RIGOL DG1000Z Series - Manual (Page 109)

Chapter 2 Command System RIGOL
DG1000Z Programming Guide 2-97
[:SOURce[<n>]]:FREQuency:SPAN
Syntax [:SOURce[<n>]]:FREQuency:SPAN {<frequency>|MINimum|MAXimum}
[:SOURce[<n>]]:FREQuency:SPAN? [MINimum|MAXimum]
Description Set the frequency span of the sweep function of the specified channel.
Query the frequency span of the sweep function of the specified channel.
Parameter Name Type Range Default
[<n>] Discrete 1|2 1
<frequency> Real
The frequency range of the
current waveform of the
specified channel
900Hz
Explanation  You can set the sweep boundaries via the center frequency and frequency
span ( [:SOURce[<n>]]:FREQuency:SPAN ). The ranges of the center
frequency and frequency span of different sweep waveforms are different and
the center frequency and frequency span affect each other. Define the
minimum frequency of the current waveform as
min
F
, the maximum frequency
as
max
F
,
2 / ) (
max min
F F F
m
+ = . The range of the center frequency (defined as
center
F
) is
min
F
to
max
F
. The range of the frequency span (defined as
span
F
)
is affected by the center frequency. When the center frequency is lower than
m
F
, the range of the frequency span is
) ( 2
min
F F
center
− × ± ; when the center
frequency is greater than
m
F
, the range of the frequency span is
) ( 2
max center
F F
− × ± .
 When [:SOURce[<n>]] or [<n>] is omitted, the system sets the related
parameters of CH1 by default.
 The start frequency, stop frequency, center frequency and frequency span
fulfills the following relation.
|) (|
stop start center
F F F
+ = ;
|) (|
start stop span
F F F
− =
Wherein,
center
F
——center frequency;
span
F
—— frequency span;
start
F
—— start frequency;
stop
F
—— stop frequency.
 After the “Frequency Span” is modified, the signal generator will output the
sweep waveform from the specified “Start Frequency”. In large-scale sweep,
the amplitude characteristic of the output signal might change.
Return Format The query returns the frequency span in scientific notation with 7 effective digits,
for example, 8.000000E+02 (the frequency span is 800Hz).
Example :SOUR1:FREQ:SPAN 800 /*Set the frequency span of the sweep function of
CH1 to 800Hz*/
:SOUR1:FREQ:SPAN? /*Query the frequency span of the sweep function of
CH1 and the query returns 8.000000E+02*/
Related
Command
[:SOURce[<n>]]:FREQuency:CENTer