Setting Up Dynolicious Log Box
Required Setup
Calibration
Before using Dynolicious Log Box for the first time*, you need to calibrate the accelerometers.
The iPhone’s accelerometers are not calibrated from the factory. For any given axis, the value returned from the accelerometer may be off by as much as 33%. The calibration function allows Dynolicious Log Box to compensate for this error and generate accurate results.
To perform calibration, press “Perform Calibration” from the Setup screen, then perform the following:
- Hold the phone in the orientation shown on screen. For each direction, the phone should be held as level and steady as possible. Best results will be achieved by resting the phone on a level surface during the test. Hold the phone in the orientation until you hear a beep and the screen changes.
- Once all seven orientations have been calibrated, you will see “Calibration Successful” on the screen. You may now use the button in the top left to return to the Setup screen.
NOTE: Although it is imperative that you calibrate the iPhone before using Dynolicious Log Box for the first time, you may want to take note that the accelerometers in the iPhone are somewhat temperature sensitive (they may drift as much as 2%). For best results, you should consider re-calibrating Dynolicious in the same environment in which the test will be performed if high quality accelerometer data is needed.
Optional Setup
Sample Rate
Sample rate is the number of samples per second/minute/hour that the device will capture. You will notice that the available recording time varies depending on the number of samples. It is recommended that you choose the slowest sample rate that will produce valid results.
Auto Orient
Auto orientation will use gravity to set the Y and Z axis before you start logging. Dynolicious Log Box will orient itself when you tap the “reset” button on the logging screen if you’ve enabled auto orientation.
With auto orientation off, Dynolicious Log Box will use the device’s static Y and Z axis for logging. The static Z axis is perpendicular to the screen (an invisible line through the device intersecting the screen and going through the back of the device). The Y axis is parallel to the screen (an invisible line from the dock connector through the sleep connector).
Low-pass Filter
The accelerometers in the iPhone and iPod touch tend to be noisy and there is some variation in the data received from them. The low-pass filter helps eliminate both noise, but also vibration from the accelerometer data.
