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· [OBW Off On]: Press [Measure]→ [OBW]→ [OBW Off On] to enable or
disable the occupied bandwidth measurement function.
· [Method]: Press [Measure]→ [OBW]→ [Method % dBc] to select the
appropriate test method, including percentage and drop dBc. In the
percentage method, the occupied bandwidth of the signal is obtained by
calculating the bandwidth of the frequency of certain percentage to the
total power of the transmitted power, and the power percentage can be set
by the user. In the drop dBc method, the occupied bandwidth is defined as
follows: spacing between two frequency points corresponding to signal
power drop by dBc on both sides of the frequency point where the signal
peak power is. The signal power drop dBc can be set by the user.
· [%]: Press [Measure]→ [OBW]→ [%] to set the power percentage in the
percentage method.
·[dBc]: Press [Measure]→ [OBW]→ [dBc] to set the signal power drop
dBc in the power drop dBc method.
· [Span]: Press [Measure]→ [OBW]→ [Channel Sweep] to set the
sweeping frequency bandwidth of occupied bandwidth measurement.
The spectrum analyzer has the function of adjacent channel power ratio measurement. The user can obtain
measurement results by setting relevant parameters of the channel. By using the limit test function, the user can
define the adjacent channel limits so as to easily observe whether the adjacent channel power exceeds the set
range. Refer to the requirements of adjacent channel power ratio measurement in the first section of this chapter for
specific operations.