Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 477)

<Appendix E Computation Scheme>
App.E-4
IM 11B08A01-01E
(1) Signal Level Processing
There are three kinds of processing: base level setting, level detection, and noise detection.
Base level setting Level detection Noise detection
Detector signal data
Base level value Signal level value Noise value
F020501.ai
Select any one of these.
 Base Level Setting
The signal level in the voltage at the specifi ed time in the analysis cycle (operation time) is stored
as the base level value.
 Level Detection
The difference between the latest base level and the signal level at the specifi ed time in the
analysis cycle (operation time) is detected as the signal level.
F02050102.ai
Base level setting
Base level value = E1 mV
E1 mV
E3 mV
0 mV
Peak height from the base level
Level detection
Level value = E2 mV
Base level setting
Base level value = E3 mV
 Noise Detection
The noise value of the signal at the specifi ed time in the analysis cycle is obtained.
The difference between the maximum and minimum values among 20 data is converted into a
value per second as the noise value.
F02050103.ai
n=20
Maximum and
minimum value
2nd Edition : May 11, 2012-00