Meriam M203 Altimeter Indicated Air Speed Tester - Manual (Page 14)

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6. If METRIC units are
desired, press the
▲ or ▼
arrow key
Top line reads “UNITS
SELECT” and bottom line
reads “METRIC”. Units are
set to METERS and km/h.
7. Press the PRGM key. Top line reads
“PROGRAM MODE” and
bottom line reads “UNITS
SELECT”.
8. Press the ◄ key. Manometer returns to
Measure Mode displaying
Altitude.
1. Altitude is the default measurement when ALT /IAS Mode is active.
2. If ALT / IAS Mode was active upon manual or automatic shut off, ALT / IAS
Mode will be restored upon cycling power and altitude will be displayed.
3. When the M203 is displaying air speed and power is turned off (manually or
automatically), Program Mode is entered, or the Tare key is pressed, the unit will
be returned to altitude display once power is cycled or the unit is returned to
Measure Mode. This is a feature designed to prevent errors in air speed
measurement, necessary because of the tare function employed on barometric
pressure to arrive at air speed measurements. Barometric pressure fluctuates with
changes in weather conditions. Reverting to altitude measurement upon powering
down, entering Program Mode or pressing the Tare button forces a new tare value
to be taken prior to each air speed measurement session.