# Important notes about USB

## <span style="color: rgb(52, 73, 94);">USB 2 and 3 ports</span>

<span style="color: rgb(52, 73, 94);">The supported USB devices are all USB 3 devices and need to be connected to a USB 3 port. You recognize USB 3 ports by a double-S in front of the USB icon. Some USB 3 ports and connectors have blue labeling. </span>

<span style="color: rgb(52, 73, 94);">[![image.png](https://bookstack.noldus.com/uploads/images/gallery/2023-11/scaled-1680-/FJqfoqjtBkmvXvJY-image.png)](https://bookstack.noldus.com/uploads/images/gallery/2023-11/FJqfoqjtBkmvXvJY-image.png)</span>

<span style="color: rgb(52, 73, 94);">[![image.png](https://bookstack.noldus.com/uploads/images/gallery/2023-11/scaled-1680-/zDsPwcvI9LOOMENY-image.png)](https://bookstack.noldus.com/uploads/images/gallery/2023-11/zDsPwcvI9LOOMENY-image.png)</span>

<span style="color: rgb(52, 73, 94);">The Dell Precision T3640 desktop PC sold by Noldus IT has both USB 2 and USB 3 ports. The Dell Precision 3551 mobile workstation only has USB 3 ports.</span>

## <span style="color: rgb(52, 73, 94);">USB hub</span>

<span style="color: rgb(52, 73, 94);">Do not connect your cameras to a USB hub. If you run short of USB connections, connect your license key, keyboard or mouse to a USB hub and connect your USB device directly to the USB port on your computer.</span>

## <span style="color: rgb(52, 73, 94);">Cable length</span>

<span style="color: rgb(52, 73, 94);">USB devices can be connected to the computer without an amplifier with a cable of 5 m. For every subsequent 5 m, an amplifier must be used each. In theory, when using a standard resolution, the cables could be extended this way to 30 m. However we know that not all devices support this.</span>

## <span style="color: rgb(52, 73, 94);">When do I need a USB camera?</span>

<span style="color: rgb(52, 73, 94);">USB cameras are very easy to use. However, the settings may be limited, fo rexample, many USB cameras have fixed zoom. A USB camera may be perfectly suitable for a usability study in which you film a person sitting behind a computer. A USB camera also works very well to create video files for FaceReader. On the other hand, when you need to create a video file of a person further away from your camera, a USB camera may be less suitable.</span>

<span style="color: rgb(52, 73, 94);">For videos with accurate time information, needed for EthoVision XT, you need a high-quality USB camera.</span>

## <span style="color: rgb(52, 73, 94);">Supported USB cameras</span>

- <span style="color: rgb(52, 73, 94);">Basler acA1920-155um</span>
- <span style="color: rgb(52, 73, 94);">Basler acA2040-90uc</span>

<span style="color: rgb(52, 73, 94);">Other USB cameras may also work. However, it could be t.hat you have to change the Color space to MJPG. See <a style="color: rgb(52, 73, 94);">Show frame rate, resolution and format</a></span>

## <span style="color: rgb(52, 73, 94);">Tested setups with EthoVision XT</span>

<span style="color: rgb(52, 73, 94);">The table below shows the maximum supported (1) resolution, (2) frame rate (fps), (3) number of devices and (4) recording time (hours) and (5) whether the test has been carried out on a desktop PC (Dell T3640) or a laptop (Dell 3551) </span>

<div align="left" id="bkmrk-%C2%A0-device-resolution-" width="100%"><table cellspacing="0px" class="table10 ShadedAlternatingRows" dir="ltr"><tbody><tr class="t1Row"><td></td><td><span class="FM_A_SansBold" style="color: rgb(52, 73, 94);">Device</span>

</td><td><span style="color: rgb(52, 73, 94);">Resolution</span>

</td><td><span style="color: rgb(52, 73, 94);">Frame rate</span>

</td><td><span class="FM_A_SansBold" style="color: rgb(52, 73, 94);">No of devices</span>

</td><td><span class="FM_A_SansBold" style="color: rgb(52, 73, 94);">Recording time</span>

</td><td><span style="color: rgb(52, 73, 94);">Desktop or laptop</span>

</td></tr><tr class="t2Row"><td><div align="center"><span style="color: rgb(52, 73, 94);">![Recording_devices00051.jpg](https://bookstack.noldus.com/uploads/images/gallery/2023-12/TEGBVomoO3Q7qW2V-image.png)</span></div></td><td><span style="color: rgb(52, 73, 94);">Basler acA1920-155um</span>

</td><td><span style="color: rgb(52, 73, 94);">1920 x 1200</span>

<span style="color: rgb(52, 73, 94);">1920 x 1080</span>

</td><td><span style="color: rgb(52, 73, 94);">60</span>

</td><td><span style="color: rgb(52, 73, 94);">1</span>

</td><td><span style="color: rgb(52, 73, 94);">0.5</span>

</td><td><span style="color: rgb(52, 73, 94);">D</span>

</td></tr><tr class="t1Row"><td><div align="center"><span style="color: rgb(52, 73, 94);">![inset_4500052.jpg](https://bookstack.noldus.com/uploads/images/gallery/2023-12/OzqhPHChnUpCoGzp-image.png)</span></div></td><td><span style="color: rgb(52, 73, 94);">Basler acA2040-90uc</span>

</td><td><span style="color: rgb(52, 73, 94);">2040 x 2046</span>

</td><td><span style="color: rgb(52, 73, 94);">5</span>

<span style="color: rgb(52, 73, 94);">10</span>

<span style="color: rgb(52, 73, 94);">25</span>

<span style="color: rgb(52, 73, 94);">50</span>

</td><td><span style="color: rgb(52, 73, 94);">1</span>

</td><td><span style="color: rgb(52, 73, 94);">8</span>

</td><td><span style="color: rgb(52, 73, 94);">D</span>

</td></tr><tr class="t2Row"><td><div align="center"><span style="color: rgb(52, 73, 94);">![inset_5200053.jpg](https://bookstack.noldus.com/uploads/images/gallery/2023-12/OzqhPHChnUpCoGzp-image.png)</span></div></td><td><span style="color: rgb(52, 73, 94);">Basler acA2040-90uc\*</span>

</td><td><span style="color: rgb(52, 73, 94);">2040 x 2046</span>

</td><td><span style="color: rgb(52, 73, 94);">25</span>

</td><td><span style="color: rgb(52, 73, 94);">1</span>

</td><td><span style="color: rgb(52, 73, 94);">1</span>

</td><td><span style="color: rgb(52, 73, 94);">D</span>

</td></tr><tr class="t1Row"><td><div align="center"><span style="color: rgb(52, 73, 94);">![inset_5300054.jpg](https://bookstack.noldus.com/uploads/images/gallery/2023-12/OzqhPHChnUpCoGzp-image.png)</span></div></td><td><span style="color: rgb(52, 73, 94);">Basler acA2040-90uc\*\*</span>

</td><td><span style="color: rgb(52, 73, 94);">2040 x 2046</span>

</td><td><span style="color: rgb(52, 73, 94);">25</span>

</td><td><span style="color: rgb(52, 73, 94);">1</span>

</td><td><span style="color: rgb(52, 73, 94);">48</span>

</td><td><span style="color: rgb(52, 73, 94);">D</span>

</td></tr><tr class="t2Row"><td><div align="center"><span style="color: rgb(52, 73, 94);">![inset_5400055.jpg](https://bookstack.noldus.com/uploads/images/gallery/2023-12/TEGBVomoO3Q7qW2V-image.png)</span></div></td><td><span style="color: rgb(52, 73, 94);">Basler acA2040-90uc</span>

