Manual

M390S Manual Operation  17
4.6 PID Tuning Constants
The PID tuning constants have been factory set for optimum performance and are noted below.
Heating Heating 2 Heating 3 Heating 4
PB _____ PB2 _____ PB3 _____ PB4 _____
INTEGRAL _____min/repeat INT2 _____ INT3 _____ INT4 _____
DERIVATIVE___sec DERV2 _____ DERV3 _____ DERV4 _____
4.7 Controller Calibration
This blackbody has a precision temperature
sensor monitoring the emitter temperature. The
THERMOCOUPLE measurements are passed
through a look-up table that ultimately
provides the correct exit radiance temperature
for the indicated temperature. A separate
calibration report is included.
This controller has been programmed to contain
a custom look-up table that may be used to
precisely calibrate the controller/indicator
against reference sensor. The look-up table to
the right appears as shown in the controller GUI
interface (not supplied).
The logic of this table is: “when the sensor input
measures the value shown in INPUT #, force the
display to show the value in the corresponding
OUTPUT # and do linear interpolation between
points”. A sample table is shown to the right.
The actual table used for your calibration is
shown on the next page.
Follow directions on the next page to alter
output values from the controller front panel.
Note: You may download Eurotherm iTools Software from this web site:
http://www.eurotherm.com/products/controllers/itools/
With this software and some practice, you will see this GUI interface screen. To permit
iTools to talk to your blackbody, you may have to set the controller comm. port to
“Modbus” mode. Procedure to change communications to Modbus are shown in
Section 4.8.