R3132 Series Spectrum Analyzer Operation Manual
2.3.8 Spectrum Mask Measurement
2-89
2.3.8 Spectrum Mask Measurement
The ACP is measured using the ratio of the adjacent leakage power to the total power on the full screen,
while the spectrum mask is measured using the ratio of the adjacent channel power to the power within the
BS (specified bandwidth) on the full screen. In addition, the near band spurious spectrum can be measured
because the power relative to the power at the marker point can be measured by setting an adjacent chan-
nel’s BS to 0 Hz. It is possible to make Pass/fail judgments for the near band spurious spectrum when the
power is adjusted to the maximum power using a limit line.
In this section, the method used to measure modulating signals used for IS-95 (cdmaOne) is described.
Measurement conditions:The signal to be measured is a signal used for cdmaOne, and has a frequency of
825 MHz and a level of 0 dBm. Use appropriate parameter values to make the measurements shown below.
Setup
1. Connect the instrument as shown in Figure 2-90.
Figure 2-90 Setup for Measuring the Spectrum Mask
Power on
2. Turn the analyzer and the unit under test power on.
Setting the unit under test
3. Activate the signal output for the unit under test.
Initialization
This resets the current settings to the factory defaults or user-defined presets.
4. Press SHIFT and CONFIG(PRESET).
This sets the analyzer to its presets values.
Setting the Limit Line
In this example, the template compatible with IS-95 is used to set the limit line. The
frequencies are relative to the center frequency on the horizontal axis, and the levels
are relative to the reference position located at the highest level on the vertical axis.
R3132 Series Spectrum analyzer
Unit under test
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