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Sweep
•
Center Frequency = (Start Frequency + Stop Frequency)/2
•
Frequency Span = Stop Frequency - Start Frequency
After enabling the sweep mode, click or tap the Start/Center button to set the
parameter to "Center". "Center" is now highlighted. This operation also toggles the
parameter of the Stop/Span button to "Span". Click or tap the corresponding input
field and use the pop-up numeric keypad to set the center frequency or frequency
span. By default, the center frequency is 550 Hz and the frequency span is 900 Hz. The
ranges of center frequency and frequency span vary for different waveforms. Also,
they are limited to each other.
The range of frequency span is affected by the center frequency. Define the upper
limit of the start/stop frequency as
frequency as
F
)/2.
min
•
When Center Frequency ≤
F
min
•
When Center Frequency >
Frequency).
Take sine wave as an example.
the center frequency is 50 MHz, the frequency span range is ±2 x (50 MHz - 1 μHz) =
±100 MHz; if the center frequency is 120 MHz, the frequency span range is ±2 x (200
MHz - 120 MHz) = ±160 MHz.
TIP
To sweep up in frequency, set a positive frequency span; to sweep down, set a negative
frequency span.
7.4
Sweep Time
Sweep time specifies the time required to sweep from the start frequency to the stop
frequency.
Click or tap the Sweep input field and use the pop-up numeric keypad to set the
sweep time. The default sweep time is 1 s and the resolution is 1 ms. The sweep time
ranges from 1 ms to 250,000 s. The sweep time is related to the sweep type, trigger
source, start hold time, return time, and stop hold time.
Time + Return Time + Stop Hold Time:
•
Linear Sweep:
-
-
DG900 Pro User Guide
64
F
Table 5.1 Range of Continuous Waveform Frequency
(
min
F
).
F
F
min
T
Internal trigger:
+ 1 ms ≤ 8,000 s
P
Manual trigger/external trigger:
F
and the lower limit of the start/stop
max
, the Frequency Span is ±2 x (Center Frequency -
m
, the Frequency Span is ±2 x (
m
F
is 1 μHz,
is 200 MHz, and
max
T
T
≤ 250,000 s
P
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
F
F
).
= (
m
max
F
- Center
max
F
is 100 MHz. If
m
= Sweep Time + Start Hold
P
-
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