Download a trial from the sensors

The following steps describe how to download a trial from the sensors where all the sensors used for collection are connected, no data is missing, and you have not yet set up one-click downloading.

For information on other scenarios, see these related topics.

To download a trial from the sensors:

Ensure your Blue Trident sensors are connected to your computer (see Connect sensors to Capture.U Desktop).
If a red circle is displayed in the top right of the Sensors symbol, the Blue Trident sensors need a firmware update.

Before attempting to continue, update the firmware (see Update sensor firmware).
Note that you can't download trials that were captured with the To Sensor mode until the sensor firmware has been updated.
Click Process and on the Captures tab, under Select trial to download, click Edit & download to the right of the required trial.

For reference, sensors with names assigned have the names displayed in brackets next to the serial number of the sensor. In this example, Test1 and Test2 are names that were assigned to TS-00109 and TS-00226, respectively.
The Process tab changes from the Captures tab to the Preview tab, showing preview data.

Note the graph legend at the top right, which enables you to easily identify which curve is related to each sensor. The legend displays an entry for each of the sensors associated with the trial and indicates which color on the graph belongs to which sensor.
An asterisk (*) is displayed when no preview is available for the sensor(s), for example, because data has been deleted from that particular sensor.
Tip: Preview shows the Resultant acceleration, not the captured onboard data.
If required, before downloading the trial, you can edit the capture to rename it, crop it, add notes, and/or change the Save location:
- To rename the trial, click in the Session and/or Trial fields.
- To crop the trial, so that you download only the required region:
  1. Click the Crop button at the bottom right of the graph.
  2. Select the required part of the trial by clicking on the graph then dragging over the relevant region.
    The selected region is indicated by a rectangle. If you need to adjust the size of the selected region, drag the sides of the rectangle.
    In the following example, the selected region excludes the start and end of the trial.
  3. Click Apply to crop the trial.
    
    The time of the trial changes to the cropped time.
- To add notes, click on the Notes tab (bottom left).
- To choose the file type to download, select from:
  - CSV (raw data) The default setting. If your data includes global angles, they are available in the exported _lowg.csv files. They are exported as helical angles (x_deg, y_deg, z_deg) and in a quaternion matrix (qx, qy, qz, qr).
  - Aligned outputs:
    Important: Sensors begin recording asynchronously during the initialization phase of capture and stop recording asynchronously during the de-initialization phase of capture. Aligned outputs temporally align the mutual range of data between all connected sensors. As such, this process requires at least 2 sensors to be connected. If you want all sensors to be aligned, you must cradle and download from all sensors at the same time.
    - X1D For importing captured To Sensor trials into Vicon Nexus. The X1D file consists of .imu and .system files, and is imported into Nexus. If your data includes global angles, when they are imported into Nexus, you can display them in the Graph pane.
    - CSV Exports synchronized sensor data as a CSV file, so that you can directly compare your IMU axes. For example, the Low g (16-g) accelerometer, which captures at 1125 Hz, is synchronized and aligned to the High g (200-g) accelerometer, which captures at 1600 Hz. The CSV file has the filename suffix _aligned. If your data includes global angles, they are exported as helical angles, which are represented as x_deg, y_deg, z_deg, and in a quaternion matrix, represented as qx, qy, qz, qr.
    - Output Rate The rate to which exported CSV data is aligned. Select Output Rate and enter a number between 25 and 3200 Hz. If you don't select the Output Rate, the data is aligned to the highest capture rate (ie, High g acceleration), so all data aligns to 1600 Hz.
      The output rate applies to both the aligned CSV and X1D file to align all data to this rate.
      
      For more information on setting the output rate, see Export aligned data at a specified rate.
- To change the location for downloaded trials, click Save to.
  This displays the File Explorer, enabling you to select the required folder.
When you have finished editing the trial, click Download to save the trial data to your computer.

An orange progress bar indicates the download status.
When the trial has finished downloading, the trial is labeled Downloaded and green check marks are displayed on each sensor.

The trial data and any notes you created are saved in the Save to folder.
For sensors with a name assigned, you will see this noted in the name of the CSV file as well. In this example, Test1 is the name of the sensor.

If you chose the Aligned CSV export option, all the synchronized and aligned CSV files include _aligned on the CSV export.
If you chose X1D export option, the X1D file is exported as .imu and system files.
You can then load this file into Nexus.