CHAPTER 5________________________________________________________________ COMMANDS
VAISALA _________________________________________________________________________ 47
The interval parameter defines the frequency of auto-calibration
cycles. When the transmitter is turned on, the first auto-calibration
takes place after on hour unless the frequency has been set to less than
an hour. After the first auto-calibration, the set frequency is activated
and the auto-calibration takes place e.g. every six hours. If the setting
is changed, it becomes valid only after the next auto-calibration has
been completed. If you wish to activate it immediately reset the
transmitter or turn it off.
The Max dTdp parameter defines the maximum allowed change of the
dewpoint value during the pre-defined dTdp time. If the change in
dewpoint value exceeds the limit, the calibration is not started. The
auto-calibration is done only after process is stabilized. The
transmitter retries untill the calibration is succesfully complited. Note
that normally, this parameter does not have to be changed.
The dTdp time defines the measuring time of the change in dewpoint
prior to the auto-calibration (see the parameter Max dTdp).
The Max corr. parameter defines the maximum correction (%RH) the
transmitter does during each auto-calibration cycle.
The Settl time defines the time the output values prior to the auto-
calibration are frozen after the calibration. The time is for sensor
temperature stabilization.
NOTE
Normally, the Max dTdp and the Max corr. parameters need not be
changed.
NOTE
Auto-calibration takes place only when the security lock jumper is
connected. With command <fst on>, the serial line printing indicates
the stages of the auto-calibration (n = no auto-calibration, w,h,s =
different phases in auto-calibration, S = settling time auto-calibration
is on).
DCAL<cr>
>dcal
Calibration...
any key to abort
> (appears when the auto-calibration
is completed in 60 - 70 seconds)
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