5Methods
Operation Manual 103
This is used to correct baseline elevation or offsets. A common application is to correct a
baseline shift that occurs as the result of a valve operation. After zeroing, the analog output
signal is equal to the Value line of the parameter list minus the Zero setpoint.
Zero can be programmed as a run time event. For details, see “Events”.
Analog range
Range Scales data coming from the detector
Range is also referred to as gain, scaling, or sizing. It sizes the data coming from the detector
to the analog signal circuits to avoid overloading the circuits (clamping). Range scales all
analog signals.
If a chromatogram looks like A or B in the next figure, the data needs to be scaled (as in C) so
that all peaks are visible on the paper.
Valid setpoints are from 0 to 13 and represent 2
0
(=1) to 2
13
(=8192). Changing a setpoint by 1
changes the height of the chromatogram by a factor of 2. The following chromatograms
illustrate this. Use the smallest possible value to minimize integration error.
C: Range = 1B: Range = 3A: Range = 0
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