RIGOL DG1000Z Series - Manual (Page 109)

Chapter 2 Front Panel Operations RIGOL
DG1000Z User’s Guide 2-59
Sweep Type
DG1000Z provides Linear, Log and Step sweep types and the default is Linear
sweep.
Linear Sweep
In linear sweep type, the output frequency of the instrument varies linearly in the
way of “several Hertz per second”. The variation is controlled by “Start Frequency”,
“Stop Frequency” and “Sweep Time”.
When Sweep is enabled, press Type to select “Linear”. A straight line is displayed
on the waveform on the screen, indicating that the output frequency varies linearly.
Figure 2-7 Linear Sweep
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, users could set the following parameter:
Start Frequency (
start
F
), Stop Frequency (
stop
F
) and Sweep Time (
sweep
T
).
The function prototype of Log Sweep:
T
current
P F
=
current
F
is the instantaneous frequency of the current output.
P
and
T
could be
expressed as shown below by the above-mentioned parameters:
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
.
When Sweep is enabled, press Type to select “Log”. An exponential function curve
is displayed on the waveform on the screen, indicating that the output frequency
changes in a logarithmic mode.