Brookfield DV-II+ Programmable Viscometer - Manual (Page 12)

Brookfield Engineering Labs., Inc. Page 12 Manual No. M/97-164-F1102
II.3 SET
SPEED
Speed Selection, Setting, Running
There are 54 speeds programmed into the DV-II + . These speeds correspond to the standard LVT,
RVT, HAT and HBT dial models (18 possible speeds altogether) plus 36 additional speeds.
The DV-II+ comes with the Sequential Speed Set already selected (see Appendix F). The speed set
will start at speed 0.0. It will then scroll up through the LV speeds, pass through speed 0.0 again, and
then scroll up through the RV speeds, pass through speed 0.0 again and then repeat the above
sequence.
The DV-II + can also be configured by the operator to interleave the LV and RV speeds. See Section
III.2.3 on Setup for a description of how to install the Interleave Speed Set.
A complete list of speed sets and custom speeds is included in Appendix F. The DV-II+ can be
programmed to select up to 19 of the 54 speeds for use at any one time. Speed 0.0 is the 20th speed
and is automatically included. See Section III. 2.3.2 on Setup for a description of how to install a
Custom Speed Set.
To select a Viscometer speed first press either the UP or DOWN arrow keys which will cause the area
to the right of RPM to display the currently selected speed. Figure 8 shows the DV-II + is operating
at 6.0 RPM, and the current selected speed is 6.0 RPM.
cP 123.4 20.1C
6.0RPM6.0 % 15.6
Figure 8
If the ARROW key is pressed just once and then released, the characters “RPM” will blink for three
seconds, then will cease blinking resulting in no change to the speed entry.
Note: The speed selection process remembers the last value of scrolled-to speed so
that the next time you initiate a speed change (by pressing an ARROW key), the
DV-II+ will begin its scroll display from the last entered value.
The last-scrolled-to speed does not necessarily have to be the same as the speed at which the DV-
II
+ is currently running. The user may operate at a given speed and pre-set the DV-II + to the next
desired speed before that speed will be used. For example, if the DV-II + is currently running at 6.0
RPM and was previously scrolled to 12 RPM, a single press of either ARROW key would result in
the Figure 9 screen display:
cP 123.4 20.1C
6.0RPM12 % 15.6
Figure 9
Pressing the SET SPEED key would cause the DV-II + to begin running at 12 RPM.
If the user did not press the SET SPEED key, the DV-II + would continue to run at its current speed
of 6 RPM. In fact, you may scroll to a new speed (12 RPM in this example) and press the SET SPEED
key at any future time (without further pressing an ARROW key) to immediately cause the DV-II +
to run at the new speed. Pressing the ARROW key at any time reminds the operator of what was
selected for the next speed.