120 Advanced User Guide
7 GC Output Signals
There are limits to usable range settings for some detectors. The
table lists the valid range setpoints by detector.
Range may be run time programmed. See “Run Time
Programming” on page 12 for details.
Analog 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
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 you use the fast peaks feature, your integrator should operate
at around 15 Hz.
C: Range = 1B: Range = 3A: Range = 0
Table 24 Range limits
Detector Usable range settings (2
x
)
FID 0 to 13
NPD 0 to 13
FPD 0 to 13
TCD 0 to 6
µECD 0 to 6
Analog input 0 to 7
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