30 DECADE user manual, edition 9
respectively. These are the three DECADE integrator ranges that can be set
in the ‘Range select’ screen.
Fig. 5. The DECADE ‘Range select’ screen. The 10 nA/V corresponds to 100
nA full scale on the integrator output (=10V).
The integrator range selection is the first step in the signal pathway (Fig. 4). It
affects both the integrator and the recorder output and has several important
consequences for data acquisition (Table I).
Table I. Parameters affected by the integrator range setting.
parameter output
comment
signal output
INT/REC gain increases with more sensitive range
available REC ranges REC
see Table IV
max. compensation
REC/INT decreases with more sensitive range
I-cell display
screen
resolution increases with more sensitive
range
The next step is the auto zero and offset compensation. Then the signal is
further manipulated for the recorder output or sent to the integrator output
without manipulation.
Integrator output
The integrator output has been designed to supply a clean, purely analog
signal from the I/E converter. Except for the auto zero and offset
compensation, no further manipulation of the signal occurs. If required,
manipulation of a chromatogram (i.e. noise filtering) can be done by
integration software. Thus a clean chromatogram will always be available for
re-integration.
Table II. Integrator range and maximum zero compensation.
range
current, full scale
max. zero comp.
max. current
µA
10
µA
16
µA
26
µA
nA 100
nA
160
nA 260
nA
pA
10
nA
16
nA
26
nA
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