The current detected by {HEAD ~ current detecting section} 22 is compared in a output comparison section 27 of controller unit 4 shown in FIG 2 with the normal current value of DC power supply section 20 that would have been detected at {TAIL ~ the same gas pressure} when the gas composition of laser gas 6 is normal 
The current detected by { HEAD ~ current detecting section } 22 is compared in a output comparison section 27 of controller unit 4 shown in FIG 2 with the normal current value of DC power supply section 20 that would have been detected at { TAIL ~ the same gas pressure } when the gas composition of laser gas 6 is normal
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH