Brookfield DV-III Ultra Rheometer - Manual (Page 31)

Brookfield Engineering Laboratories, Inc. Page 31 Manual No. M98-211-E0912
IV. PROGRAMMING THE DV-III ULTRA AND DATA COLLECTION
METHODS/ANALYSIS
The programming and data analysis functions of the DV-III Ultra are accessed by pressing the
PROG key on the rheometer. The display will change to present a menu with four choices: DV-
III, B.E.V.I.S., Models and Yield as shown in Figure IV-1. DV-III, B.E.V.I.S. and Yield are the
programming alternatives. Models will present the five math models available for viscosity data
analysis (see IV.7 for more details about Math Models).
PROGRAM MODES
1 = DVIII
3 = MODELS
2 = BEVIS 4 = YIELD
SELECT:_
Figure IV-1
IV.1 Programming Concepts
The DV-III Ultra may be programmed to collect viscosity or yield data without operator involvement.
The captured data may be displayed and analyzed or output to a printer. Programs may be written
using three different methodologies: DV-III, B.E.V.I.S and Yield.
The DV-III Ultra programming technique uses speed/time pairs, when making viscosity measurements,
to control the DV-III Ultra. A program consists of multiple lines (up to 25) instructing the rheometer
to operate at a particular speed for some period of time. As an example, we can instruct the DV-III
Ultra to rotate the spindle at 5 RPM for 30 seconds and then change speed to 10 RPM and wait 20
seconds with the following program:
Step 1 RPM = 5 Time = 00:30
Step 2 RPM = 10 Time = 00:20
A single data point will be collected at the end of each time interval. Complete details on this
programming technique are in Section IV.2.
The B.E.V.I.S. programming technique uses a custom program language to control the DV-III Ultra.
A program consists of a series of commands instructing the rheometer in speed control, time control,
data collection, temperature control, and output. B.E.V.I.S. offers a higher level of rheometer control
compared to the DV-III method. However, the construction of B.E.V.I.S programs is more involved.
The 2-step DV-III program previously described is duplicated using B.E.V.I.S. commands below:
SSN 5
WTI 00:30
PDN
SSN 10
WTI 00:20
PDN
END
The involved programming of B.E.V.I.S. commands is a small trade-off for the significant increase
in control capability over the DV-III method. Complete details on this programming technique are
in Section IV.3.
The yield programming technique uses three control parameters to run yield tests on the DV-III
Ultra: speed control, time control and torque change between successive data points. Complete
details on this programming technique are in Section IV.