2
Specifications
Range
0–340º (or ±170º)
Accuracy
±3°
±1° (with calibration)
12-bit resolution
0.12°
Stored Calibration Values slope: 90°/V
intercept: –45°
Suggested Experiments
Measure the range of motion of various anatomical joints
Students measure the range of motion of different anatomical joints in this
exercise. The knee, elbow, hip, wrist, ankle, and hand can all be measured using
the Goniometer. Standard bony landmarks are used to mark the axis of rotation for
each joint. As a result, the Goniometer does not need to be attached to the subject
for this exercise.
Measure the range of motion of the elbow or knee during physical activity
In this type of activity, the Goniometer is attached to the subject’s arm or leg. The
range of motion of the joint is then recorded during physical activity. Standard
weight lifting exercises can be used for the leg and arm, such as squats, leg
extensions, bicep curls, dips, and triceps extensions. As shown in Figure 3,
dynamic range of motion can be studied during running. Dynamic range of motion
can also be studied while cycling
Figure 3
Measure the activity of different muscle groups during limb movement
In this type of activity, the Goniometer is used with one or more EKG Sensors to
measure the electrical activity of different muscle groups during physical activity.
Standard weight lifting exercises can be used for the leg and arm. The bicep curl is
an excellent exercise for this lab. As shown in Figure 4, bicep activity increases
during flexion and will decrease during extension.
You can easily increase the length of the 14-inch strap if it is too short to
comfortably wrap around the foreleg or forearm. Thread the second 14-inch strap
through the eyelet of the first strap. Fold the second strap over itself so that the
hook and loops lock. This will increase the length of the strap by 8 inches.
Calibrating the Sensor
Optional Calibration Procedure
Calibrating the Goniometer may not be necessary for some activities. If you are
evaluating the range of motion of a joint, such as the knee or elbow, then the
stored calibration should work well. For dynamic analysis of a joint you may want
to calibrate the sensor before attaching it to a subject. The instructions for
calibration are dependent on the data-collection software you are using.
Calibrating the Goniometer with Logger
Pro
1. Choose Calibrate from the Experiment menu. Click Calibrate Now in the
Sensor Settings dialog box.
2. Select the box marked One Point Calibration. Click the Calibrate Now button.
3. Rotate the flexible arm of the Goniometer until it is positioned 180º from the
stationary arm, as shown in Figure 2.
4. Verify that the set screw on the side of the dial is aligned with the silver dot on
the baseplate. Reposition the dial if necessary.
5. Enter 180º for Value 1. Click Keep, and then click OK.
Figure 2
Calibrating the Goniometer with LabQuest App
1. Choose Calibrate from the Sensors menu. Select the box marked One point
calibration. Tap the Calibrate Now button.
2. Rotate the flexible arm of the goniometer until it is positioned 180º from the
stationary arm. Verify that the set screw on the side of the dial is aligned with
the silver dot on the baseplate of the sensor.
3. Enter 180º for Value 1. Tap Keep, and then tap OK.
Calibrating the Goniometer with Graphical Analysis
1. Click the Angle meter and choose Calibrate. Choose One-point calibration
from the Calibrate menu.
2. Rotate the flexible arm of the Goniometer until it is positioned 180º from the
stationary arm. Verify that the set screw on the side of the dial is aligned with
the silver dot on the baseplate of the sensor.
3. Enter 180° for the first known value. Click or tap Apply to complete the
calibration process.
