Agilent Technologies 1100 Series - Page 118

120 1100 Series FD Reference Manual
4 Troubleshooting and Test Functions
Formula for the Raman ASTM S/N value (see Figure 48 for details):
The result should be > 200 with FLF board revision A.
The result should be > 400 with FLF board revision B and above.
Figure 48 Raman ASTM signal/noise calculation
RamanASTM
Height RamanCurrent()Height DarkCurrent()
ñ
ASTMNoise
-------------------------------------------------------------------------------------------------------------------------------
=
Height Raman
Current
average between
5 and 10 minutes
Height Dark Current
average between
21 and 22 minutes
ASTMNoise (time 5 to 20 minutes)