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Density
Input a density value for the sample to be tested. This value will be used to calculate viscosity when kinematic
viscosity units have been chosen for display (see Section V.3).
3.13 Running a test
A viscosity test is started by pressing the Run button on the Configure Viscosity Test screen. When Run is pressed,
the display will change to the Running Viscosity Test screen (see Figure 3-42). The Running Viscosity Test
screen provides information on the current measurement including: Torque, Viscosity, Shear Stress, Shear Rate,
Temperature and Speed.
Figure 3-42
Torque
Torque is the deflection of the Rheometer torque sensor. It is described as a 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-
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 dial reading from the AMETEK Brookfield Dial Reading Viscometer
or the % reading from AMETEK Brookfield Digital Viscometers (DV-E, DV-I, DV-II, DV-III).
Viscosity
Viscosity is calculated from the measured Torque based on the selected spindle and speed of rotation. The units of
viscosity are defined in the Global Settings section of the Settings Menu. If the Torque reading falls below 10%, the
labels in the data fields will flash to indicate an error condition.
Shear Stress
Shear Stress is calculated from the measured Torque based on the selected spindle. The units of shear stress are
defined in the Global Settings section of the Settings Menu. If the Torque reading falls below 10%, the labels in the
data fields will flash to indicate an error condition.
TIP: Shear Stress will be displayed as zero for spindles that do not have SRC values.
Shear Rate
Shear Rate is calculated from the selected speed based on the selected spindle.
TIP: Shear Rate will be displayed as zero for spindles that do not have SRC values.
Temperature
Temperature is the input value from a connected AMETEK Brookfield temperature probe. The DVNext is provided
with a DVP-94Y probe that can be inserted into the test sample or a water bath. The Cone/Plate version of the
DVNext can be utilized with a sample cup that includes an embedded temperature probe. Some AMETEK Brookfield
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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