MAINTENANCE AND TROUBLESHOOTING
PerkinElmer Life and Analytical Sciences 167
IPA Errors
Troubleshooting IPA Parameters
These problems occur when the IPA parameters are outside of the specified
limits.
High Carbon-14 Background
1. Check for contaminated detector by counting an empty vial and displaying the
spectrum via the SpectraView window. If the detector is contaminated, call
PerkinElmer Technical Service.
2. Check for increased environmental radiation; determine if high energy sources
are stored near the instrument.
3. Check for electrostatic discharge; use static controller.
4. If gamma sources are used in the lab, perform a wipe test to check for gamma
nuclide contamination on the vial.
5. Check for electronic noise; use a separate power line for the instrument or call
PerkinElmer Technical Service.
High Chi-Square
Problem with high voltage power supply or the photomultiplier tubes. Call
PerkinElmer Technical Service.
Note: A properly performing instrument may exceed the 7.63 to
36.19% limit 2% of the time. This is a result of the statistical
nature of the Chi-Square test.
High Tritium Background
1. Check for contaminated detector by counting an empty vial and displaying the
spectrum in the SpectraView window. If the detector is contaminated, call
PerkinElmer Technical Service.
2. Check for increased environmental radiation; determine if high energy sources
are stored near the instrument.
3. Check for electrostatic discharge; use the static controller.
4. If gamma sources are used in the lab, perform a wipe test check for gamma
nuclide contamination on the vial.
5. Check for electronic noise; use a separate power line for the instrument or call
PerkinElmer Technical Service.
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