Goniometer (GNM-BTA)

Specifications and User Guide

Troubleshooting

• Primary Test: Plug the probe into an interface and launch the data-collection software. Rotate the flexible arm of the Goniometer so it is open at 180º. Verify that the the data-collection software reports an angle of 180º (±3º) without calibration.
• Secondary Test: Calibrate the sensor. Perform a one-point calibration at 180º using the data-collection software. Verify that the data-collection software reports an angle of 180º (±1º) with calibration.
• Tertiary Test: Verify that the terminal edge of the joint arm is aligned with the set screw on the side of dial. Reposition the flexible arm of the Goniometer if necessary. Follow the directions for calibrating the sensor that can be found in the sensor booklet.

Additional Troubleshooting

• Do I need to calibrate the Goniometer?
• What is the best way to attach the Goniometer to a subject?
• My forearm / foreleg is too big for the 14-inch strap that comes with the Goniometer? How can I attach the flexible arm to my limb?
• How do I change the reporting direction of the Goniometer?
• How do I remove / change the flexible arm on the Goniometer?
• How do I get the Goniometer to report both positive and negative joint angles?
• Is there a way to automatically calculate Cadence or Step Rate with the Goniometer?
• Is there a way to automatically calculate the amplitude of the range of motion using the Goniometer
• Do you sell a Goniometer or Tilt Angle Sensor?
• Is there a way to automatically calculate Heart Rate, Cadence, and Range of Motion with the Goniometer and a Heart Rate Monitor?
• Is there a good way to attach the EKG sensor to the stationary arm of the Goniometer so the sensor box is out of the way during experiments?

Specifications

• Range: 0–340º (or ±170º)
• Accuracy
  ⚬ with factory calibration: ±3º
  ⚬ with one-point calibration: ±1º
• Resolution: 0.12º
• Calibration Coefficients
  slope: 90°/V
  intercept: –45°

Calibration

Calibrate? No. The probe is set to match the stored calibration before shipping. If you choose to calibrate the probe, conduct a one-point calibration at 180 degrees. You may also want to zero the probe before using it. This will provide both negative and positive angles.

For more information on calibrating a sensor, see How do I calibrate my sensor?