Rigol DG800 Series - Page 86

RIGOL Chapter 2 Command System
2-72 DG800 Programming Guide
Remarks
 Start frequency and stop frequency (
[:SOURce[<n>]]:FREQuency:STOP) 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. When the start frequency is smaller
than the stop frequency, the signal generator sweeps from the 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[<n>]] or [<n>] is omitted, the system sets the related parameters of CH1 by default.
 The Sine, Square, Ramp, and Arbitrary waveform (except DC) can generate the sweep output. The
range of the start frequency <frequency> differs for different sweep waveforms.
 The start frequency, stop frequency, center frequency and frequency span fulfills the following
equations.
|)(|
stopstartcenter
FFF +=
;
|)(|
startstopspan
FFF −=
Wherein,
center
F
——center frequency;
span
F
——frequency span;
start
F
——start frequency;
stop
F
——stop frequency.
 The generator will restart to sweep and output from the specified "Start Frequency" after the "start
frequency" is modified. 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 100 Hz).
Example
:SOUR1:FREQ:STAR 100 /*Sets the start frequency of the sweep function of CH1 to 100 Hz.*/
:SOUR1:FREQ:STAR? /*Queries the start frequency of the sweep function of CH1 and the query
returns 1.000000E+02.*/
[:SOURce[<n>]]:FREQuency:STOP
Syntax
[:SOURce[<n>]]:FREQuency:STOP {<frequency>|MINimum|MAXimum}
[:SOURce[<n>]]:FREQuency:STOP? [MINimum|MAXimum]
Description
Sets the stop frequency of the sweep function of the specified channel.
Queries the stop frequency of the sweep function of the specified channel.
Parameter
Name
Type
Range
Default
[<n>]
Discrete
1|2
1
<frequency> Real
Frequency range of the current
waveform of the specified channel
1 kHz
Remarks
 Start frequency (
[:SOURce[<n>]]:FREQuency:STARt) 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. When the start frequency is smaller
than the stop frequency, the signal generator sweeps from the low frequency to high frequency; when
the start frequency is greater than the stop frequency, the signal generator sweeps from high