Vaisala DMP248, Operating Manual

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PPENDIX
1
SERIAL COMMANDS
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AISALA
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Auto-calibration commands
DRYCAL Defining the frequency of auto-calibration cycles
DRYCAL<cr>
>drycal
DCAL ON
Interval min : 60 ?
Max dTdp: 2.00 ?
dTdp time s : 10
Max corr. : 0.040 ?
Settl time s : 50
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 before auto-
calibration. 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
dTdp
defines the time for
Max dTdp
measurement.
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 (measured before auto-calibration)
are frozen after the auto-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.
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