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Signal Handling
Digital data handling
Attenuation may be run time programmed. See chapter 7 for details.
Data rates
Your integrator or recorder must be fast enough to process data coming from
the GC. If it cannot keep up with the GC, the data may be damaged. This usually
shows up as broadened peaks and loss of resolution.
Speed is measured in terms of bandwidth. Your recorder or integrator should
have a bandwidth twice that of the signal you are measuring.
The GC allows you to operate at two speeds. The faster speed—to be used only
with the FID, FPD, and NPD—allows minimum peak widths of 0.004 minutes
(8 Hz bandwidth), while the standard speed—which can be used with all
detectors— allows minimum peak widths of 0.01 minutes (1.6 Hz bandwidth).
If you use the fast peaks feature, your integrator should operate at around 15 Hz.
Procedure: Selecting fast peaks
Digital data handling
Digital zero
Digital signal outputs respond to the Zero command by subtracting the signal
level at the time of the command from all future values.
Baseline level shifts
Some run time operations, such as changing signal assignment or switching a
valve, can produce large changes in the signal baseline position. This can
complicate signal processing by external devices. The GC provides two run table
commands minimize such problems—see chapter 7 for information on using the
run table.
2. Press [ON] (FID only).
1. Press [Config][Signal 1] or [Config][Signal2].
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