Updated: 2014-01-16

© SignalQuest, LLC

2014

10 Water St.

Lebanon, NH 03766 USA

Tel: 603.448.6266

Fax 603.218.6426

www.signalquest.com

info@signalquest.com

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Gravity means a vector pointing from the device toward the center of the earth.

X means a vector parallel to the “X” arrow printed on housing label

Y means a vector parallel to the “Y” arrow printed on the housing label

Z means a vector passing through “Z” arrow printed on the housing label

Horizontal means the arrow is pointing at a right angle to gravity.

Straight Down means the arrow is parallel to gravity.

Straight Up means that the arrow is anti-parallel to gravity (i.e. pointing toward the sky).

Plumb Line is a line with a weight on the end hanging straight down.

In Dual-Axis Mode the X Tilt and Y Tilt angles are measured between gravity and the arrows printed on the housing label. If

you passed a Plumb Line through the sensor’s X, Y, Z origin, the X and Y Tilt angles could be measured by placing a

protractor’s straight edge on the plum line and then reading the angles made with each arrow.

Y Tilt = Pitch (first angle)

X Tilt = Roll (second angle)

Holding Y Horizontal

When X is Horizontal, X Tilt = 90 º.

When X is Straight Up, X Tilt = ~180 º.

When X is Straight Down, X Tilt = ~0 º.

Holding X Horizontal

When Y is Horizontal, Y Tilt = 90 º.

When Y is Straight Up, Y Tilt = ~180 º.

When Y is Straight Down, Y Tilt = ~0 º.

In Single-Axis Mode, the Z Rotation angle is defined as a rotation about the Z axis of the sensor. For the Z Axis Rotation

angle to remain in range, the Z Axis must be near horizontal. The Z axis should be kept to less than ± 45 º of deviation from

.

When X is Horizontal, Y is Straight Up, Z Rotation = 0 / 360 º.

When Y is Horizontal, X is Straight Down, Z Rotation = 90 º.

When X is Horizontal, Y is Straight Down, Z Rotation = 180 º.

When Y is Horizontal, X is Straight Up, Z Rotation = 270 º.



Regardless of the mode, the inclinometer measures angles with respect to gravity. It cannot measure rotation about

the gravity vector. All rotations about gravity are invisible to the sensor and are considered equivalent.