5Methods
Operation Manual 105
Digital signal outputs respond to a zero command by subtracting the signal level at the time of
the command from all future values.
Signal Freeze and Resume
Available only from an Agilent data system.
Some run time operations, such as changing signal assignments or switching a valve, can
cause baseline upsets. Other factors can cause baseline upsets also. The GC can compensate
for this by pausing (freezing) the signal at a particular value, using that signal value for a
specified duration, and then resuming normal signal output.
Consider a system that uses a switching valve. When the valve switches, an anomaly occurs in
the baseline. By freezing and resuming the signal, the anomaly can be removed so that the
peak identification and integration software operates more smoothly.
Data rates with Agilent data systems
The GC can process data at various data rates, each corresponding to a minimum peak width.
The table shows the effect of data rate selection.
Baseline upset due to valve switch
Pause signal here
Resume signal here
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