Quick Start
R&S
®
ESRP
91
User Manual 1175.7445.02 ─ 08
Low Reference Levels
If the selected reference level is lower than the highest signal that occurs in the spec-
trum, the signal path in the R&S
ESRP 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 maxi-
mum of the measurement diagram. However, the increase in the displayed noise is
not substantial. Thus, the distance between the signal maximum and the noise dis-
play (=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 located.
Thus, setting the reference level is reduced to two keystrokes.
3.5.1.2
Measuring the Signal Frequency Using the Frequency Counter
The built-in frequency counter allows you to measure the frequency more accurately
than measuring it with the marker. The frequency sweep is stopped at the marker, and
the R&S
ESRP measures the frequency of the signal at the marker position.
In the following example, the frequency of the generator at 128 MHz is shown by using
the marker.
Prerequisite
In this example, a precise frequency measurement is to be performed. Therefore, con-
nect the signal generator's "Ref OUT" connector to the analyzer's "Ref IN" connector.
1. Set the signal analyzer to the default state by pressing the [PRESET] key.
Basic Measurement Examples
