Knauer Azura ECD 2.1, Instructions Manual

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41 Detection and Parameters
AZURA® Detector ECD 2.1 Instructions, V6685
Table III. PAD ranges and maximum compensation:
Range FS Max comp Range FS Max comp
200 µA 2.5 mA 500 nA 25 µA
100 µA 2.5 mA 200 nA 25 µA
50 µA 2.5 mA 100 nA 25 µA
20 µA 2.5 mA 50 nA 2.5 µA
10 µA 2.5 mA 20 nA 2.5 µA
5 µA 2.5 mA 10 nA 2.5 µA
2 µA 25 µA
1 µA 25 µA
Offset
A maximum offset of +50% and - 50% in 5% steps can be set. For exam-
ple, 20% is a 200 mV offset when the maximum output is 1.0 Volt.
Polarity
The polarity of the output can be inversed. Oxidative and reductive analy-
ses generate opposite currents. For data acquisition, traditionally chroma-
tographic peaks have a positive amplitude. Therefore selection of polarity
is useful.
Filter
High frequency noise is efficiently removed and chromatographic peaks
can be detected with better signal to noise ratio.
Fig. 25 Signal to noise ratio is improved using a filter (A vs. B).
The ECD 2.1 is equipped with ADF (Advanced Digital Filter) as a tool to
filter the acquired signal and improve the sensitivity of the analysis (Sig-
nal-to-noise ratio). In the next chapter the filter setting is explained inclu-
ding detailed background information about filtering.