Ambient Weather WS-1173A Benutzerhandbuch - Seite 10
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around the world.
Relative pressure measurements greater than 29.92 inHg (1013 mb) are
considered high pressure and relative pressure measurements less than 29.92 inHg are considered low
pressure.
To determine the relative pressure for your location, locate an official reporting station near you (the
internet is the best source for real time barometer conditions, such as Weather.com or
Wunderground.com), and set your weather station to match the official reporting station.
Reference Section 4.2 Set (Program) Mode on how to program this feature.
4.2.2 Setting Calibrated Humidity
The display console allows you to calibrate both the indoor and outdoor humidity. 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, available from Ambient Weather, which uses a
salt bath.
To calibrate the indoor or outdoor humidity, in the Set Mode with the indoor or outdoor humidity
flashing, press the
key or MIN/MAX key to increase or decrease the indoor or outdoor humidity
+
setting (in increments of 1%) to match the calibrated or known humidity source. Reference Section
4.2 Set (Program) Mode on how to program this feature.
Note: The remote (outdoor) thermo-hygrometer will always display the measured humidity level
and not the calibrated humidity level. Only the console will show the calibrated value.
Note: The dew point calculation is based on the calibrated humidity level.
4.2.3 Setting Calibrated Temperature
Temperature is measured by a resistive thermal device (RTD) and is subject to electronic variation.
Temperature errors can also occur when a sensor is placed too close to a heat source (such as a
building structure, the ground or trees).
To calibrate the indoor or outdoor temperature, we recommend a mercury or red spirit (fluid)
thermometer. Bi-metal (dial) and other digital thermometers are not a good source and have their own
margin of error. Using a local weather station in your area is also a poor source due to changes in
location, timing (airport weather stations are only updated once per hour) and possible calibration
errors (many official weather stations are not properly installed and calibrated).
Place the sensor in a shaded, controlled environment next to the fluid thermometer, and allow the
sensor to stabilize for 24 hours. Compare this temperature to the fluid thermometer and adjust the
console to match the fluid thermometer.
To calibrate indoor or outdoor temperature, in the Set Mode with indoor or outdoor temperature
flashing, press the
+
key or MIN/MAX key to increase or decrease the temperature setting (in
increments of 0.1 degC or 0.18 degF) to match the calibrated or known temperature source.
Reference Section 4.2 Set (Program) Mode on how to program this feature.
Note: The remote (outdoor) thermo-hygrometer will always display the measured temperature
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