Vaisala MMT310 - Manual (Page 58)

User's Guide _______________________________________________________________________
58 ___________________________________________________________________ M210474EN-C
High End Adjustment
6. After you have performed the low end adjustment, insert the probe
head into a measurement hole of the high end reference chamber
(e.g. NaCl: 75 % RH chamber in the humidity calibrator HMK15,
use the adapter fitting (13.5 mm)). Note that the difference between
the two humidity references must be at least 50% RH.
7. Let the probe stabilize at least 30 minutes. You can follow the
stabilization by pressing any key, typing C and pressing ENTER.
8. When stabilized, type the high end reference value after the
question mark and press ENTER.
crh
RH : 11.25 Ref1 ? c
RH : 11.24 Ref1 ? c
RH : 11.24 Ref1 ? 11.3
Press any key when ready ...
RH : 75.45 Ref2 ? c
RH : 75.57 Ref2 ? c
RH : 75.55 Ref2 ? c
RH : 75.59 Ref2 ? 75.5
OK
>
OK
indicates that the calibration has succeeded
9. Take the probe out of the reference conditions and replace the
filter. Take care to tighten the filter properly, recommended force
130 Ncm.
10. If needed, give the calibration information (date and text) to the
transmitter's memory, see the serial commands on page 61.
11. Reset the transmitter by giving the RESET command. The
transmitter returns to normal mode.