User`s manual

:RANGe
[SOURce:]FREQuency[1]:RANGe <range> enables or disables frequency
doubling for non-sine wave outputs. When doubling is enabled, the waveform is
advanced on both edges, instead of one edge, of the square wave generated by the
direct digital synthesis chip, thus doubling the maximum sample output rate.
However, since the square wave symmetry is not perfect, doubling introduces some
systematic jitter in the sample rate. Also, in doubled mode, the frequency resolution
worsens by a factor of two.
Setting
<range> to any value less than or equal to the maximum undoubled
frequency, specified below, disables frequency doubling. Values greater than the
maximum undoubled frequency enable frequency doubling.
• Arbitrary Waveforms: The maximum undoubled frequency is the current
reference oscillator frequency divided by 4.
• Square Wave Outputs: The maximum undoubled frequency is the current
reference oscillator frequency divided by 16.
• Ramps and Triangle Outputs: The maximum undoubled frequency is the
current reference oscillator frequency divided by 4 further divided by the
[SOURce:]RAMP:POINts value.
Parameters
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
<
range>
numeric see below | MINimum | MAXimum Hz
MINimum selects 0 Hz; MAXimum selects twice the maximum undoubled frequency.
The above values bound the legal range for <
range>.
Comments • Since the maximum undoubled frequency depends on waveform shape and the
reference oscillator frequency, frequency doubling may be alternately enabled and
disabled as these settings change if
<range> is greater than 0. Setting
SOURce:FREQuency1:RANGe 0 is a good way to guarantee that frequency
doubling is always disabled.
• Executable when Initiated: Query form only
• Coupling Group: Frequency
• Related Commands: TRIGger[:STARt]:SOURce,
[SOURce:]FREQuency[1]:CENTer, MODE, STARt, and STOP,
[SOURce:]FUNCtion[:SHAPe], [SOURce:]ROSCillator commands
• *RST Condition: SOURce:FREQuency1:RANGe 0.0 Hz
[SOURce:]FREQuency[1]
326 Command Reference Chapter 8