Instrument Function > RF Block > RF Sweep Mode > RF Frequency Sweep > RF Frequency Sweep Settings
RF Frequency Sweep Settings
 

To access the sweep dialog, select "RF > configure > Sweep/List > RF Frequency Sweep".

 

In these dialogs you can configure the corresponding sweep signal.

State - Frequency Sweep

Activates RF sweep mode.

Note: Activating the RF sweep automatically deactivates other sweeps.

Remote command: 
 
Mode - RF Frequency Sweep

Selects the RF frequency sweep mode.

If you change the sweep mode during the execution, the signal generator stops the sweep and starts with the next trigger event at the initial value.

The "Reset Sweep" button sets the sweep to the start value.

"Auto"

Generates a continuously repeating sweep signal immediately after activating the sweep mode.

The sweep steps are performed atomatically, controlled by the dwell time, see "Dwell Time - Frequency Sweep".

Example: 

SOUR:SWE:FREQ:MODE AUTO

TRIG:FSW:SOUR AUTO

SOUR:FREQ:MODE SWE

"Single"

Generates a single sweep cycle after a trigger event.

The sweep steps within the cycle are performed automatically, controlled by the dwell time. If one cycle is completed, the instrument waits for the next trigger event.

To trigger the sweep, use "Execute Single Sweep" button, or the corresponding remote control commands, for example *TRG.

Example: 

SOUR:SWE:FREQ:MODE AUTO

TRIG:FSW:SOUR SING

SOUR:FREQ:MODE SWE

SOUR:SWE:FREQ:EXEC

"Step"

Generates the sweep signal step-by-step, manually triggered.

To perform the sweep steps, enter the frequency value under "Current Freq - Frequency Sweep". You can directly enter the value, but also use the UP and DOWN navigation keys or the ROTARY KNOB.

You can determine the step width below in the entry field "Step Lin" or "Step Log", see "Step Lin/Log - Frequency Sweep".

If a step is out of the sweep range ("Start Freq" or "Stop Freq"), it is ignored.

Note: To step through the sweep frequencies in remote control mode, use the FREQ:MAN command with the UP or DOWN parameter.

Example: 

SOUR:FREQ:CENT 300MHz

SOUR:FREQ:SPAN 400MHz

SOUR:SWE:FREQ:SPAC LIN

SOUR:SWE:FREQ:STEP:LIN 100MHz

SOUR:FREQ:MODE MAN

TRIG:FSW:SOUR SING

set sweep mode "Step".

SOUR:FREQ:MODE SWE

activate sweep mode, the frequency is set to "Start Freq".

SOUR:FREQ:MAN UP

set the frequency to the next higher sweep frequency.

SOUR:FREQ:MAN DOWN

set the frequency to the next lower sweep frequency.

"Extern Single"

Generates a single sweep cycle when an a external trigger event occurs.

The sweep steps within the cycle are performed automatically, controlled by the dwell time. If one cycle is completed, the instrument waits for the next trigger event.

To trigger the sweep, apply an external trigger signal.

Refer to the description of the rear panel for information on the connectors for external trigger signal input (see "Rear Panel Tour").

Example: 

SOUR:SWE:FREQ:MODE AUTO

TRIG:FSW:SOUR EXT

SOUR:FREQ:MODE SWE (External trigger)

"Extern Step"

Generates the sweep signal step-by-step, manually triggered.

To trigger a sweep step, apply an external trigger signal. The step width corresponds to the step width set for the rotary knob.

Example: 

SOUR:SWE:FREQ:MODE STEP

SOUR:SWE:FREQ:SPAC LIN

SOUR:SWE:FREQ:STEP:LIN 1MHz

TRIG:FSW:SOUR EXT

SOUR:FREQ:MODE SWE (External trigger)

"Extern Start/Stop"

Generates a continuously repeating sweep signal that is started, stopped and restarted by subseqeunt external trigger events. The sweep steps are performed automatically, controlled by the dwell time.

Refer to the description of the rear panel for information on the connectors for external trigger signal input (see "Rear Panel Tour").

Example: 

SOUR:SWE:FREQ:MODE AUTO

TRIG:FSW:SOUR EAUT

SOUR:FREQ:MODE SWE (External trigger)

Remote command: 
 
Execute Single Sweep - Frequency Sweep

Starts a sweep manually. This trigger button is displayed in "Single" mode.

Remote command: 
 
Reset Sweep - Frequency Sweep

Resets the sweep.

With the next trigger event, the sweep starts with at the initial value.

Remote command: 
 
Start Freq - Frequency Sweep

Sets the start frequency.

Remote command: 
 
Stop Freq - Frequency Sweep

Sets the stop frequency.

Remote command: 
 
Center Freq - Frequency Sweep

Sets the center frequency.

Remote command: 
 
Span - Frequency Sweep

Sets the span.

Remote command: 
 
Current Freq - Frequency Sweep

Displays the current frequency.

In sweep "Step" mode, the parameter is editable and you can enter frequency for the next step.

Remote command: 
 
Spacing - Frequency Sweep

Selects the mode for the calculation of the frequency sweep intervals.

"Linear"

Takes the frequency value entered as an absolute value in Hz.

"Logarithmic"

Takes the value entered as a lograithmic value, that means as a constant fraction of teh current frequency in %.

Remote command: 
 
Shape - RF Frequency Sweep

Selects the waveform shape of the sweep signal.

"Sawtooth"

One sweep runs from start to stop frequency. Each subsequent sweep starts at the start frequency, that means the shape of the sweep sequence resembles a sawtooth.

"Triangle"

The sweep runs from the start to the stop frequency and back, that means the shape of the sweep resembles a triangle. Each subsequent sweep starts at the start frequency.

Remote command: 
 
Retrace - RF Frequency Sweep

Activates that the signal changes to the start frequency value while it is waiting for the next trigger event.

You can enable this feature, when you are working with sawtooth shapes in sweep mode "Single" or "External Single", see "Mode - RF Frequency Sweep".

Remote command: 
 
Step Lin/Log - Frequency Sweep

Sets the step width for the individual frequency sweep steps.

At each step this value is added to the current frequency.

Depending on the "Spacing - Frequency Sweep" mode you have set, the corresponding parameter is displayed.

"Step Lin"

The step width is a constant value in Hz.

Remote command: 

 

"Step Log"

The step width is determined logarithmically in %, that means as a constant fraction of the current frequency.

Successive frequencies are calculated as follows:

  • start_f < stop_f
    f2 = f1 * (1 + step_log / 100)
    If f2 > stop_f: f2 is set to stop_f.
  • start_f > stop_f
    f2 = f1 / (1 + step_log / 100)
    If f2 < stop_f: f2 is set to stop_f.

When the shape "Triangle" is set, the frequency values on the slope from stop_f back to start_f are the same as on the slope from start_f to stop_f.

Remote command: 

 

Dwell Time - Frequency Sweep

Sets the dwell time. The dwell time determines the duration of the individual sweep steps.

The "Dwell Time" set by the user is used as the step time of the sweep. The effective net dwell time is shorter, reduced by the setting time. This setting time may be greater than the time specified in the data sheet.

Note:

It is recommended to switch off the display update for optimum sweep performance especially with short dwell times (see "Display Update").

Remote command: 
 
Ext. Trigger Input Slope

Sets the polarity of the active slope of an externally applied instrument trigger.

This setting affects the PULSE EXT/INST TRIG input (BNC connector at the rear of the instrument).

"Positive"

activates the rising edge of the trigger signal.

"Negative"

activates the falling edge of the trigger signal.

Remote command: 
 

 


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