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Chapter 2--Operation 11
13. Click on the IntelliCal button to open IntelliCal.
14. Select the Target Accuracy and then click on Start Calibration.
15. The calibration process will start and continue to completion without any further actions required from
you. Calibration can take several minutes, especially if you have selected Fine for the target accuracy. Be
patient.
16. When the calibration has finished, the Accuracy (residual value is shown relative to the target value),
Center Wavelength, and Error (in Δ nm) are reported. The buttons displayed when calibration stops
depend on the reason the calibration stopped and the error value.
If IntelliCal determines that the error value is too high (the icon is displayed), you will not be allowed
to use the calibration.
If you stop the calibration before it has finished, you have the choice of resuming the calibration (the
Resume Calibration button will be displayed) or discarding it.
If calibration has finished and the error is high (the icon is displayed), you will have the choice of
resuming calibration, using the current calibration, or discarding it.
17. If you click on Resume Calibration, the dialog will remain open and the calibration process will
continue from the point at which it stopped: this gives IntelliCal additional time to refine the calibration.
If you click on Use or Discard, the dialog is closed. If you selected Use, the X axis in the viewer will be
changed to Nanometers (if these are the default wavelength units).
18. Reset the Shutter Mode to Normal.
19. You may want to take a single spectrum to confirm the calibration.
20. Turn off and remove the light source.
Focus Adjustment
When purchased with a Princeton Instruments CCD detector, the LS 785 is
normally focused and aligned at the factory and shipped as an integrated
system ready to operate. In this instance no further adjustments are required.
We do recommend focus adjustments in the following instances:
1. The grating has been adjusted to a new wavelength position.
2. A CCD is purchased separately from the LS 785 and is being
installed at the customer’s facility.
3. The CCD has been removed from the LS 785 and is being re-
installed.
4. The user wishes to check or optimize focus.
Procedure:
1. Mount a neon light source to the entrance port and set the entrance
slit width to 20 µm.
2. Locate the FOCUS ADJUSTMENT micrometer at the rear of the LS 785.
3. Rotate the Focus Adjustment locking nut counter-clockwise to unlock the micrometer spindle.
4. Power on the LS 785, CCD detector, and neon light source.
5. Start LightField and after the LS 785 and CCD detector are detected, move their icons into the
Experiment Devices area.
Figure 2-7. Focus Adjustment
Micrometer