Monitoring tool for digital errors in the ATLAS tile calorimeter readout

A software monitoring tool for easy visualization of digital errors that occur during data taking in the Tile calorimeter of the ATLAS experiment has been developed. This system is useful to keep track of the performance over time. It can also correlate the digital errors with other problems, such as with power supplies, and for diagnostic purposes. The ATLAS archive database is used to correlate the current digital error rates with the detector and data acquisition status. The results are stored locally so that users can monitor the evolution of error rates and localize problems. The system provides a flexible easy-to-use interface that can be accessed using a web browser.