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The exposure meter has been fully calibrated and documented and is now fully integrated in the FIES operating software. The exposure meter is not yet available for the simultaneous-ThAr mode.
To protect the new FIES exposure meter a device has been designed to monitor the light level near the meter and when it exceeded a certain level (well within the limits of the photo-multiplier), it will cut the power and send a signal for the software to read, indicating what has happened.