Brookfield DV-III Rheometer - Manual (Page 22)

Brookfield Engineering Laboratories, Inc. Page 22 Manual No. M/98-211-A0701
IV.2 DV-III Speed/Time Pair Programming
This programming method allows the operator to control the DV-III+ through the variables of speed
and time. These speed/time pairs instruct the rheometer to operate at a speed of rotation for a certain
period of time. Programs can be created with up to 25 steps. The DV-III+ can store up to 10
programs. Upon completion of a program, the data may be viewed on the DV-III+ display, analyzed
or printed to an attached parallel or serial printer.
Two examples of programs are shown below:
Collect Data Over Time Collect Data At Several Speeds
Step RPM Time Step RPM Time
1 100 00:12 1 2.5 01:00
2 100 00:12 2 5 00:30
3 100 00:12 3 10 00:30
4 100 00:12 4 20 00:15
5 100 00:12 5 50 00:15
Five viscosity data points Five viscosity data points will be
will be collected over collected at five speeds over
one minute. 150 seconds.
This program mode is accessed by pressing the program key and selecting number 1; 1 = DV-III.
The creation, editing and execution of DV-III programs are described in the following sections.
There are two types of test programs:
1) Next Speed Set where the test speeds are programmed, and the operator must signal the DV-
III+ to change speeds (and therefore take a reading) by pressing the ENTER key.
2) Prog Speed Set where the DV-III+ will perform the test automatically.
Each step of a program has two variables - speed and hold time. The reading is taken at the end of
the hold time interval in a Prog Speed Set or when the
ENTER key is pressed in a Next Speed Set.
If the first step hold time interval is 0 seconds, the program is a Next Speed Set type. If the first step
interval is 1 second or more, the program is a Prog Speed Set type.
SPEED SET SELECTION AND PROGRAMMING
The DV-III+ viscometer allows for the retention of a maximum of 10 speed sets with up to 25
discrete speeds per speed set. The program locations are numbered 0 through 9. These speed sets
are retained in EEPROM memory for those times when the DV-III+ is not powered up. To access
a previously programmed speed set or to enter data for a new speed set, the user presses the “1” key
when in the display of Figure 20 and is presented with the screen shown in Figure 21: