Vaisala HMP240 User Manual
Page 46
HMP240
User's Guide
M210300en
44
6.1.1.1
With serial commands
•
Make sure that the sensors of the transmitter and the
reference instrument are close to each other. Allow enough
time for the sensor heads to stabilize to the measurement
conditions
Disconnect the security lock jumper!
•
Give command CRH <cr>, enter the humidity value and
press <cr>.
>CRH <cr>
RH : xx.x Ref1 ? yy.y <cr>
Press any key when ready...
•
If you want to see how the sensor stabilizes to the refer-
ence humidity, enter c <cr> instead of the first reference:
RH : 11.9 Ref1 ? c <cr>
RH : 11.5 Ref1 ? c <cr>
RH : 11.5 Ref1 ? 11.3 <cr>
Press any key when ready...
•
Press any key and <cr> when the transmitter requests the
second point value.
RH : yy.y Ref2 ? <cr>
6.1.1.2
With display / keypad commands
•
Make sure that the sensors of the transmitter and the
reference instrument are close to each other. Allow enough
time for the sensor heads to stabilize to the measurement
conditions
Disconnect the security lock jumper!
•
Select Cali in the main menu and then RH cal; select Not
changed and then one-point offset correction RH 1 point
cal. Change the humidity reading with the arrow keys to
correspond to the reference value and acknowledge it with
ENT; pressing an arrow once changes the reading by 0.05
%RH.