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Pressurements PressCal
Users Manual
6-4
Obtaining Certificate Calibration Data
Click on Calibrate to open the “Certificate Data” window. The window shows a series
of columns categorized as “Instrument Reading”, “Applied Pressure”, “Instrument
Error”, “Error (%FS)” and “Outside Accuracy Statement”.
Manual Certificate
If you are generating a manual certificate you can enter the values directly into the
columns. These values may have been provided by PressCal during an earlier calculation.
When entering the values ensure that the units are correct and that the values entered
match the original calculations.
Use the mouse to select the rows that you are going to enter the data into, or alternatively,
use the Next and Previous buttons to scroll through the editable rows.
Click on Main Cert. Panel to return to the “Certificate of Calibration” window.
Automatic Certificate
If you are generating an automatic certificate the results are inserted directly from the
main computation window.
Each of the cells within the “Instrumental Reading” column has a default value set, which
evenly divides the selected range by the number of points, for example a range between
0 and 40 bar with 4 Pressure points would have values of 0, 13.33, 26.67 and 40.00
within the columns.
You can either compute the results for the given values or you can modify the values to
increments of your choice.
There are two methods of changing the values, you can either change the values directly
within the column, then compute, or you can change the values using the Target
Pressure field within the main PressCal window.
To compute the results you have to calculate the values one row at a time. Use the
Previous and Next buttons to select the first row, then click on Compute. The window
closes and the main PressCal window is displayed.
The calculation is performed automatically, taking into account all previous settings
(see Setting up PressCal). If you wish to replace the Target Pressure with one of
your own, do so now and press <Return> to recalculate.
Note
Changing the Target Pressure may cause the selected weights to change.
Click on Put into Certificate to accept the results and to go back to the
“Certificate Data” Window.
The next calibration point is selected from the list. Alternatively, use the Previous or
Next buttons to highlight a particular point. Click on Compute and go through the
computation process again until all rows have been processed.
Click on Main Cert. Panel to return to the “Certificate of Calibration” window.
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