Vaisala PTB330 - Manual (Page 83)

Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 81
ICAOQNH
The ICAOQNH command selects the calculation formula and
rounding method used for QNH and QFE calculations.
For calculation formulas, see Appendix A, Calculation Formulas, on
page 133.
ICAOQNH [?] [ON/OFF]
where:
? = Displays the current ICAOQNH status.
ON = ICAO QNH calculation formula, QNH and QFE values
rounded down to nearest integer. Only units [hPa] and [mmHg]
are available for QNH and QFE.
OFF = Default QNH calculation formula, no rounding other than
specified with FORM command on page 70. All pressure units
for QNH and QFE are available.
NOTE Although ICAOQNH is ON, you can use the FORM command (on
page 70) to force the display of decimal places on QNH and QFE
values. Because of ICAOQNH rounding, these decimal places are
always filled with zeros.
Query syntax:
>ICAOQNH ?
ICAO QNH : OFF
>
Prompt syntax:
>ICAOQNH
ICAO QNH : OFF ? ON
>
Command line syntax:
>ICAOQNH OFF
ICAO QNH : OFF
>