Chapter 2 Front Panel Operations
RIGOL
DG800 User's Guide
2-57
Log Sweep
In Log Sweep type, the output frequency of the instrument varies in a logarithmic
fashion, that is, the output frequency changes in the way of "octave per second" or
"decade per second". The variation is controlled by "Start Frequency", "Stop
Frequency", and "Sweep Time".
When Log Sweep is enabled, you can set the following parameter: start frequency
start
F
, stop frequency
stop
F
, and sweep time
sweep
T
. The function prototype of Log
Sweep is:
T
current
F
P
=
current
F
is the instantaneous frequency of the current output. The parameter
P
and
T
can be expressed with the above parameter.
sweep
start
stop
T
F
F
P
/
)
/
lg(
10
=
)
lg(
/
)
lg(
P
F
t
T
start
+
=
Wherein,
t
is the time from the start of the sweep, and its range is from 0 to
sweep
T
.
Press Menu
Sweep
"Log" to enable the log sweep. An exponential function
curve is displayed on the screen, indicating that the output frequency changes in a
logarithmic mode.
Figure 2-9 Log Sweep
Step Sweep
In Step Sweep type, the output frequency of the instrument "steps" from "Start
Frequency" to "Stop Frequency" with a stepwise increase. The duration of the output
signal on each frequency point is determined by "Sweep Time" and "Steps".
Press Menu
Sweep
"Step" to enable the step sweep. A step waveform is
displayed on the screen, indicating that the output frequency varies with a stepwise
Summary of Contents for DG811
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