USTER HVI 900 - Page 230

USTER® HVI 900 Instruction Manual
Uster Technologies, Inc. Chapter 10
Version 4.0 (1.99) Synthetic Fiber Testing - Page 10-18
For fibers cut to the same length, it is recommended that SL1% and
SL2% be set to the same value (for instance 2.5). For fibers that contain
a distribution of lengths, it is recommended that SL1% be 50.0 and
SL2% be 2.5.
4.5.2 910 Min Amount & 910 Max
Amount
These numbers define the minimum and maximum sample size to be
tested for each fiber. Because of the distinct optical properties of
various fibers, an amount of 200 does not denote the same sample size
for different fibers. Therefore, experience with a particular fiber is
necessary to determine the amount.
4.5.3 Break Amount
This number represents the amount of fiber to be broken. As with 910
Min and Max Amounts, because of the distinct optical properties of
various fibers, the same number (such as 100) does not denote the
same mass for different fibers.
A value of 100 should be used as an initial value and the sample
tested. The breaking force should be observed, and the break amount
adjusted so that the breaking force is in the 30 to 60 pound range.
4.5.4 # Break Points
If you change the number of Break Points (220 max), the motors will be
re-loaded when you exit the STATUS MENU. The break points determine
the travel of the breaker system, and thus, the measurable elongation.
A large value will allow you to measure high elongations, but will
require additional time in the measurement test cycle.