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Trouble Shooting: Beam too weak
When you are getting a very low reading on PDA-18, such
as less than 3 mA on a 1 (the switch on the right) x 4 (the SCALE) scale,
or you get a direct beam reading less
than 60,000, the beam is considered to be too weak. First try beam
alignment again. If that doesn't solve the problem, check
1. Collimator problem
2. Mirror problem
In some rare cases, you are getting high readings on PDA-18 but low on actuall
direct beam recorded on image plate.
This means that you might have a problem with the R-AXIS readout
system, particularly problem with the photomultiplier tube.
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