Princeton Instruments NIRvana-LN, User Manual, Page: 93 / 122

Chapter 10 Troubleshooting 93
10.8 Serial Violations Have Occurred. Check Interface Cable.
Figure 10-8 illustrates the error message displayed when acquiring an image or focusing the
detector and one (or both) of the following conditions exists:
• The detector system is not turned ON.
•
There is no communication between the detector and the host computer.
Figure 10-8: Serial Violations Have Occurred Dialog
Perform the following procedure to correct the problem:
1.
Turn OFF the detector system (if it is not already OFF).
2. Verify the computer interface cable is secured at both ends.
3.
After verifying the cable is connected, turn the detector system power ON.
4.
Click OK on the error message dialog and retry acquiring an image or running in focus
mode.
NOTE:
This error message will also be displayed if the detector system is
turned OFF or a cable comes loose while the application software
is running in Focus mode.
10.9 Vignetting
All arrays have been tested for uniformity and do not exhibit any vignetting (i.e., reduction
of response,) at the extreme ends of the array. If such a reduction in response across the
array is measured, it may be the result of one or more of the following conditions:
•
Condensation of water on the edges of the array window has occurred. This should
not happen unless the cooling/pumping instructions, previously mentioned, were
not followed or if the Dewar has developed a vacuum leak (a rare situation).
• The arrays are held with a special mask that has been designed to minimize
reflection and stray light. These masks have been designed to allow light rays to
enter through the Dewar window even at very wide angles (e.g., > f/1.5.) If
vignetting is observed, it is possible that your experiment exceeds these angular
constraints. Princeton Instruments measures the array response with a collimated
uniform light source to prevent such false bias results.
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