Sample Rate; Thresholds - Ecom ECD2800 User Manual

Example: narrowest expected peak half width in analysis is 8 s and therefore recommended time constant
For standard chromatographic analysis is usually suitable default value of time constant 1 s.
But it is necessary to reset it for UHPLC applications, where is commonly suggested value 0.05 s.

6.1.3. Sample Rate

This setting determines, how many times per second will be measured signal. Its value is
selected according to speed of running analysis.
Sampling
Rate
[sps]
1
2
5
10 default
20
50
100
for 20 points per peak; coefficient 1.7 was used for conversion of width and half width
Example.: narrowest expected peak half width in analysis is 11 s and therefore minimal recommended
For standard chromatographic analysis is usually suitable default value of sampling rate
10 sps (samples per second). But it is necessary to reset it for UHPLC applications.
Setting high sampling rate results in large data files. Contrariwise too low sampling rate
destroys peak shape and puts inexact its area and height. Recommended setting ensures at least
20-40 data points (samples) per narrowest peak.

6.1.4. Thresholds

Detector enables to do certain actions based on absorbance signal and setting of threshold
values. It is possible to set two values, THRESHOLD A and THRESHOLD B in the range
1 up to 4 AU.
Actions performed based on set threshold values can be set for external interface
in Menu/IO config/Interface.
Time Constant
[s]
0,2
0.5
1 default
2
5
10
R
ECOMMENDED MINIMAL SAMPLING RATES
Peak width for narrowest
expected peak in analysis
[s]
20
10
4
2
1
0.4
0.2
sampling rate is 2 sps (samples per second)
Peak half width for narrowest
expected peek in analysis
[s]
0,9
2.2
5
10
24
45
is 1 s
Peak half width for narrowest
expected peak in analysis
[s]
12
6
2.4
1.2
0.6
0.2
0.1
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ECD2800 / ECD2600