Cannon Instrument miniAV-X - Manual (Page 57)

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CANNON ® miniAV-X Automatic Viscometer with VISCPRO ® Instruction & Operation Manual
Version 1.0b— March, 2012; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
Soak time
Input the desired sample soak times for each bulb of the viscometer tube.
The soak time is the length of time in which the sample will remain in the
viscometer tube before being dropped. The soak time is important to
ensure temperature equilibration of the sample. The range is from 0 to
240 based on which units of time the user selected from Soak Time Units.
Constants The Tray Settings: Tube and Bath screen displays the calibration
constants ( C and E ) for each bulb of the viscometer tube. These values
cannot be edited from the Tray Settings . . . screen. For information on
determining bulb constants for viscometer tubes, see Calibration later in
this chapter.
NOTE When you have completed the configuration and saved the current tray
settings, you may wish to permanently store the current instrument
settings using the Save Instrument and Tray Settings item in the Config-
ure menu for a given instrument.
Tray Settings: Test
The Tray Settings: Test window is used to select parameters for
miniAV-X sample testing. Each sample drop is called a determination.
Multiple determinations are possible during testing of a single sample.
Comparisons of sample drop results permit user regulation of test preci-
sion.
The Maximum Absolute Difference option permits you to input the
maximum acceptable deviation for multi-drop samples, expressed as the
difference in the sample drop times in seconds.
The Maximum % Difference option allows you to input the maximum
acceptable deviation for multi-drop samples expressed as a percentage
(0.35 is the default percentage difference allowable). Values from 0.01 to
99.99 are acceptable. If the difference between test drop times is greater
than the acceptable deviation, the sample will be tested again until the
deviation in drop times is less than the
Maximum % Difference, or until
the maximum number of determinations has been reached.
The Maximum Determinations option permits you to select from 1-20
iterations of the test using the same sample.
Tolerance parameters Determine if the tolerance for differences between sample run times
(determinability) is going to be decided by the absolute difference in drop
time values (in seconds) or by the percentage difference between the drop
times. Click on the appropriate check box to select your choice(s).