Rigol DG800 Series, Руководство пользователя

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Chapter 2 Front Panel Operations RIGOL
DG800 User's Guide 2-59
Start Frequency and Stop Frequency
Start frequency and stop frequency are the upper and lower limits of the frequency
for frequency sweep. The generator always sweeps from the start frequency to the
stop frequency, and then returns back to the start frequency.

Start Frequency < Stop Frequency: the generator sweeps from low frequency to
high frequency.

Start Frequency > Stop Frequency: the generator sweeps from high frequency
to low frequency.

Start Frequency = Stop Frequency: the generator outputs with a fixed
frequency.
After the sweep function is enabled, tap the Start/Center menu label to enable the
display of "Start". Notice that the "Stop" in Stop/Span menu label will also be
highlighted at the same time. Input the desired frequency value by using the numeric
keypad, the arrow keys, or the knob. By default, the start frequency is 100 Hz, and
the stop frequency is 1 kHz. Different sweep waveforms correspond to different start
frequency and stop frequency ranges.
After modifying the "Start Freq" or "Stop Freq", the signal generator will restart to
output from the specified "Start Freq".
Center Frequency and Frequency Span
You can also set the frequency boundaries of frequency sweep through center
frequency and frequency span.

Center Frequency = (|Start Fre Stop Frequency|)/2

Frequency Span = Stop Frequency – Start Frequency
After the sweep function is enabled, tap the Start/Center menu label to enable the
display of "Center". At this time, the "Span" in Stop/Span menu label will also be
highlighted at the same time. Input the desired frequency value by using the numeric
keypad, the arrow keys, or the knob. By default, the center frequency is 550 Hz, and
the frequency span is 900 Hz. Different sweep waveforms correspond to different
center frequency and frequency span ranges. Besides, the center frequency and
frequency span are mutually affected.
Define the minimum frequency of the currently selected waveform
min
F
, the
maximum frequency as
max
F
and
2 / ) (
max min
F F F
m
+ =
.

The available range of the center frequency is from
min
F
to
max
F
. The
parameters of different waveforms are as follows:
Sine: 1 μHz to 35 MHz
Square: 1 μHz to 10 MHz