Vaisala HMP228 User Manual
Page 34
HMP228
Operating Manual
M210282en-A
28
T : 0.90 Ref1 ? c
T : 0.55 Ref1 ? c
T : 0.55 Ref1 ? 0.0
Press any key when ready...
•
After giving the correct temperature value (Ref1) and pressing
press any key and then
4.6.1.2
Using display/keypad commands
•
Leave the reference instrument and the transmitter for at least 4 hours
in the same space so that their temperatures have time to equalize.
Remove the filter cap prior to calibration.
•
Check the transmitter against the reference.
•
Select Cali in the main menu and then T cal; select one-point
calibration T 1 point cal.
•
Change the reading with the arrow keys to correspond to the reference
and press ENT.
4.6.1.3
Using LED commands
•
Leave the reference instrument and the transmitter for at least 4 hours
in the same space so that their temperatures have time to equalize.
Remove the filter cap prior to calibration.
•
Check the transmitter against the reference.
•
Connect an ammeter/voltmeter to the analogue outputs (connector
X2). Give command ¡¡l¡. At the first calibration point the LED
on the left flashes; adjust the first point (offset) with the arrow
switches to the same reading with the reference and press ENT
switch.
•
After adjusting the offset point and pressing ENT the second LED
from left flashes. Press ENT without changing the output value.
4.6.2
Two point temperature calibration
Disconnect the security lock jumper!
4.6.2.1
Using serial commands
•
Leave the reference instrument and the transmitter for at least 4 hours
in the same space so that their temperatures have time to equalize.
Remove the filter cap prior to calibration.
•
Check the transmitter against the reference.
•
Give command CT
>CT
T : 0.90 Ref1 ? yy.y
Press any key when ready