Brookfield DV1 Viscometer - Manual (Page 19)

Brookfield Engineering Laboratories, Inc. Page 19 Manual No. M14-023
TIP: Speeds are grouped according to traditional LV and RV settings.
TIP: When setting a test procedure, be aware if the data must be compared to another site.
If a comparison is required, it is best to utilize speeds that are traditionally associated
with the torque range of the viscometer. This will ensure that all test sites will be able to
reproduce the test method exactly.
The Set Speed screen also includes the currently selected spindle and the Full Scale Range of viscosity
(FSR). The FSR represents the maximum viscosity value that can be measured with the currently
selected spindle and speed combination. As the speed is changed, the FSR value will change to reflect
the new condition. Each spindle and speed combination has a unique FSR.
TIP: The minimum viscosity measurement range is 10% of the FSR.
TIP: Full Scale Range is the same value as AutoRange.
TIP: The accuracy of viscometer measurement is expressed as a percentage of the Full Scale
Range.
The Set Speed screen include three Hot Keys:
BACK: Return to the Home screen without changing the speed selection.
SELECT: Accept the speed selection and return to the Home screen.
SPEED: Accept the speed selection and move to the Set Spindle screen.
II.7 Full Scale Range
The Full Scale Range (FSR) is a calculation of the maximum viscosity value that can be measured by
a spindle and speed combination when used with the specific spring torque of the DV1 Viscometer.
This value represents the measured viscosity which will be displayed when the instrument’s %torque
reading is at 100. The FSR will be displayed during the spindle selection process and the speed
selection process. The FSR value will change as the selected speed or spindle is changed and will be
displayed in the viscosity measurement units selected by the user in the Options Menu (see Section
II.8 ).
Brookfield recommends that viscosity measurements be made only when the instrument’s %torque
value is between 10 and 100. The FSR represents the maximum value that can be measured (100%
on the Torque scale). The minimum viscosity that can be measured is 10% of the FSR (equivalent
to 10 on the Torque scale).
The accuracy of the Brookfield viscometer is expressed as a percentage of the instrument’s Full Scale
Range. When using the standard LV (61-64) and RV (2-7) spindles, the instrument’s accuracy is
+/-1% of the Full Scale Range (see Section I.4).