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Troubleshooting: Data Comes Slowly
This is most likely to be a problem with the electronics setup,
cabling or failure. Note that, if data is missing from one or more
readout boards, the synchronization box will eventually generate a
time out and allow the next trigger. Common problems include:
- Slow trigger rate:
Verify that raw triggers come at a reasonable rate from the
trigger source - the
pedestal and pulser runs.
- Wrong Rosie-busy configuration: Verify that the
setup is correct, with Rosie busies enabled (switch up) if, and
only if, the Rosie was enabled at configuration time.
- No data from an RDO: Check the MiniDAQ
i960 windows for error messages
that indicate Rosie errors due to link problems or missing/corrupt data;
also, check the Rosie LED's.
- Link problems:
FEE power supplies
must be on and properly connected for all enabled readout boards.
must be undamaged and properly connected; diagnose by swapping fibers or
checking the laser power output from the suspect fiber with a meter.
lasers sometimes fail to couple enough power to the optical fiber
for a proper connection due to RDO voltage regulation, laser failure
or laser mis-alignment; this usually requires a repair by Fred Bieser.
A Rosie failure can cause a link problem, but this is rare.
- No trigger to an RDO: RDO's have a green LED that
flashes visibly for each trigger; if it doesn't, check the
trigger cable connections.
- No RDO data following a trigger:
If an RDO repeated fails to transmit an event after being triggered,
the readout board usually requires repair, but occasional misses
(a few times per day, or less) are usually impractical to debug.
- Corrupt data:
If an RDO repeatedly supplies corrupt/wrong-length data buffers
or headers - the RDO, the link or the Rosie requires repair.
Roy Bossingham, LBNL