11.3 Selecting measurement parameters
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11.3 Selecting measurement parameters
Measurement parameters are basically set in the same way as for
Time Domain (Scope) High Resolution Scope mode (see Selecting
measurement parameters on page 184). The following settings are crucial
here:
1. Press the Fcent softkey to set the center frequency (see Setting the
center frequency (Fcent) on page 91).
2. Press the BW softkey to set the channel bandwidth (see Setting the
bandwidth (RBW / CBW) on page 94).
3. Time Span is always automatically set to the maximum possible value
when the bandwidth is changed. Redfuce the value if necessary (see
Selecting Time Span on page 205).
4. Press the Reference Level softkey to set the reference level for correct
modulation (see Setting the reference level (Reference Level)
on page 97).
5. Make settings in the Trigger menu in order to start event controlled
capture. Otherwise the measurement will be in Free Run mode (see
Using the trigger function on page 192).
11.3.1 Setting the channel bandwidth (CBW)
You must choose a channel bandwidth that allows the entire signal to be
captured. The maximum possible time resolution (1/CBW) results from the
bandwidth setting.
The fast Fourier transformation (FFT) requires the selection of a higher
channel bandwidth for computing the spectrum.
Fspan = 0.8 x CBW (maximum value approx. 22 MHz)
See Setting the bandwidth (RBW / CBW) on page 94.
11.3.2 Selecting Time Span
1. Press the Time Span softkey.
Entry is in seconds by default.
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