Chapter 3 105
Making Measurements
Modulation Distortion Measurement
3. Press FM De-Emphasis to select a value. This key is enabled only when the
Modulation Mode is FM.
4. Press
Modulation Mode to select from AM, FM and PM.
Step 9. To adjust the display, press
AMPLITUE/Y Scale, then:
1. Press the
Display Unit key and select a display unit key. The default
setting is
%.
2. Press the
Display Mode key to toggle between Normal and Ratio. The default
setting is
Normal.
3. Press the
Ratio Ref key to toggle between Auto and Man. When you select Man,
input the reference value and unit. When the reference is set to 0 or the
measurement result is 0 under log ratio mode, the result displayed is “- - -”.
4. Press the
Ratio Mode key to toggle between Log and Linear.
Modulation Distortion Measurement Example
Figure 3-17 AM Modulation Distortion Measurement Result
Signal Under Test: RF Frequency: 1.25 GHz; Amplitude: 0.0 dBm;
AM Depth: 10%; AM Rate: 100 kHz; Modulation: On.
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