User's Guide _______________________________________________________________________
68 ___________________________________________________________________ M211399EN-G
RH trimmer). Follow the instructions from the HM70 when
using this option.
-
2-point adjustment
: Adjusts the measurement of the HMW90
at two points to reference values that you specify. This option is
not available when adjusting temperature (T).
-
Revert factory calib.
: This option removes the currently
applied user adjustment from the HTM10 module. Only the
adjustment for the selected parameter is removed (RH or T).
8.
Complete the selected adjustment by following the instructions
from the HM70.
Adjustment Using a Computer
For more detailed instructions on using the Vaisala USB cable and a
terminal application, see section Connecting With a Computer on page
For a description of the serial commands, see section Calibration and
Adjustment Commands on page 57.
1.
Connect the HMW90 series transmitter to your computer using the
Vaisala USB cable (order code 219690).
2.
Start a terminal application and open a new session to the service
port of the transmitter. The serial line settings are 19200, N, 8, 1.
3.
Before changing the adjustment, issue the following commands to
see the transmitter’s current adjustment information:
pass 9000
crh
ct
ctext
cdate
4.
Place the entire transmitter in the desired reference condition and
allow the measurement to stabilize. Follow the stabilization from
the serial line (output from the
R
command) or the display.
5.
You can now use the
CRH
and
CT
commands to adjust the
transmitter’s RH and T measurement. Refer to the command
descriptions for the available options.
6.
After performing the adjustment, verify from the serial line or the
display that the measurement has been corrected.
7.
After completing the adjustments, you can enter a descriptive text
string in the transmitter’s memory using the
CTEXT
command,
and note the adjustment date using the
CDATE
command.
