Vaisala PTB200 - Manual (Page 23)

PTB 200 22 (28)
Digital Barometers
SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1
4 ADJUSTMENT AND CALIBRATION
The PTB 200 barometers can be adjusted and calibrated against local
primary standards that have high accuracy and stability as well as
known traceability to international standards.
The PTB 200 barometers are recommended to be adjusted or
calibrated once a year when used in automatic weather station applica-
tions. In very demanding pressure standard applications shorter adjust-
ment or calibration periods, e.g. two to four times a year, can be
chosen.
The user can not erase the basic pressure and temperature adjustment
coefficients made at factory from the barometer’s memory. If anything
goes wrong with adjustments or calibration, the user can always revert
to the basic factory settings by changing the MEMORY jumper to
EEPROM write enable position and then giving the following
commands:
>LIP<cr>
P offset 0 * 0.001 ? 0<cr>
P gain 0 * 0.00001 ? 0<cr>
>MPC OFF<cr>
Multip. corr. : OFF
The factory settings can be changed only when the MEMORY jumper is
in the EEPROM write enable position (see Fig. 7).
MEMORY JUMPER
write disable
write enable
Fig. 7 MEMORY jumper positions