Brookfield DV-III Ultra Rheometer User Manual
Page 32
Brookfield Engineering Laboratories, Inc.
Page 32
Manual No. M/98-211-B0104
Brookfield Engineering Laboratories, Inc.
Page 32
Manual No. M98-211-E0912
IV.2 DV-III Speed/Time Pair Programs for Making Viscosity Measurements
This programming method allows the operator to control the DV-III Ultra 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 Ultra can store
up to 10 programs. Upon completion of a program, the data may be viewed on the DV-III Ultra
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 Ultra to change speeds (and therefore take a reading) by pressing the
ENTER
key.
2) Prog Speed Set where the DV-III Ultra 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.
S
SPEED SET SELECTION AND PROGRAMMING
The
DV-III Ultra 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 Ultra 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 IV-1 and is presented with the screen shown in Figure
IV-2:
SPEED SET OPERATIONS
1 = ENTER/EDIT A PGM
2 = CLEAR SPEED SET
3 = USE SPEED SET
Figure IV-2