation calibration, you will need to determine
how many points and the interval to calibrate. The DRO has a maximum
number of 126 correction points. The smaller the compensation interval (more
points) the smoother the calibration curve will be. Measurement standards
such as Gage Blocks in lengths from .50 inch to 10.0 inches should be used.
Keep in mind however, that you will need a sufficient number and selection of
standards to create the number of points you decide to correct.
As an example: For a measuring system 100 inches long the smallest interval
that can be corrected is .8 inches, (100 ÷ 126). This also means you will need
sufficient standards to create a known measurement point EVERY .8 inches. A
more realistic approach would be to use an interval of two or more inches and
calibrate fewer points. Keep in mind whatever interval you choose, you will
need a sufficient quantity of standards to replicate every point along the
measuring length.
It is IMPORTANT that the placement of the measurement standard(s) during
calibration be repeatable and that it be a useable point to make measurements
from during normal operation. This becomes even more critical as the surface
area used for normal measurements increases beyond the size (point) at which
the correction is made.
The following example uses 5 inch (interval) measurement standards and an
Accurate Technology ProTable as the measuring system under calibration.
Other applications would use a similar procedure.
1. Set Pr39 (Compensation Enable) to 1
2. Set Pr40 (Compensation Interval) to the length of the measurement
standards multiple that will be used during the calibration, i.e. 5.00”