11 Configurationï€
Operation Manual 177
Analog Output Settings
When connecting the GC to an integrator or recorder, the device must be fast enough to
process data coming from the GC. If it cannot keep up with the GC, the data may be incorrect
or corrupted. This usually shows up as broadened peaks and loss of resolution.
Speed is measured in terms of bandwidth. The recorder or integrator should have a bandwidth
twice that of the signal being measured.
The GC can operate at two speeds. The faster speed allows minimum peak widths of 0.004
minutes (8 Hz bandwidth), while the standard speed allows minimum peak widths of 0.01
minutes (1.6 Hz bandwidth).
If using fast peaks feature, the integrator should operate at approximately 15 Hz.
Agilent does not recommend using Fast peaks with a TCD detector. Since the gas streams
switch at 5 Hz, the gain in peak width is offset by increased noise.
To change the analog output settings:
Figure 63. Analog output settings page
To use fast peaks for either analog output channel, select the corresponding Fast Peaks check
box.
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