Brookfield DV-III Ultra Rheometer Manual do Utilizador descarregar pdf (Página 87)

Brookeld 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 rst 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 rst 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

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Brookfield DV-III Ultra Rheometer Manual do Utilizador Página 87