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The laboratory technician calibrates the system when needed by adjusting camera settings and analyzing an imaged Kodak Q13 grayscale standard.
Calibration adjustments are performed using an iterative process of imaging a ruler placed crosswise on the track then counting the pixels between millimeter marks, moving the camera up or down, and repeating. See for details on this procedure.

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Common problems encountered when using the core imager and their possible causes and solutions:

Issue

Possible Causes

Solution

Actuator squeal

NA

Lightly tap the actuator housing to silence the noise

Image too dark

Manual F-stop on the camera closed down

Have technician adjust F-stop aperture

 

Exposure time is too low

Increase exposure time

 

Focused lights are not aimed at the correct spot

Adjust lights

Track is "stuck"

Run was aborted with the software abort switch

Reset software and run sample again

 

Run was aborted with the hardware abort switch

Reset hardware and run sample again

 

Gantry flag has tripped the end-of-travel limit switch

Adjust gantry flag and run sample again

 

Current limit on motors was exceeded

Check the Galil AMP-19520 for LED error indicators. Call track technician or ET to reset the motor controller

 

Torque limit on motors was exceeded. <we need to check how Labview handles this!>

 

Image indicates that camera was triggered erratically OR no image acquired

Camera was left in Free Run mode in MAX

Set camera to Externally Triggered for normal operation

 

Linear encoder head has failed

Call an ET to verify/repair

 

Lens cap is on

Remove cap and repeat image capture procedure.


Scheduled Maintenance

Frequency

Task

Daily

Ensure that the color standards, ruler, and barcode imager lens are free from dust, smudges, and crumbs.

Weekly

Using a mirror, ensure that there are no fingerprints or smudges on the camera lens. Call the imaging specialist if the lens needs cleaning. Do not attempt to clean it yourself!

Monthly

Check socket head cap screws in the camera and lights mounting plates for looseness.

Every Expedition

  • At the beginning of each cruise the track technician should verify the camera corrections and settings by imaging a Kodak Q13 grayscale standard. Adjust camera configuration as needed.
  • At the end of the expedition the technician should verify with the MCS that all image data have been accounted for and backed up, then delete any remaining images and discards from the local hard drives to comply with moratorium policy. Note that if a large number of images are acquired in an expedition, this may have to be done mid-cruise.

Annually

  • The technicians should remove the end covers on the linear actuators and check if the motor belts need tightening.
  • Examine the cable management system for abraded cables or other indications of wear.
  • Remove the top covers of the linear actuators and check the ball screws to see if they need cleaning or additional lubrication.

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