Cannon Instrument miniAV-X - Manual (Page 64)

CANNON ® miniAV-X Automatic Viscometer with VISCPRO ® Instruction & Operation Manual
Version 1.Ob— March, 2012; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
58
Select which bulb to apply the Vent bulb drain time parameter.
Bulb overdraw Use the Bulb Overdraw button/window to set the the amount of time in
seconds that the instrument will draw sample AFTER the sample menis-
cus has covered the target sensor in the viscometer tube. More viscous
materials may require a larger overdraw time to ensure that the sample
meniscus does not dip below the target sensor during temperature equili-
bration.
Proper adjustment of the overdraw can maximize efficiency of the test
cycle. Too much overdraw can contaminate vacuum lines and interfere
with pump operation. Too little overdraw can interfere with the initiation
of sample testing following the temperature equilibration period. Note
that lighter oils will be pulled higher in the bulb.
Saving a configuration
Whenever you have altered instrument, tray or sample configuration, you
should save the resulting settings as a new or existing configuration. To
save current settings, use the
Save Instrument option:
Procedure 1. From the VISCPRO ® primary menu options, click Configure .
2. Select the desired instrument and click Save Instrument & Tray
Settings . The Save Configuration window will appear.
3. Type a name for the new configuration in the Save As: box. Or click
an existing configuration from the configuration list box.
4. Click OK to save the configuration. Or click Cancel to exit the
Save Instrument & Tray Settings window without saving your
changes.
Calibration
The Calibration window provides controls for calibrating each bulb
associated with your instrument. You may need to log onto the system as
a Manager to access these security-protected calibration functions.
Use the bulb spin controls to display current constants and valid
check standard data available for calibration of each bulb.
Calibration constants are determined individually for each bulb. Data for
automatic calculation of tube calibration constants is derived from check
standards run using that tube.
For information regarding the miniAV-X calibration procedure, see
Chapter 3, Calibrating the miniAV-X.
The Calibration window options are described briefly below: