Brookfield DV3T Rheometer - Manual (Page 70)

Brookfield Engineering Labs., Inc. Page 70 Manual No. M13-2100
Code The code is the numerical value used to select the spindle. This value
must be unique and can not be the same as a standard Brookfield
spindle. The acceptable range for Code is 100-199.
Name The Name is a unique value to describe the spindle. The Name will
be displayed in the Spindle field. The Name can be comprised of
alpha and numeric characters.
SMC The SMC (Spindle Multiplier Constant) is used to convert the measured
torque to viscosity. The acceptable range of SMC is 0.001 – 500.
The SMC value can be determined through the use of the Range
equation found in appendix D. Some experimentation with the spindle
and a calibrated viscosity standard is required.
Range (cP) = TK * SMC * 10,000/RPM
The Torque Constant (TK) can be found in Table D-2 in Appendix D.
SRC The SRC (Shear Rate Constant) is used to convert the set RPM to
shear rate and calculate Shear Stress. The acceptable range of SRC
is 0.001 – 500.
The SRC value can be determined if the shear rate characteristics of
the spindle geometry are known. Consult the Brookfield publication,
“More Solutions to Sticky Problems”, for a discussion about shear
rate and some recommended equations.
Shear Rate (1/s) = SRC * RPM
YMC The YMC (Yield Multiplier Constant) is used to convert the measured
torque to yield stress.
Speed List: The selection of Speed in Configure Viscosity Test can be done by using either a
number pad or a scroll list. (This choice is selected through the navigation button in
the Set Spindle screen.) When scroll list is selected, the speed entry is restricted to
the classic Brookfield speed sets for the LV and RV/HA/HB rheometers. The contents
of the scroll list are defined in the Speed List menu. Each speed can be individually
selected or deselected through the use of a check box. Select or deselect all speeds
by using the Select All check box. Select or deselect all LV (or RV/HA/HB) speeds
by using the Select All LV check box. The classic Brookfield speed sets are defined
below.
LV: 0.3, 0.6, 1.5, 3, 6, 12, 30, 60
RV/HA/HB: 0.5, 1.0, 2.0, 2.5, 4, 5, 10, 20, 50, 100
Additionally, a new speed can be added to the list by selecting the New Speed command
key at the bottom of the display. The New Speed must be selected within the range
of available speeds on the DV3T: 0.0 – 250 RPM.
Speed entry through the number pad is never restricted.
TIP: To ensure that the correct speed is always entered, create a test that is saved
to the DV3T memory.
TIP: The selection of speed can be restricted by User Log In. Use this restriction
combined with a saved test configuration to ensure that the correct speed
is always used for critical tests. See Section V.4.2 for details of Users and
Access.