USER'S GUIDE____________________________________________________________________
56 __________________________________________________________________ M211024EN-B
Temperature Calibration (CT)
The procedure below describes a temperature (T) measurement
calibration using serial line commands. You can use the procedure to do
a one-point calibration (offset) or a two-point calibration (offset and
gain). For two-point calibration, the second reference point must be at
least 20
º
C warmer than the first.
Temperature measurement is not controlled by the trimmers, so do not
adjust them during temperature calibration.
1.
Connect the USB cable to the service port on the module, and to a
USB port on your PC.
2.
Start a terminal application and set the correct connection settings.
The default serial settings are
19200 8 N 1
. Remember to check
which COM port the USB cable is using.
3.
Verify that the connection works by giving the
?
command:
>?
If the module does not respond with device information:
- Check that the module is powered
- Try
the
??
command in case the module is in POLL state, open
the line using
OPEN
command if necessary
- Check your serial line settings and cable connections
- Power off the module, unplug the USB cable, restart the
terminal application, and try again.
4.
When your serial connection is working, use the
L
command to see
the current user adjustment parameters and the status of the
trimmers. Write down the T offset and gain values so you can
restore them manually using the
LI
command, if necessary.
>l
5. Use
the
ERRS
command to see that no errors are active:
>errs
6. Use
the
PASS
command to enable the advanced commands:
>pass 1300
7.
Insert the probe in the temperature reference and wait for 20 – 40
minutes for the reading to stabilize.
