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FARO® Knowledge Base

On-Site Compensation Instructions for the Focus S Series

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Overview

The On-Site Compensation process is a procedure to test and improve the angular accuracy of the scanner using SCENE software. Note: On-Site Compensation is only available on FocusS models.  

Prepare

Time to Complete

20 minutes
Skills Needed
  • General knowledge of Microsoft Windows
  • General computer skills
  • Basic knowledge of the Laser Scanner
  • Basic knowledge of SCENE
Supported Software
  • SCENE 7.0 or later
Supported Hardware
  • FARO® Laser Scanner FocusS 70 
  • FARO® Laser Scanner FocusS 150
  • FARO® Laser Scanner FocusS 350

Preparation Before Compensation

Site setup

Before you begin the On-Site Compensation process, ensure that the scan site has the following facilities:

  • No windows or other reflective planes: The markers on the target sheets would be reflected if the scan site has any windows or reflective surfaces. This can cause incorrect measurements.
  • Lighting conditions are less important because On-Site Compensation is done with the laser, video images are not used.

Connect Laser Scanner to Computer through Wireless LAN

To be able to transfer the scanned data directly to your computer, you must connect the computer with the laser scanner and through WLAN to remotely access and control the scanner.

To connect to the scanner directly, follow this procedure.

  1. Power on the scanner.
  2. Navigate to Manage > General Settings > WLAN.
  3. Toggle the Status button to the ON position.
  4. Set the Mode to Access Point.
  5. Write down your scanner's IP Address and make note of the Network Name.
  6. On the PC, find the scanner network in the list of available networks.
  7. Connect using the password: 0123456789

Note: The scanner's network is limited to a data transfer rate of 54 Mbit/s. For a faster connection, you can connect to the scanner over a local network by setting the Mode to WLAN instead of Access Point. This allows for transfer speeds up to 150Mbit/s in 5GHz networks.

Check Network Security Status

  1. Open your network list.
  2. Click Properties for the scanner network.
  3. Make sure Private is checked.

If you are experiencing connection issues, your firewall or Windows Group Policy may be blocking the data transfer. Click here for setup/troubleshooting information. For additional connection information, download the Focus scanner manual.

Printing Target Sheet

If you need compensation target sheets, you can download and print them or print them from SCENE

  1. Click the Scanning Ribbon.
  2. Click Open Target PDF.
    OnSiteCompensation.png
  3. Print at least six copies of the PDF using the DIN/ISO A4 format or US letter format. Note: Do not use reflective paper or printers that use reflective ink.

Place Targets

  • Place at least six target sheets on the site.
  • The target sheets must be placed in a vertical range of -50° to +50° from the scanner device. Note: Under some circumstances, +50° can only be achieved if the target is placed on the ceiling.
  • Distribute the target sheets uniformly over the specified range. At least one board must be close to the horizon (0°).
  • The distance between the target sheets and the scanner must be between 1.5 m to 3 m.
  • All target sheets must be vertically aligned.

Laser Scanner Placement

  • Mount the laser scanner on a tripod.
  • Place tripod and scanner on stable, flat surface. The tripod must not move during scanning.
  • Keep the distance between the target sheet and the scanner between 1.5m to 3m.
  • Adjust the tripod to keep the scanner horizontal.
  • Either 0° or 180 ° directions can be used for the horizontal rotation direction toward the target.

SiteLocationExample.png
Site location example:
- Distance between target and scanner: 1.7m
- Scanner installation height: 1.12m
- Target top height: 2.2m

On-site Compensation

Compensate with SCENE according to the user's manual and execute scanning and correction.

  1. In SCENE, Connect your PC to your scanner.
  2. Click Start On-Site Compensation in the Scanning ribbon.
    OnSiteCompensation.png
  3. Select an output folder to store compensation data.
  4. Enter the IP address of the laser scanner.
  5. You can find the IP address by tapping Manage > General Settings > WLAN > IP Address on the scanner user interface.
  6. Click Connect.
  7. Verify that the targets and scanner are positioned as described above. Click Place Targets.
  8. Click on Horizontal Alignment
  9. Click Scan & Compensate.
  • When the compensation is finished, the Compensation Report is displayed with the results of the compensation. Open the compensation report ad PDF by clicking the button Open Report.
  • Log data is stored together with Compensate report. (About 300 Mb with all data). Most of the data is scan data. Be sure to erase it properly when compressing the disk capacity 
    CompReportScreen.png
  • To apply this compensation to the scanner choose Yes and click Finish. Choose no if you do not want to apply this compensation.
  • You can then disconnect from the Scanner.

Troubleshooting

Error: The process did not identify enough targets for compensation.

  • Solution: In the output folder a targetImage.png file is stored. This image shows the identified markers as blue circles. Areas with a sufficient amount of detected targets have a green background color. In case of an insufficient amount of detected targets the background color is red.

TargetImagePass-Fail.png

Error: Reading and writing to the selected data output folder failed.

  • Solution: Make sure that you have permission to read and write in the selected output folder. Ensure that you have sufficient disk space. Approximately 330MB is necessary to perform an On-Site compensation.

Error: No consistent solution could be determined.

  • Solution: Make sure that the tripod and the targets did not moving during the procedure.

Error: The SD card of the scanner could not be accessed.

  • Solution: Make sure that the SD card is inserted and that it is not write-protected and has sufficient free space left (approximately 330MB).

Error: Communication with the scanner failed.

  • Solution 1: Make sure that the WLAN connection to the scanner is stable. If this error appears when connecting to the scanner or applying the compensation parameters, try to repeat the corresponding step.
  • Solution 2: Enable SMB 1.0 protocol. Open “control panel” > “All control panel Items” > “Programs and Features” > “Turn Windows features on or off”. A window opens; please search for “SMB 1.0” in the list. Tick the box, and activate this feature. Reboot your PC.