Dionex RF-2000 - Page 34

Operating Instructions RF-2000
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5.2.7 Zero position adjustment for recorder
Adjust the zero position of recorder according to the following procedure before
starting measurement.
(1) Set the measuring range to a required value (refer to the previous item
"Setting recorder output range").
(2) Press zero to set the emission intensity to near 0.
(3) Move the baseline to a desired position using the pen position adjusting knob
of the recorder or pressing the ∆
∆∆
∆ zero shift ∇
∇∇
∇ key and start measurement.
The baseline returns to the position set in (3) thereafter by pressing zero.
Please note:
Range variable by pressing the ∆
∆∆
∆ zero shift ∇
∇∇
∇ key is as follows:
Approx + 100 ~ approx. - 20 (scale).
5.2.8 Setting response
In this equipment, a digital filter is used to improve S/N ratio.
Responsibility becomes better by setting the filter response fast but noise reduction
effect becomes less.
On the contrary, responsibility becomes worse by setting the response slow, but
noise reduction effect becomes large.
4 steps from 1 to 4 are available as the response for the digital filter by the setting of
parameter "RESPONSE". Responsibilities at each "RESPONSE" value compared to
conventional analog filter and equivalent time constants for analog filter are as shown
in the table below:
RESPONSE value Equivalent time constant
of analog CR filter
Minimum peak width
at half height (Note)
1 0.1s 0.2s or more
2 0.5s 1.1s or more
3 1.5s 3.6s or more
4 3.0s 6.6s or more
Setting procedure for RESPONSE:
1) Press shift + rsp. The following is displayed and RESPONSE can be
changed.
EX(nm) EM(nm) Data
RESPONSE <<3>>
2) Enter the desired value with numerical key and press Enter.
3) Press CE to return to the initial state of display.
Please note:
If response is set slower, responsibility becomes poorer and
peak height becomes lower, and peaks with less width of half-
height show more deterioration of the peak height. Here, the
figures of minimum peak width of half-height indicate for
reference that the peak height becomes 10% lower at each
response setting value. Even when responsibility becomes
poorer and the peak is broadened, the peak area is not
changed.