Cheryl, TVO, Daniel 


The TCSX and TCSY CO2 laser verbal alarms were triggered even though they were off because the controller box was powered down causing the flowmeter readback to reach negative values. Both controller boxes were turned on and the flowrate reached nominal values but verbal alarms still persisted. To silence verbal alarms we raised the alarm condition of the CO2 laser powerhead PD from 5 watts to 10 watts. This cut out most of the alarms but the attached figure shows that the laser powerhead PD channels still glitch above the threshold.