R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
2.3.5 Measuring the Occupied Bandwidth (OBW)
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4.
Press SHIFT and CONFIG(PRESET).
This sets the analyzer to its presets values.
Setting the measurement conditions
This changes the analyzer settings so that the input signal is displayed more clearly.
5.
Press FREQ, 9, 4, 0, ., 0, 5 and MHz.
A center frequency of 940.05 MHz is set.
6.
Press SPAN, 1, 0, 0 and kHz.
A frequency span of 100 kHz is set.
NOTE:
The optimum span is approximately three times the occupied bandwidth.
7.
Press ATT, ATT AUTO/MNL(MNL), 3, 0 and GHz(dB).
The attenuator is set to 30 dB.
NOTE:
Set the attenuator to ’input level + 10 dB’ or more to avoid saturation at the
input mixer.
8.
Press LEVEL, 5 and MHz(-dBm).
The reference level is set to -5 dBm.
9.
Press COUPLE, RBW AUTO/MNL(MNL), 3, 0, 0 and Hz.
An RBW is set to 300 Hz.
10. Press A, Trace A Detector and Positive.
The trace detector is set to the positive detector mode.
11. Press LEVEL and adjust the reference level using the data knob.
When the signal peak is one or more divisions away from the reference level,
adjust the signal peak using the data knob so that they are close as much as pos-
sible.
12. Press SWP, Sweep Time AUTO/MNL(MNL), 2, 0 and MHz(sec).
A sweep time of 20 seconds is set.
NOTE:
Set the sweep time equal to or greater than the number of data points (1001)
multiplied by the burst repetition time.
