Cannon Instrument miniQV-X - Manual (Page 65)

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CANNON ® miniQV-X Automatic Viscometer with VISCPRO ® Instruction & Operation Manual
Version 1.0— October, 2008; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
Date selection: The calibration program uses data from previously-run
standards to determine the calibration constants. To select the desired
standard data, use the No older than [x] days spin controls to set the
date parameters for the database search (if “1” is selected, only the
standards run in the past 24 hours will be used).
Bulb selection: Viscometer bulbs are numbered from the bottom to the
top of the viscometer tube. Use the spin controls to select the correct bulb
for calibration.
Data selection: Test data from standards run with the miniQV-X within
the specified Date parameter will be automatically displayed in the list
box.
To select and deselect the data from the sample runs to be used for the
calibration, press and hold the C key and click on the samples to
highlight those you wish to include in calibration calculations.
NOTE Sample run data from at least two different standards for each bulb at
each calibration temperature must be available for calibration calcula-
tions to be performed.
After you have selected the desired data, release the C key and click
Calculate new constants to update values for C and E.
You may evaluate the accuracy of the new calibration constants by
comparing the known viscosity for the standard with the calculated
viscosity for each standard selected for the new calibration. This differ-
ence is displayed as a percentage in the last column (% Diff) of the
updated sample list box.
Show Calibration Data The Show Calibration Data button is a toggle that will permit you to
compare current and new calibration data and constant information. Press
the Show Calibration Data button once to view the current calibration
information. Note that the button name will change to Display Sample
Data. Press the button again to display the new calibration data.
When/if you are satisfied with calculation results, click on Update Tube
to save calibration values for the current configuration. The new data will
become the current data.
If the difference is still too great, repeat the calibration process until the
difference falls within acceptable limits (refer to the precision statement
in ASTM D445).