One point calibration procedure, 1 using serial commands, 2 using display/keypad commands – Vaisala HMP260 User Manual

Page 45

HMP260 SERIES

HMP260-U017en-1.5

Operating Manual

1997-11-25

NOTE

If the sensor has been changed, the calibration has to be
done according to the instructions in Chapter 6.1.3.

6.1.1.

One point calibration procedure

6.1.1.1

Using serial commands

Disconnect the security lock jumper!

•

Make sure that the sensors of the transmitter and the reference in-
strument are close to each other. Allow enough time for the sensor
heads to stabilize to the measurement conditions

•

Give command CRH and enter the humidity value and press
.

>CRH
RH :

xx.x

Ref1 ?

yy.y

Press any key when ready...

•

If you want to see how the sensor stabilizes to the reference humidity
enter c instead of the first reference:

RH : 11.9

Ref1

? c

RH : 11.5

Ref1

? c

RH : 11.5

Ref1

? 11.3

Press any key when ready...

•

Press any key and press when the transmitter requests the second
point value.

yy.y

Ref2 ?

6.1.1.2

Using display/keypad commands

Disconnect the security lock jumper!

•

Make sure that the sensors of the transmitter and the reference in-
strument are close to each other. Allow enough time for the sensor
heads to stabilize to the measurement conditions

•

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.