RIGOL DG1000Z Series - Manual (Page 103)

Chapter 2 Command System RIGOL
DG1000Z Programming Guide 2-91
:SOURce:FREQuency Commands
[:SOURce[<n>]]:FREQuency:CENTer
Syntax [:SOURce[<n>]]:FREQuency:CENTer {<frequency>|MINimum|MAXimum}
[:SOURce[<n>]]:FREQuency:CENTer? [MINimum|MAXimum]
Description Set the center frequency of the sweep function of the specified channel.
Query the center frequency of the sweep function of the specified channel.
Parameter Name Type Range Default
[<n>] Discrete 1|2 1
<frequency> Real Refer to the “Explanation” 550Hz
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 “Center Frequency” 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 center frequency in scientific notation with 7 effective digits, for
example, 5.000000E+02 (the center frequency is 500Hz).
Example :SOUR1:FREQ:CENT 500 /*Set the center frequency of the sweep function of CH1
to 500Hz*/
:SOUR1:FREQ:CENT? /*Query the center frequency of the sweep function of
CH1 and the query returns 5.000000E+02*/
Related
Command
[:SOURce[<n>]]:FREQuency:SPAN