USTER®
HVI 900
Instruction Manual
Uster Technologies, Inc.
Chapter 5
Version 4.0 (1.99) Calibration - Page 5-7
4.4.2 Length Standard Value
The value for the metal length standard is listed on the standard that is
provided with the instrument. Do Not use a metal length standard
other than the one provided with the instrument. If, for some reason, a
new metal length standard is required - a service technician will use this
menu and enter the new value.
4.5 Length/Strength Setup
The Length/Strength Setup menu item is to be used by service
technicians only to perform the Lens to Break and Deflection Calibration,
and the Short Fiber setup. THE LENS TO BREAK AND THE
DEFLECTION CALIBRATION MUST BE DONE PRIOR TO
CALIBRATING FOR COTTON/SYNTHETIC FIBERS.
Cotton/Synthetic Fiber calibration is invalid if the Length
Standard or Lens to Break values are modified. Contact
an authorized Uster Technologies, Inc. Service Technician
to perform these setup features, if necessary.
4.6 Cotton Calibration
In order to better understand the theory behind the calibration
procedures, it is important to understand the instrument/software
principles of calibration. As described in the Appendix, Calibration
Cottons for the Uster Technologies HVI 900 System, calibration is
performed following engineering principles using hardware devices.
Adjustments are then made within the instrument to the unadjusted, raw
values through software manipulations. These adjustments cause the test
values to agree with designated values of laboratory cotton samples. In
this sense, the word “calibration” refers to the adjustment of
values
rather than to true calibration.
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