Saving a calibration – Cannon Instrument miniPV-X User Manual

Page 40

CANNON

miniPV

-HX Automatic Viscometer with VISCPRO

Instruction & Operation Manual

Version 1.0— January , 2011;

CANNON

Instrument Company

2139 High Tech Road • State College, PA 16803 • USA

Selecting samples

10. Select (or deselect) the specific sample entries you desire to use for

calibration from the displayed list by clicking on them. To select a
range of samples, highlight the first sample and click on the last
sample while simultaneously pressing the

S key. To select

several individual samples for calculation, hold down the

C key and

click on each of the desired samples.

NOTE

You must select at least two entries or the software will not recalculate the
constants.

11. When the desired samples have been selected, click on

Calculate

New Constants

. The new constant(s) for that bulb,

and

, will be

displayed in their respective fields at the bottom of the window.

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
difference is displayed as a percentage in the last column (

% Diff

) of

the updated sample list box.

Comparing current/new dataThe

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

parameters.

When/if you are satisfied with calculation results, click on

Update Tube

to save calibration values for the current configuration.

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 D 446). If the tube calibration fails repeatedly, refer to Chapter
5 for miniPV Series maintenance/service information.

12. When the new calibration constants are acceptable, click on

Update

tube

to save the constants for the current instrument.

NOTE

You must click Update tube before changing bulbs if you wish to save the
new calibration constants for that bulb.

13. Repeat steps 8-12 for all the timing bulbs. When the proper constants

for all the timing bulbs have been determined, close the

Calibration

window.

14. Test several standards to verify a successful calibration.

Saving a calibration

When calibration is complete, the calibration information is saved to the
current instrument configuration and will be displayed in the

Tray Set-

tings: Tube and Bath window

. This calibration information will remain