Vaisala HMT310 - Manual (Page 73)

Chapter 6 ___________________________________________________ Calibration and Adjustment
VAISALA ________________________________________________________________________ 73
Multipoint Relative Humidity Adjustment
Syntax: MPC [quantity] [function]
where
quantity = Quantity to be adjusted. The only available quantity is
RH.
function = Desired function. The options are:
ON – Enable multipoint correction.
OFF – Disable multipoint correction.
LIST – Show correction table.
INIT – Start entering values in correction table.
CLEAR – Remove all values from correction table and
disable multipoint correction.
Multipoint calibration (applicable from software version 2.0.1 onward)
can be used to optimize RH measurement in a narrow range of
measurement by using 3-8 adjustment points. For more information and
an example multipoint calibration, see section Multipoint Adjustment
Using Serial Line on page 78.
Relative Humidity Calibration and Adjustment
(in Two Points)
Use two reference humidities over the measurement range. The
references need to have a difference of at least 50 %RH.
Before calibration HMT310 needs to be set to adjustment mode by
pressing the adjustment button once, see Figure 18 on page 74. To return
to normal operation mode, use the RESET command: see Reset
Transmitter on page 53.