Eagle Tree Systems GFORCE-HIGH - Manual (Page 2)

Copyright © 2011 Eagle Tree Systems, LLC
http://www.eagletreesystems.com
Page 2
If you have the High G sensor, and wish to measure vertical force greater than 8 g, you can mount the sensor so that either the X or Y axis is
vertical.
Range check: It is extremely unlikely that the installation of the G-Sensor will affect your model’s radio range or control. But, as always
after making an electronics change to your model, it is very important that you range and function test your model once the G-Sensor is
installed to ensure that there is no impact on your system.
Using the G-Sensor in Standalone Mode
Powering the G-Sensor in Standalone Mode
For standalone mode (not connected to an eLogger), connect the Standalone Cable
to the gold pins of the G-Sensor, as shown in Figure 1. The polarity of the
connection is as follows:
RED = Positive (Vdd)
BLACK = Negative (ground)
Note that the RED wire of the standalone cable corresponds with the red dot on the
label.
The JR/Universal servo end of the Standalone Cable connects to a spare Receiver
channel or small battery. Note that the voltage must be between about 4V and 16V
(4V to 6V for the High G sensor). Do not exceed 16V with the low G sensor, or 6V with the High G sensor!
IMPORTANT: Ensure that you connect the Standalone Cable with the correct polarity, or the G-Sensor could be damaged, voiding
the warranty! Note that in Standalone Mode, the 4 wire cable built into the G-Sensor must NOT be connected to anything!
The Trigger G-Force
Upon power up, the G-Sensor will display a single digit representing the “trigger” G-Force. This represents the number of g’s (either positive
or negative) that the sensor must experience on at least one of its axes before it will overwrite the previous session’s maximum values with
new readings (after power is disconnected and reconnected). The trigger G-Force can be changed as described below.
Display of the Maximum Values Encountered
After power up, the G-Sensor repeatedly displays the maximum values that were last
captured, cycling through the X, Y and Z axes. When displaying the values, the LED
first displays the axis symbol, then the G-Force reading for that axis. It does this
sequentially for each axis in the order of X, Y and Z.
The value itself for each axis is displayed with the sign first (if negative), then the most
significant digit, followed by each successive digit down to the first decimal place.
In the example at right, the maximum values detected during the session were: X = 0.6 g,
Y = 4.1 g,and Z= - 3.2 g.
Note that the “absolute value” of readings is used to compute the maximum. For
example, a value of -2 g sensed by the G-Sensor is greater than a value of +1.5 g, and
hence -2 will be displayed for that axis.
During a session, once the trigger G-Force is encountered on any axis, the sensor then
records all the values at that moment as the maximum values. Then, during the rest of
the session, any value for a particular axis that is greater than the presently recorded
value for that axis, replaces the prior recorded value. So, at the end of the session, the
maximum values encountered in each axis are displayed.
Rearming the Trigger G-Force
When the G-Sensor is disconnected from power and reconnected, the values stored from the last session are still displayed. But, the power
cycle rearms the trigger G-Force. When this trigger G-Force is encountered in your next session, the values from your last session are
overwritten with the new maximum values, even if the new maximum values are less than the maximum values you encountered in your last
session.
Changing the Trigger G-Force
By default, the trigger G-Force is set as 2 g. The other available values are 3, 4, and 5 g.