Rohde & Schwarz R&S FPH, Руководство пользователя

Страница: 170 / 484

Spectrum Analyzer Mode
R&S ® Spectrum Rider FPH
165 User Manual 1321.1011.02 ─ 06.00
Time domain measurements
You can also activate time domain measurements without having to enter the value
manually. When measuring in the time domain, the span is 0 Hz. In that state, the R&S
Spectrum Rider measures the signal at the current center frequency only. Instead of
displaying the spectrum, the R&S Spectrum Rider shows the signal power over a cer-
tain time period. The horizontal axis becomes the time axis. The display always starts
at 0 s and stops after the currently set sweep time.
1. Press the [SPAN] key.
2. Select the "Zero Span" softkey.
The R&S Spectrum Rider sets a span of 0 Hz and performs the measurement in
the time domain.
6.2.3 Configuring the Vertical Axis
All relevant settings to configure the vertical axis are available in the amplitude menu.
You can access it via the [AMPT] key.
● Setting the Reference Level ..................................................................................165
● Setting a Display Range ........................................................................................166
● Selecting the Display Unit ..................................................................................... 166
● Setting a Reference Offset ....................................................................................167
● Setting the RF Attenuation ....................................................................................167
● Using the Preamplifier (R&S FPH-B22) ................................................................ 169
● Setting the Input Impedance ................................................................................. 169
● Using Transducer Factors .....................................................................................169
6.2.3.1 Setting the Reference Level
The reference level is represented graphically by the grid line at the top of the diagram.
The reference level sets the input signal gain up to the display stage. If the reference
level is low, the gain is high. That means that even weak signals are displayed clearly.
If you are measuring strong signals, you have to set a high reference level in order to
prevent an overload of the signal path of the analyzer and to keep the signal within the
display range. If you are measuring the spectrum of a composite signal, make sure that
the reference level is high enough to cover all signals and that all signals are within the
measurement diagram.
1. Press the [AMPT] key.
2. Select the "Ref Level" softkey.
The R&S Spectrum Rider opens an input field to define the reference level.
3. Enter the reference level you require.
If you change the reference level, the R&S Spectrum Rider adjusts the position of
the trace as you make the changes.
Configuring Spectrum Measurements