18 Chinese Metrology Testing
272 Operation Manual
[[Using the Conversion Factors]
[[To use the conversion factors, multiply the ASTM noise reported from the Agilent data
system for the GC digital signal path by the appropriate conversion factor. ]
[For example, consider applying the FPD+[] and ECD conversion factors to a statistical
sampling of digital noise performances measured for both detectors at Agilent:]
[Average FPD+[] ASTM noise, DU
12
: 1.54]
[Average ECD ASTM noise, DU
3
: 0.16]
[Applying the conversion factors: ]
[FPD+[]: 1.54 DU × (1 × 10[
–12
] A/1 DU) = 1.54 × 10[
–12
] A]
[ECD: 0.16 DU × (0.2 mV/1 DU) = 0.032 mV]]]
1 Agilent data for FPD+ noise in this example represents sulfur mode only.
2 Data collected for purposes of comparison should be acquired with a nominal FPD+ offset of
< 100 DU in sulfur mode and < 20 DU in phosphorus mode and at a data rate of 5 Hz.
3 Data collected for purposes of comparison should be acquired with a nominal ECD baseline at or
below 150 DU and at a data rate of 5 Hz.
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