G SERIES PILOT’S GUIDE .
INSIGHT
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In order to use the auto range function it must be turned on as described above. Once this function is enabled, the G3-4
will automatically adjust the EGT MAX TEMPERATURE and AUTORANGE INFLECTION to be appropriate for the highest
temperature reported by the probes.
You should now take the airplane and perform a typical flight.
The G3-4 will analyze the EGT temperatures and scale the temperature bars as required so that the entire temperature
range measured by the EGT probes is displayed on the main bargraph screen.
It is important to realize that so far this adjustment is temporary. If we want it to remain permanent we must return to the
User Configuration screen.
To save the results of auto ranging:
Press the SEL button to select line 2 (EGT AUTORANGE).
Turn the SEL knob to select SAVE on line 2.
Press the SEL button to select line 7 “SAVE CONFIG”
Turn the SEL knob to select YES on line 7.
Press the SEL knob to save the choice.
The results are saved, and auto ranging is turned OFF.
The main temperature bargraphs should now be scaled properly for this individual airplane on all subsequent flights.
Auto ranging may be turned on and the range relearned as often as desired.
Setting up the G3 Temperature Bargraph display manually (Method 2):
In some cases it may be desirable to set or refine the temperature bargraph screen manually.
To do so, return to the User Configuration screen and make sure EGT AUTORANGE is turned OFF as described earlier.
Adjust EGT MAX TEMPERATURE and AUTORANGE INFLECTION directly by using the following procedure:
To set an EGT MAX TEMPERATURE and AUTORANGE INFLECTION on the User configuration screen:
Press the SEL button to select line 3 (AUTORANGE INFLECTION) or line 4 (EGT MAX TEMPERATURE).
Turn the SEL knob to select a value as desired. Notice that adjusting the AUTORANGE INFLECTION affects the value of
EGT MAX TEMPERATURE and vice versa.
Press the SEL button to select line 7 “Save Config”
Turn the SEL knob to select YES on line 7.
Press the SEL knob to save the choice.
AUTORANGE INFLECTION and EGT MAX TEMPERATURE explained:
The Autorange Inflection point is the point along the temperature graph at which the scale of the bars change.
Below the inflection point (ie, at low temperatures) readings are displayed with a coarse resolution (the bars go up/down a
small amount for a relatively large change in temperature).
Above the Inflection Point (at higher temperatures than the Inflection Point) the bars are displayed in a higher resolution
(the bars go up/down more for a small change in temperature).
The net effect is that the dynamic range of the temperature bargraph is increased. In other words, we can show tempera-
tures all the way down to room temperature on the bargraph yet still show small changes in temperature at the airplane’s
operating temperature range.
As an example if we set our Autorange Inflection to be 1200 deg then temperatures below 1200 will be rendered with rela-
tively few pixels/degree whereas temperatures above 1200 will be rendered with more pixels/degree to make temperature
changes more obvious.
