ACR Systems OWL 100 Manual page 33

Please note that the range must be selected and saved before calibration. Calibration values only apply
to that specific range.
You can calibrate OWLs by comparing them against values that you know to be accurate. When you
have done this, you can enter the logger values and the actual values in the Calibrate dialog box.
For the two data points, choose two values that are as far apart as possible.
For example:
1. If you discover that at 100 the logger registers 100.3, type 100.3 as the First Data Point in the
Logger Value box, and type 100 in the Actual Value box.
2. Then, if you discover that at 0 the logger registers 0.4, type 0.4 as the Second Data Point in the
Logger Value box, and type 0 in the Actual Value box.
3. Click Generate. Values will appear in the Zero and Span boxes.
4. Click Accept.
This information still has to be sent to the logger.
5. Click Send Setup in the Setup window.
It is vital to follow the correct procedure when recalibrating an OWL. An OWL that has been calibrated
will have values other than zero in the Zero and Span boxes. When you see values other than zero in
the Zero and Span boxes, you must again test the logger's readings against readings that you know to
be accurate before you enter any values in the Calibrate dialog box.
NOTE: Make sure range is set before you calibrate. Calibration only applies to that range.
To set the size of the range (not applied to OWL-500), click the left or right arrow (in OWL setup) until
you find a range size that suits your purpose.
© 2001 ... ACR Systems Inc.
OWL 200 and Custom Equations
Figure 6-5
33