RIGOL DG1000Z Series - Manual (Page 110)

RIGOL Chapter 2 Command System
2-98 DG1000Z Programming Guide
[:SOURce[]]:FREQuency:STARt
Syntax [:SOURce[]]:FREQuency:STARt {|MINimum|MAXimum}
[:SOURce[]]:FREQuency:STARt? [MINimum|MAXimum]
Description Set the start frequency of the sweep function of the specified channel.
Query the start frequency of the sweep function of the specified channel.
Parameter Name Type Range Default
[] Discrete 1|2 1
Real
The frequency range of the
current waveform of the
specified channel
100Hz
Explanation  The start frequency and stop frequency ( [:SOURce[]]:FREQuency:STOP ) is
the frequency upper limit and lower limit of the frequency sweep. The signal
generator always sweeps from the start frequency to the stop frequency and
then returns to the start frequency. When the start frequency is lower than the
stop frequency, the signal generator sweeps from low frequency to high
frequency; when the start frequency is greater than the stop frequency, the
signal generator sweeps from high frequency to low frequency; when the start
frequency is equal to the stop frequency, the signal generator outputs at the
fixed frequency.
 When [:SOURce[]] or [] is omitted, the system sets the related
parameters of CH1 by default.
 The sine, square, ramp and arbitrary waveform (except DC) can generate sweep
output and the range of the start frequency differs for different
sweep waveform.
 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 “Start 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 start frequency in scientific notation with 7 effective digits, for
example, 1.000000E+02 (the start frequency is 100Hz).
Example :SOUR1:FREQ:STAR 100 /*Set the start frequency of the sweep function of CH1
to 100Hz*/
:SOUR1:FREQ:STAR? /*Query the start frequency of the sweep function of
CH1 and the query returns 1.000000E+02*/
Related
Command
[:SOURce[]]:FREQuency:STOP