Rohde & Schwarz FSQ series, Quick Start Manual

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Quick Start Guide 1313.9652.62 - 02 5.3
R&S FSQ Basic Measurement Examples
Measuring a Sinusoidal Signal
5.1 Measuring a Sinusoidal Signal
One of the most common measurement tasks is determining the level and frequency of a
signal. When measuring an unknown signal, you can usually start with the preset setting.
In the following examples, a signal generator is used as a signal source.
Test setup:
Connect the RF output of the signal generator to the RF input of R&S FSQ.
Settings on the signal generator:
5.1.1 Measuring the Level and Frequency with Markers
The level and frequency of a sinusoidal signal can be measured easily by using the marker
function. The R&S FSQ always displays its amplitude and frequency at the marker position.
The frequency measurement uncertainty is determined by the reference frequency of the
R&S FSQ, the resolution of the marker frequency display and the resolution of the screen.
5.1.1.1 Procedure
1. Reset the instrument.
➢
Press the PRESET key.
2. Connect the signal to be measured to the RF INPUT input on the instrument front
panel.
3. Set the center frequency to 128 MHz.
➢
Press the FREQ key.
The entry field for the center frequency appears on screen.
➢
Using the numeric keypad in the input field, enter 128 and confirm the entry with the MHz
key.
If levels higher than +30 dBm (=1 W) are expected or are possible, a
power attenuator must be inserted before the RF input of the R&S FSQ.
If this is not done, signal levels exceeding 30 dBm can damage the RF
attenuator or the input mixer. The total power of all signals that are
present must be taken into account.
Frequency: 128 MHz
Level: -30 dBm