Brookfield DV-III Ultra Rheometer - Manual (Page 87)

Brookfield Engineering Laboratories, Inc. Page 87 Manual No. M98-211-E0912
IV.8.6.3 Test Results
Test Passed
When a yield test runs successfully, the resultant Yield Stress (Pa), the % Torque value at the time
of the yield and the Temperature at yield are printed.
Test (#5: Sample Tst) Complete
Yield Stress (Pa) = 726.36 % Torque @ Yield = 73.56 Temperature = 25.5C
In addition, the results are shown on the display as follows:
#5: Sample Tst S:71
TEST COMPLETE
%=73.56 TEMP=025.5
YIELD=0726.4 Pa
Figure IV-84
Test Failed
Some of the reasons a yield test may fail are as follows.
Under-Range Condition
Only yield measurements in the % Torque range from 10% to 100% will be accepted. If a Yield
Stress is reached before the % Torque value is 10%, an Under-Range error causes the test to end.
The following is sent to an attached printer:
Test (#5: Sample Tst) Complete
Test Failed = Under-range
The following screen is displayed:
#5: Sample Tst S:71
YIELD ERROR
UNDER-RANGE
PRESS ESC OR ENTER
Figure IV-85
Under-Range Error
The yield stress (Torque Reduction Value) is reached before the absolute % torque reaches 10%.
When a test is started, once the absolute torque is greater than zero (0), the second, third, and fourth
Delta Torques (also known as the Base Increment Torque) are averaged. The first three (3) Delta
Torques after 9% absolute torque is reached are also averaged. An under-range error occurs if the
second average falls below the first average by 15% or more.
Over-Range Condition
Only yield measurements in the % Torque range from 10% to 100% will be accepted. If Yield
Stress is not reached before the measured % Torque value reaches 100%, an Over-Range error
causes the test to end.
The following is sent to an attached printer:
Test (#5: Sample Tst) Complete
Test Failed = Over-range