Rohde & Schwarz R&S SMW200A - Improving Level Performance

Configuring the RF Signal
R&S
®
SMW200A
562User Manual 1175.6632.02 ─ 30
8.8.5.2 How to Generate a Pulse Modulated Signal
The following example uses the internal pulse generator.
To set the frequency and level of the RF signal
1. Press [PRESET].
2. In the status bar, set "Frequency = 4 GHz".
3. Set "Level = -25 dBm".
To configure the pulse generator
1. Select "RF" > "Analog Modulation" > "Pulse Generator".
2. Select "Pulse Mode = Double".
3. Set "Pulse Period = 10 us".
4. Set "Pulse Width = 2 us".
5. Set "Double Pulse Width = 1.2 us".
6. Set "Double Pulse Delay = 4.5 us".
7. Activate "Pulse Output State".
8. Set "Trigger Mode = Auto".
In the "Pulse Graph" tab, you can view the generated pulse signal graphically.
To enable pulse modulation
1. Select the "Pulse Modulation" tab.
2. Set "State = I" to activate pulse modulation.
3. Set "RF > On" to enable signal output.
8.9 Improving Level Performance
To adjust the RF output signal to specific needs in your application optimally, the
R&S SMW provides different functions:
●
Attenuator
The R&S SMW is equipped with a step attenuator that enables you to vary the
amplitude of the RF signal in a wide range. It is characterized by low VSWR (volt-
age standing wave ratio) over the full level and frequency range, and provides
highest level accuracy and noise suppression.
See Chapter 8.9.1, "Attenuator", on page 563.
●
Automatic Level Control (ALC)
The automatic level control system ensures stable RF signals with highest absolute
level accuracy over temperature and time.
See Chapter 8.9.2, "ALC - Automatic Level Control", on page 566.
Improving Level Performance