-16-
4)
Calibration:
The Calibration Tab is used to input the calibration factor or to calculate a
new value. Great care is taken in generating the initial calibration of the Exactus
instrument. We recommend discussing recalibration with the factory before proceeding.
Place the lightpipe or lens so that it is looking at a very stable and well-known
temperature target, preferably a blackbody. Then type the known temperature into the
Desired Temperature box and click the Auto-Cal button followed by the OK button. (See
Figure 10).
Figure 10: Auto-Calibrate menu.
5)
Modbus:
Use the modbus menu to assign a polling address. Please see Appendix X for
information on communicating with the Exactus probe via Modbus.
6)
Advanced:
The Advanced tab has several unique features which are available
exclusively in the Exactus instrument; please see Section 4.5.3 for details about this
important configuration tab.
4.5.3 Advanced Features:
The advanced features in the Exactus instrument are designed to allow the user to correct and
manage a variety of pyrometric measurement issues, including adjustment of emissivity or slope
correction, signal averaging (
Averaging Buffer
) and heat transfer (
Transfer Function
). These
features can also be entered in table form, with corresponding temperatures for each table entry,
so the parameter will automatically adjust the target temperature changes. These features are set
up for each instrument using the Advanced tab in the
Probe Parameters
menu
.
Emissivity:
This feature allows the user to type in a single emissivity value that will cover the
entire measurement range, or enter a table of emissivity values and corresponding temperatures.
Based on the entered table, the instrument will automatically adjust the emissivity as the
temperature changes.
The table may include one row or as many as eight (8) rows to map emissivity verses
temperature. The table can be edited, or rows can be added or deleted using the buttons below
the table. Smaller values of emissivity will increase the temperature readings. An emissivity of
1.0 is used when the box above the table is not checked. By checking the
Hold
or
Extrapolate
buttons below the table, the user can select whether the emissivity will be held at the last entries
or linearly extrapolated beyond the last entries; the user should verify the extrapolation makes
physical sense (emissivity never greater than 1.0 or less than 0.0 within the temperature range of
the instrument.
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