Brookfield DV3T Rheometer - Manual (Page 62)

Brookfield Engineering Labs., Inc. Page 62 Manual No. M13-2100
Communication is established when the Test Connection command button is pressed. You must
press this button every time the DV3T Rheometer is powered on. Be sure that the temperature
controller is turned on prior to pressing the Test Connection button.
The Default Temperature screen also allows the user to set a Default Temperature. The Default
Temperature is the set point value that will be used by the DV3T when a test (Viscosity Test or
Yield Test) is not in use. To set the Default Temperature first, enter a temperature value and second
check the Default Between Tests check box.
TIP: Use a Default Temperature when the test program includes a change in temperature and
set the value equal to the first temperature control point in the test. At the conclusion
of the test, the control device will be reset to the first temperature set point which will
minimize the time required between tests.
The Temperature screen also allows you to choose which temperature probe will be used for data
collection and temperature control. When the DV3T is controlling temperature through an external
device, there may be two temperature probes available for data collection: 1) the temperature probe
connected to the DV3T (Probe) and 2) the temperature probe associated with the temperature
control device (Controller). Press either Probe or Controller in the Temperature menu, figure the
first one above.
Printer Setup: The DV3T is configured for use with the Dymo 450 printer. No other printers can
be utilized with the rheometer. Printer Setup allows the user to choose from three
different configurations for print out.
Label Small: A small label (1.13inch x 3.5inch) that allows for printing of limited
data for a single data point. The label stock is available from
Brookfield; part number GV-1048.
Label Large: A large label (2.31inch x 4.0inch) that allows for printing of a
complete set of parameters for a single data point. The label stock
is available from Brookfield; part number GV-1049.
Receipt: A continuous roll of paper that allows for printing of multiple data
points. The paper stock is available from Brookfield; part number
GV-1047.
The Printer Setup is selected by touching the desired configuration, which will
result in a blue circle to appear to the left of the item. The OK command key must
be selected to confirm the setting.
AutoZero: AutoZero is an operation performed by the DV3T Rheometer automatically during
the power up sequence. This operation sets the instrument transducer to a correct zero
value. The zero value should not shift over time, however, if the user determines that
the zero is not correct, you can force an AutoZero to be performed without powering
down the rheometer. When the AutoZero function is selected, the DV3T is immediately
sets to AutoZero mode and the user is presented with the AutoZero screen (Figure II-2).
Upon completion, the user will be returned to the Device Setup menu.
Oscillation Check: The Oscillation Check is a check of the performance of the lower bearing of the
DV3T Rheometer. This lower bearing is either Point and Jewel or Ball Bearing.
Correct performance of the lower bearing is essential for proper operation of the
rheometer. A failed lower bearing will normally cause viscosity measurements
to be lower than expected.
An Oscillation Check is performed as follows:
• Remove the spindle and level the DV3T Rheometer
• Gently push up on the rheometer coupling.