R3131 Spectrum Analyzer Operation Manual
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2.3.2 Measuring the Occupied Bandwidth (OBW)
2.3.2 Measuring the Occupied Bandwidth (OBW)
The occupied bandwidth can be calculated from the measured screen data using the OBW function. In this
operation, the ratio of the OBW to the total power ranges from 10.0 to 99.8%. The initial setting is 99%.
Measurement conditions:
This example shows how to measure the occupied bandwidth for a unit similar to PHS outputting a fre-
quency of 1895.15 MHz, an OBW of 288 kHz and a level of 20 dBm.
Use appropriate parameter values to make the measurements shown below.
NOTE: Set the reference level and the frequency span so that the signal amplitude on the screen is 50 dB or more
in order to reduce operation error (when the signal amplitude on the screen does not exceed 50 dB, the
operation error is large). The optimum span is approximately three times the occupied bandwidth.
Setup
1. Connect the unit under test as shown in Figure 2-56.
R3131 Spectrum analyzer
Unit under test
Figure 2-56 Setup for Measuring the Occupied Bandwidth
Power on
2. Turn the power on.
Setting the unit under test
3. Turn on the signal output for the unit under test.
Initialization
2-62
This resets the current settings to the factory defaults.
4. Press SHIFT and CONFIG (PRESET).
The default settings have now been reset.
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