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Section 4. Operating the Electrochemical Detector
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FILTER
This control adjusts the cutoff frequency of the active 4-pole Bessel filter. Filter settings be-
tween 0.02 and 1.0 Hz (in 14 steps) may be selected by pressing the [+] and [–] keys. The
filter setting selected is shown on the display. A filter value of 0.1 Hz is a good general-pur-
pose setting. The optimum filter setting depends on peak width. A filter setting of 0.02 Hz
provides the greatest amount of filtering, and 1.0 Hz provides the least amount.
If you wish to optimize the filter setting for your separation, try several runs with different fil-
ter settings. Both peak height and noise will increase as filter frequency increases, and de-
crease as filter frequency decreases. Choose the range that gives the highest signal-to-noise
ratio (peak height divided by baseline noise).
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