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6 Barometer Mode
MicroTim XB is primarily for altitude indication. However, it can also be configured to act as a high-precision
barometer when it remains at a constant elevation. Barometer mode is activated by executing a special system
reset.
6.1 Activating Barometer Mode
To activate barometer mode:
1) Begin a system reset by holding down the key for 5 seconds then releasing the key. The system reset
will begin when the key is released. During the reset MicroTim XB will show the serial number ‘sern’ and
firmware revision number ‘frn’ followed by a screen test starting with ‘0000’ and ending with ‘9999’.
2) At any time during the screen test (before ‘9999’ appears) press and hold the key. If this key is being
HELD DOWN as the reset cycle completes (i.e. showing 9999 on the screen) then MicroTim XB will enter
barometer mode. Do not release the key until ‘baro’ appears on the display. MicroTim XB is now in
barometer-mode and you may release the key.
6.2 Calibrating the Barometer
When set to barometer mode, MicroTim XB assumes a barometric pressure of 29.92 inches of mercury. This
reading needs to be calibrated to your elevation. Once it has been calibrated, the barometer will read correctly
always, unless MicroTim XB is moved to another elevation.
6.2.1 Calibrating Barometer Mode by Known Elevation
If you know the elevation MicroTim XB is at, you can calibrate the barometer by entering this elevation. Press the
keys until the correct elevation appears on the screen. The elevation will increment in 9.3 foot steps,
equivalent to 0.01 inHg at sealevel. Select the elevation closest to your true elevation. After no keys have been
pressed for 5 seconds, MicroTim XB will stop displaying the reference elevation and show the correct barometric
pressure.
6.2.2 Calibrating by Known Barometric Pressure
Note that alternatively you may simply know the current barometric pressure in your area and use the
keys to force MicroTim XB to this value. From then on, MicroTim XB will display the correct barometric pressure.
6.3 Using the Barometer
In barometer mode, MicroTim XB displays the barometric pressure constantly. MicroTim XB updates the reading
once per minute. After an idle period of approximately 30 minutes, MicroTim XB will power down. The barometer
will resume operation any time afterward by turning the unit back on (holding the key until ‘boot’ appears on
the display).
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