Brookfield R/S CPS Rheometer Manual de usuario descargar pdf (Pagina 33)

BrookeldEngineeringLabs.,Inc. Page33 ManualNo.M08-218-B0212

VI.6.2 Utilities → EditProgram

This function allows the input of new programs and the modication of existing programs.

The programs may be run after a successful creation via the menu level “Program Measure-

ment” in the main menu.

The following values are user-denable in a program:

• measuring system to be used

• number of steps

• start and end value of each step

• number of measuring points in the program

• duration of measurement

Preset value as a function of time:

D[1/s]=f(t)

100

0 60 120 180

t[s]

D[1/s]

A standard measurement is shown in the following example:

• 1st step: shear rate increases within 60 sec from 10.00 to 100.00 s

-1

• 2nd step: shear rate remains at 100. 00 s

-1

for 60 seconds

• 3rd step: shear rate decreases from 100.00 back to 10.00 s

-1

within 60 seconds

This measurement consists of three steps, each lasting 60 seconds and containing a number

of measuring points.

The following is an example to explain the input of a program.

Apart from the shear rate D [s

-1

] = f(t), the preset value can also be dened as:

• speed n [rpm] = f(t)

• torque M [‰] = f(t) and

• shear stress Tau [Pa] = f(t)

Steps are always linear, measurement points are also dened as linear; i.e. logarithmic steps

are not possible. For logarithmic measurements, you will need the Rheo 3000 software.

Preset value sub-steps in a dened step are done according to the following equation:

Preset Value = End Value - Start Value/(Number of Measuring points - 1)

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 61 62

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Brookfield R/S CPS Rheometer Manual de usuario Pagina 33