R3131 Spectrum Analyzer Operation Manual
2.2 Basic Operation
2-53Apr 10/98
5. Press SHIFT and CONFIG (PRESET).
The default settings have now been reset.
Setting the measurement conditions
This changes the analyzer settings so that the input signal is displayed more clearly.
6. Press FREQ, 2, 0, 0 and MHz.
A center frequency of 200 MHz is set.
7. Press SPAN, 1 and kHz.
A frequency span of 1 kHz is set.
8. Press BW, RBW AUTO/MNL, 1, 0 and kHz.
The RBW is set to 10 kHz. The attenuator level default setting is 10 dB, which
makes the input to the mixer -20 dBm (= -10 dBm - 10 dBm). Since the mixer
level exceeds the distortion limit, spurious peaks (3 and 4) appear in addition to
the normal peaks (1 and 2).
Figure 2-47 Screen Display Showing Intermodulation Distortion
Changing the attenuator
9. Press LEVEL, ATT AUTO/MNL, 3, 0 and GHz (dB).
The attenuator level is set to 30 dB.
Under these conditions, the mixer input level is -40 dBm, and spurious peaks
(peaks 3 and 4 in Figure 2-47) are not produced.
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