The output signal from this optical detector 7 is sent via the preamplifier to {HEAD ~ the RMS DC} 18, which converts {TAIL ~ the amplitude} into a dc voltage 
converts
The output signal from this optical detector 7 is sent via the preamplifier to { HEAD ~ the RMS DC } 18 , which converts { TAIL ~ the amplitude } into a dc voltage
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH