Eagle Tree Vector - Manual (Page 77)

USER GUIDE
77
If your current sensor’s true offset is 300mA, and the current offset is set to 0.3 in the menu, the Vector will
always read 0.3 amps when the current draw is less than or equal 0.3 amps, but when the current climbs above
0.3 amps, the Vector will correctly read that current. If your amp meter shows that you are drawing greater
than 0.3 amps when your motor is not running (due to your video camera, video transmitter, the Vector, and
other accessories), but the Vector is reading 0.3 amps, increase this setting until the Vector matches your
meter’s reading. Note that an incorrectly set offset will only cause a very slight amount of error, so changing
the offset is generally not needed.
7.7.2 Altimeter Calibration
The Vector’s altimeter is factory calibrated. When the Vector has been unpowered for a while, it is normal for
a small amount of altimeter drift to occur over a few minutes, as the Vector warms up. When you reset the
home position, or when you arm your multirotor, the Vector’s altimeter is automatically rezeroed, erasing any
drift.
But, if you see your Vector’s altimeter drifting more than a few feet (1-2meters) during warmup, and that is
causing issues for you, you can calibrate it as follows:
1) Make sure that the weather is not changing, which can cause significant barometric pressure
differences in a short period of time.
2) Leave the Vector completely unpowered for at least 30 minutes.
3) Have your transmitter ready, and apply power to the Vector (do this indoors).
4) Within 1 minute (the quicker the better) navigate to the Calibration and Sensors menu, select the
“Altimeter cal (read manual)” item, and click the mode switch.
5) Don’t move the Vector until the calibration process completes (about 3 minutes).
6) The calibration result (pass or fail) will remain in the notification area after the process completes.
7.8 GPS Configuration
Several settings for the GPS are provided, on the GPS Configuration menu.
7.8.1 Choosing the GPS Position Display Format
The GPS position can be displayed in 3 formats, controlled by
the “GPS-On-screen display format” setting:
t) Decimal degrees (DDD.DDDDD°)
u) Degrees, minutes (DDD° MM.MMMM')
v) Degrees, minutes, seconds (DDD° MM' SS.S")
The GPS position display is most useful for letting you locate a
lost model by entering the last displayed GPS position into a mapping program (such as Google Maps™) on your
laptop or phone.
Many mapping programs will accept all three formats, but check to see which ones your program supports
BEFORE you might need to use it!
7.8.2 Changing the GPS Fix Quality Settings
In the “GPS Configuration” menu, several options are available for setting criteria for the minimum fix quality
required. These criteria must be met before the home GPS position is finalized after boot-up.