Instrument Function > Modulation Generator and LF Output > Pulse Generator > Pulse Generator Settings
Pulse Generator Settings

To access the pulse generator settings ...

 

Select "Mod Gen > config... > Pulse Generator" or use the MENU key under "Mod Gen".

Alternatively, the R&S SMA provides the pulse generator parameters in the "Pulse Modulation" dialog accessed via the "Modulation" block.

 

The dialog provides the settings for the pulse characteristics and trigger mode. Depending on the selected modulation source and pulse mode the provided parameters vary.

Note: Extended features as the generation of double pulse signals with selectable pulse widths and periods, or selectable trigger mode require option R&S SMA-K23.

Video Sync Signal State - Pulse Generator

Switches on/off the output of the video/sync signal at the PULSE VIDEO connector. The signal output and the pulse generator are automatically switched on with activation of pulse modulation if pulse generator is selected as modulation source. The signal output can be switched off subsequently.

Remote command: 
 
Pulse Mode - Pulse Generator

Sets the mode of the pulse generator.

"Single"

A single pulse is generated in one pulse period.

"Double"

Two pulses are generated in one pulse period. Additional settings for the double pulse are available in the menu.

"Train"

Requires option R&S SMA-K27.

A user-defined pulse train is generated. Additional settings for the pulse train are available in the menu after selection of the pulse train mode (see "Pulse Train Generation").

A pulse train is a sequence of pulses with user-defined on and off times. The on-time/off-time value pairs are defined in a pulse train list. The currently used pulse train file is displayed in the sub menu.

Remote command: 
 
Pulse Period - Pulse Generator

Sets the period of the generated pulse. The period determines the repetition frequency of the internal signal.

Remote command: 
 
Pulse Width - Pulse Generator

Sets the width of the generated pulse. The width determines the pulse length. The pulse width must be at least 20 ns less than the set pulse period.

Remote command: 
 
Pulse Delay - Pulse Generator

(External trigger only)

Sets the pulse delay. The pulse delay determines the time that elapses after a trigger event before pulse modulation starts. The pulse delay is not effective for double pulse generation.

Remote command: 
 
Double Pulse Width - Pulse Generator

(Double Pulse only)

Sets the width of the second pulse.

Remote command: 
 
Double Pulse Delay - Pulse Generator

(Double Pulse only)

Sets the delay from the start of the first pulse to the start of the second pulse.

Remote command: 
 
Trigger Mode - Pulse Generator

Selects the trigger mode for pulse modulation.

Note: An external trigger signal is supplied via the PULSE EXT connector.

"Auto"

The pulse generator signal is generated continuously.

"Ext Triggered"

The pulse generator signal is triggered by an external trigger event.

Example: Generation of pulse signals using trigger modes Ext Triggered (Single Pulse)

The measurement is performed using a 6-dB-attenuator.

Parameter

Value

Trigger Mode

Ext Triggered

Double Pulse State

Off

External Trigger Input Slope

Positive

Pulse Delay

100 ns

Pulse Width

100 ns

Pulse Period

-

Channel 1 = Indicates the external trigger signal. The positive slope is active.
Channel 2 = Indicates the sync signal. The sync signal starts after a trigger delay of typically 50 ns (see specifications).
Channel 3 = Indicates the pulse signal. The pulse signal starts after the set pulse delay of 100 ns.

Note: The sync signal is output at the PULSE SYNC connector, and the pulse signal at the PULSE VIDEO connector.

Example: Generation of pulse signals using trigger modes Ext Triggered (Double Pulse)

The measurement were made using a 6-dB-attenuator.

Parameter

Value

Trigger Mode

Ext Triggered

Double Pulse State

On

External Trigger Input Slope

Negative

Pulse Width

100 ns

Double Pulse Width

100 ns

Double Pulse Delay

200 ns

Pulse Period, Pulse Delay

-

Channel 1 = Indicates the external trigger signal. The negative slope is active. A second trigger signal during double pulse generation is without effect.
Channel 2 = Indicates the sync signal. The sync signal starts after a trigger delay of typically 50 ns (see specifications).
Channel 3 = Indicates the double pulse signal. The first pulse starts without a delay. The second pulse starts after the set double pulse delay (time between start of first pulse to start of second pulse).

Note: The sync signal is output at the PULSE SYNC connector, and the double pulse signal at the PULSE VIDEO connector.

"Ext Gated"

The pulse generator signal is gated by an external gate signal.

Example: Generation of pulse signals using trigger mode External Gated (Single Pulse)

The measurement is performed using a 6-dB-attenuator.

Parameter

Value

Trigger Mode

Extern Gated

Double Pulse State

Off

External Trigger Input Slope

Positive

Pulse Delay

100 ns

Pulse Width

100 ns

Pulse Period

300 ns

Channel 1 = Indicates the external gate signal. The signal is active when it is high (positive).
Channel 2 = Indicates the sync signal. The sync signal starts after a trigger delay of typically 50 ns (see specifications). It is repeated after the set pulse period of 300 ns as long as the gate signal is active.
Channel 3 = Indicates the pulse signal. The first pulse starts after the pulse delay of 100 ns. The second pulse starts after the set pulse period.

Note: The sync signal is output at the PULSE SYNC connector, and the pulse signal at the PULSE VIDEO connector.

Remote command: 
 
External Trigger Input Slope - Pulse Generator

(External Trigger only)

Sets the polarity of the active slope of an applied trigger signal.

"Positive"

The pulse generator is triggered on the positive slope of the external trigger signal.

"Negative"

The pulse generator is triggered on the negative slope of the external trigger signal.

Remote command: 
 
Gate Input Polarity - Pulse Generator

(Trigger Mode External Gated only)

Selects the polarity of the Gate signal.

The signal is supplied via the PULSE EXT connector.

"Normal"

The pulse signal is generated while the gate signal is high.

"Inverse"

The pulse signal is generated while the gate signal is low.

Remote command: 
 
External Impedance

Selects the input impedance (10 kOhm or 50 Ohm) for the external trigger and gate signal input (PULSE EXT).

Remote command: 
 

 


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