FeelTech
FY6600 Series User’s Manual 33
Sweep Type
FY6600 provides Linear, Logarithm sweep types. The default is Linear
sweep. The sweep type can be switched by pressing “MODE” button.
Linear Sweep
In linear sweep type, the signal parameter varies linearly. For example, in the
frequency sweep the output frequency of the instrument varies linearly in the way
of “Changing several Hertz per second”. The variation is controlled by “Start
Frequency”, “End Frequency” and “Sweep Time”.
The step value of linear sweep object is computed by the generator, the
formula is as follows:
Step value=（End value — Start value）/（Sweep time*100）
Logarithm Sweep
In linear sweep type, the signal parameter varies logarithmically.
For example, in the frequency sweep the output frequency changes in the way of
“octave per second” or “decade per second”. The variation is controlled by “Start
Frequency”, “End Frequency” and “Sweep Time”.
When Logarithm Sweep is enabled, users can set the following parameters:
Start Frequency (Fstart), Stop Frequency (Fend) and Sweep Time (Tsweep).
The function prototype of Logarithm Sweep:
F
current
=P
T
F
current
is the instantaneous frequency of the current output. P and T could be
expressed as shown below by the above-mentioned parameters:
P=10
lg(F
stop
/F
end
)/T
sweep
T=t+lg(F
start
)/lg(P)
Wherein, t is the time from the start of the sweep and its range is from 0 to
T
sweep.
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