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TIP: If the operator selects "Do not show this message again" within the Instructions message box, then
Instructions will no longer be displayed for any test. This condition can be reset to allow Instructions to be
displayed in the Display section of User Settings
.
TIP: Instructions can be viewed during the test by selecting instructions (more/less bar) in the View Test screen.
Save Path
Define the memory location (internal or USB Flash Drive) where the Test Results will be saved.
TIP: Selecting a data path can help to organize data storage in the internal memory of the DVNext. By preselecting
the data path, operators are directed to put the data from specific tests into specific areas.
TIP: If you select a data path that includes a USB Flash Drive location and the Flash Drive has been removed, an
error message will be displayed.
4.6 Running a Yield Test
A Yield Test is started by pressing the Run button on the Configure Yield Test screen. When Run is pressed, the
display will change to the Running Yield Test screen (see Figure 4-7).
Figure 4-7
The Running Yield Test screen provides information on the current measurement including: Delta Torque, Torque,
Stress, Strain, Temperature, and Speed.
Delta Torque
Delta Torque is the difference between the current %Torque value and the previous %Torque value. As the sample
approaches its yield point, the Delta Torque percentage should decrease. If the Torque Reduction for the test is
100%, the yield point occurs when the % decrease in Torque = 100.
Torque
Torque is the deflection of the Rheometer torque sensor. It is described as percent (%) and has a range of 0 – 100%.
The DVNext will provide measurement results within the stated accuracy provided the Torque reading is between 10
and 100%. If the torque reading falls below 10% the labels in the data fields will flash to indicate an error condition.
AMETEK Brookfield does not recommend that data be collected below 10% Torque however data collection is not
restricted.
TIP: Torque on the DVNext is equivalent to the % reading from the DV-III Ultra and the YR-1 Rheometer.
Stress
M19-2101 REVISION 2.0
D V N E X T R H E O M E T E R - O P E R AT I O N A L M A N U A L
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