User's Manual
Page 19
C1:TemperatureorHumidityCalibration
Select you want to type of calibration value and tap , then enter temperature offset rang:-9.0F to
9.0F,default 0F.
Select you want to type of calibration value and tap
, then enter humidity offset rang:-9% to
9%,default 0%.
Note: Humidity is a difficult parameter to measure accurately and drifts over time. The calibration feature
allows you to zero out this error. To calibrate humidity, you will need an accurate source, such as a sling
psychrometer or Humidipaks One Step Calibration kit.
C2:Absolute or Relative Pressure Calibration
Select you want to type of calibration value and tap , then enter absolute or relative offset
rang:-0.27inHg to 0.27inHg, default :0inHg.
Example: The calibrated pressure source measures 28.00 inHg. The display absolute pressure reads 28.83
inHg on the console.
Offset = 28.00 – 28.83 = 0.83 inHg.
Relative Pressure note
Example: The local official barometer measures 30.00 inHg. The display absolute pressure reads 29.92
inHg on the console.
Offset = 30.00 – 29.92 = 0.08 inHg.
Note: The console have two different pressures: absolute (measured) and relative (corrected to
sea-level).
To compare pressure conditions from one location to another, meteorologists correct pressure to sea-level
conditions. Because the air pressure decreases as you rise in altitude, the sea-level corrected pressure (the
pressure your location would be at if located at sea-level) is generally higher than your measured pressure.
Thus, your absolute pressure may read 28.62 inHg (969 mb) at an altitude of 1000 feet (305 m), but the
relative pressure is 30.00 inHg (1016 mb).
The standard sea-level pressure is 29.92 in Hg (1013.2hpa). This is the average sea-level pressure around the
world. Relative pressure measurements greater than 29.92 inHg (1013.2hpa) are considered high pressure
and relative pressure measurements less than 29.92 inHg are considered low pressure.