6.2.5 “Flaps, Trim and Special Function Calibration” Screen:
This screen allows you to calibrate Flaps, Trims and special functions. A voltage signal is received from a
control pot connected to the flaps (or trim tab). The value of this signal is called “Raw Counts.” The Raw
Counts should change as the flap position changes. To scale these Raw Counts to a meaningful value perform
the following:
“1. Select the function and its voltage source.”
“Function”: Select the function to be calibrated.
The function must be mapped into the MVP to be
available (see the “EDC Inputs, Functions, and Screen
Setup” section of this manual).
“Powered By”: The control pot can be powered by
the aircraft bus (preferred) or the by the EDC. If the
control pot is powered by the aircraft bus, the MVP
must do a ratio metric calculation to insure the flap
readings do not change when the bus voltage changes.
“2. Set the maximum Display values below.”
“Max Upper (or Right) Value:” Enter the
maximum up or right value. This would be “0” degrees for flaps.
“Max Lower (or Left) Value:” Enter the maximum down or left value. This may be “40” degrees
for flaps.
Note: For Trims these values may be +30 degrees to -30 Degrees.
“The display value (INCREASES / DECREASES) when the “Raw Counts” increase.”
Determine whether you want the “Displayed Value” to increase or decrease as the Raw Counts (as
shown to the right of the Horizontal Strip Gauge) increase. You may want to watch the Raw Counts as
you cycle the control.
“3. Select “Calibration” below, then cycle the control through its full range a few times.”
The MVP performs an automatic calibration by scaling the maximum and minimum Raw Counts to the
“Max Upper” and Max Lower” values you previously selected. As you cycle the control through its
range a few times the max and mix reading on the Horizontal Strip Gauge should match your
programmed values.
“Gain” and “Offset” The automatically calibrated gain and offset values can be changed manually to
achieve a specific Displayed Value for a specific control setting.
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