Basic Measurement Examples
R&S
®
FSVA/FSV
115
Quick Start Guide 1321.3066.02 ─ 05
Low Reference Levels
If the selected reference level is lower than the highest signal that occurs in
the spectrum, the signal path in the R&S
FSVA/FSV is overloaded.
In this case, the message "IFOVL" is displayed in the error message field.
In the presettings, the value of the reference level is -10 dBm. If the input signal is
-30
dBm, the reference level can be reduced by 20 dB without causing the signal
path to be overloaded.
Reducing the reference level by 20 dB
1. Press the AMPT key.
The amplitude menu is displayed. The "Ref Level" softkey is highlighted in red
to indicate that it is activated for data entry. The dialog box for the reference
level is also opened.
2. Using the numeric keypad, enter
30
and confirm the entry with the - DBM key.
The reference level is set to -30 dBm. The maximum of the trace is near the
maximum of the measurement diagram. However, the increase in the dis-
played noise is not substantial. Thus, the distance between the signal maxi-
mum and the noise display (=dynamic range) has increased.
Setting the marker level equal to the reference level
The marker can also be used to shift the maximum value of the trace directly to
the top edge of the diagram. If the marker is located at the maximum level of the
trace (as in this example), the reference level can be moved to the marker level
as follows:
1. Press the MKR key.
2. Press the "Ref Lvl = Mkr Lvl" softkey.
The reference level is set equal to the measured level where the marker is loca-
ted.
Thus, setting the reference level is reduced to two keystrokes.
Measuring a Sinusoidal Signal
Содержание R&S FSV
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