Vaisala PTB220 - Manual (Page 68)

U SER ' S G UIDE _______________________________________________________________________
62 ___________________________________________________________________ M210194 EN -A
NOTE Always remember to return the switch SW4 to write DISABLE
position (OFF).
Multipoint adjustment
MPCI Entering multipoint corrections
MPCI n
where:
n = number of the pressure transducer (1, 2 or 3)
The MPCI command is used to enter new multipoint corrections to the
barometer. Note that the user must give the multipoint corrections to
each pressure transducer separately.
Entering new multipoint corrections is protected by switch SW4. The
switch SW4 is normally in write DISABLE position (OFF) and the
user must change it to write ENABLE position (ON) to be able to
enter new linear and multipoint corrections to the barometer.
The previous corrections must first be deactivated using the LC OFF
and/or MPC OFF commands. Precalibration of the barometer then
gives the required corrections. The new multipoint corrections will
always cancel the previous corrections as well as the valid date of
calibration of the barometer (see CALD command). When entering
new multipoint corrections, always start at the low end and then go up
the pressure range. Use ESC to abort without executing the command.
When the new multipoint corrections have been entered, they must be
activated with the MPC ON command.
In the following, an example of performing a multipoint adjustment
for pressure transducer P1 is given.
>lc off
Linear adj.
: OFF
>mpc off
Multipoint adj:
OFF
>mpci 1
P1 1. reading ? 499.72
correction ? -0.07
P1 2. reading ? 599.20