Sharper Image LM516 Instructions Manual page 19

Barometric Air Pressure Reading
The actual barometric air pressure is displayed directly under the weather forecast
icon. The relative air pressure is calibrated by the user through the programming
mode.
1. Press SET 13 times to set the measuring unit of air pressure (inHg or hPa).
Press + or - to select either inHg (default) or hPa.
2. Press SET to advance to the relative air pressure calibration. The air pressure
value will flash. Press + or - to set the relative air pressure to the local value
(taken from the local news). Press CH to end.
To toggle between absolute and relative air pressure, press the - key.
Air Pressure History Bar Chart
The bar graph shows the recorded air pressure in hPa (Hekto Pascal) over the past
30 hours. The horizontal axis shows the hours at increments of 30 hours, 24
hours, 18 hours, 12 hours, 6 hours, 3 hours, 1 hour and 0 hours (current). The
vertical axis is set by hPa: the "0" on this axis represents the current hPa and + or
- 1, 3, 5 or 7 shows (in hPa) how high or low the past air pressure was compared
to the current one.
"0" on the vertical axis indicates the current air pressure value. "0" on the hori-
zontal axis indicates the current hour, which is also the current air pressure. Each
bar on the graph represents a value of 0.03 hPa. Each bar has a corresponding
value on the vertical axis.
Air pressure trends can be determined by looking at the bar graph. If the bars are
rising (higher on the right than the left), the air pressure trend is rising and the
weather should improve. If the bars are dropping (lower on the right than the left),
the air pressure trend is falling and the weather should worsen.
The bar chart will constantly scroll to avoid burnout of the LCD. This feature can-
not be turned off.
Features and Operations
19