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Chapter 7: Weather Corrections
Correction Factors
The current weather conditions- temp, relative humidity and absolute barometric pressure can be used so that
corrections can be applied to the data. This allows tests to be corrected to a standard set of atmospheric conditions and
allows consistency as the environmental test conditions change. If manually applying (eg. from a third party weather
station) then it’s important to keep an eye on your weather station whilst running tests, you will be surprised how quickly
conditions change!
An optional accessory USB device called ‘Weather Watch’ is available that automatically interfaces with DYNertia3 and
updates the readings at regular intervals. Refer to this manual under ‘Menu options- “Setup/Communications” for details
on connecting (known as ‘Linking’).
NOTE: Barometric pressure figure used should be ‘absolute’ and not ‘corrected’. Corrected is given in the typical news
weather report. We want the actual measured pressure at the Dyno and not one corrected to sea level.
Correction to world standards SAEJ607, SAEJ1349, DIN70020 or uncorrected can be applied via the menu option
“setup/software/System”. The correction factor being applied, weather data entered and the selected correction
standard are recorded automatically with each test for reference. SAE J607 is chosen by default as it is in widespread
use.
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