</td><td><span style="color: rgb(52, 73, 94);">1920 x 1200</span>

</td><td><span style="color: rgb(52, 73, 94);">60</span>

</td><td><span style="color: rgb(52, 73, 94);">1</span>

</td><td><span style="color: rgb(52, 73, 94);">10</span>

</td><td><span style="color: rgb(52, 73, 94);">L</span>

</td></tr></tbody></table>

</div><span style="color: rgb(52, 73, 94);">\* Tested with output quality settings “EthoVision” and “DanioVision”.</span>

<span style="color: rgb(52, 73, 94);">\*\* Tested with output quality setting “EthoVision”.</span>

<span style="color: rgb(52, 73, 94);">Tested setups for use in The Observer XT - portable set-up</span>

<span style="color: rgb(52, 73, 94);">The table below shows the maximum supported (1) resolution, (2) frame rate (fps), (3) number of devices and (4) recording time (hours). Tests were done on a Dell 3551 notebook </span>

<div align="left" id="bkmrk-%C2%A0-device-resolution--1" width="100%"><table cellspacing="0px" class="table24 ShadedAlternatingRows" dir="ltr"><tbody><tr class="t1Row"><td></td><td><span class="FM_A_SansBold" style="color: rgb(52, 73, 94);">Device</span>

</td><td><span style="color: rgb(52, 73, 94);">Resolution</span>

</td><td><span style="color: rgb(52, 73, 94);">Frame rate</span>

</td><td><span class="FM_A_SansBold" style="color: rgb(52, 73, 94);">No of devices</span>

</td><td><span class="FM_A_SansBold" style="color: rgb(52, 73, 94);">Recording time</span>

</td></tr><tr class="t2Row"><td><div align="center"><span style="color: rgb(52, 73, 94);">![inset_1100056.jpg](https://bookstack.noldus.com/uploads/images/gallery/2023-12/qJQLnUwD6b9KqQyY-image.png)</span></div></td><td><span style="color: rgb(52, 73, 94);">Logitech Brio</span>

<span style="color: rgb(52, 73, 94);">(separate videos, Picture-by-picture &amp; Picture-in\_picture, camera audio only)</span>

</td><td><span style="color: rgb(52, 73, 94);">1920 x 1080</span>

</td><td><span style="color: rgb(52, 73, 94);">30</span>

</td><td><span style="color: rgb(52, 73, 94);">2</span>

</td><td><span style="color: rgb(52, 73, 94);">1</span>

</td></tr><tr class="t1Row"><td><div align="center"><span style="color: rgb(52, 73, 94);">![inset_5500057.jpg](https://bookstack.noldus.com/uploads/images/gallery/2023-12/qJQLnUwD6b9KqQyY-image.png)</span></div></td><td><span style="color: rgb(52, 73, 94);">Logitech Brio</span>

</td><td><span style="color: rgb(52, 73, 94);">4096 x 2160</span>

</td><td><span style="color: rgb(52, 73, 94);">10</span>

</td><td><span style="color: rgb(52, 73, 94);">1</span>

</td><td><span style="color: rgb(52, 73, 94);">0.5</span>

</td></tr></tbody></table>

</div>### <span style="color: rgb(52, 73, 94);">Notes</span>

- <span style="color: rgb(52, 73, 94);">When using the Logitech Brio camera, you have to change the Color space to MJPG. See<span style="color: rgb(22, 145, 121);"> </span>[<span style="color: rgb(22, 145, 121);">Show frame rate, resolution and format</span>](https://bookstack.noldus.com/link/430#bkmrk-page-title)<span style="color: rgb(22, 145, 121);">.</span></span>
- <span style="font-family: 'Open Sans', 'Trebuchet MS', Helvetica, sans-serif; color: rgb(52, 73, 94);">With multiple USB 3 cameras it takes a while before they become visible in MediaRecorder as it takes time for USB 3 cameras to initialize.</span>
- <span style="font-family: 'Open Sans', 'Trebuchet MS', Helvetica, sans-serif; color: rgb(52, 73, 94);">Encoding the video stream of USB 3 cameras requires quite some processing capacity, which increases power consumption. If you use the supported devices on our recommended laptop, be aware that after 1 hour recording the battery level drops from fully charged to 45%.</span>