Campbell-scientific EC150 CO2 and H2O Open-Path Gas Analyzer and EC100 Manuale Utente Scaricare il pdf (Pagina 61)

Appendix B. Filter Bandwidth and Time

Delay

The EC100 measures CO

and H

O from the EC150 gas analyzer head. It will

also measure wind velocity and sonic temperature if the optional CSAT3A

sonic head is being used. EC100 measurements occur at 100z and then a user-

selectable, low-pass filter is applied. The available filter bandwidths are 5, 10,

12.5, 20, and 25 Hz.

FIGURE B-1 shows the amplitude response of these filters. The EC100 filters

provide a flat pass band, a steep transition from pass band to stop band, and a

well-attenuated stop band. FIGURE B-2 compares the EC100 10-Hz filter to a

50-ms moving average filter with approximately the same bandwidth.

FIGURE B-1. Amplitude response of EC100 filter at various bandwidths

B-1

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 85 86

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Campbell-scientific EC150 CO2 and H2O Open-Path Gas Analyzer and EC100 Manuale Utente Pagina 61