Viewing An Am Signal; Measuring Modulation In Zero Span - HP 8590 E-Series User Manual

3. To demodulate the AM, press [Bw). Increase the resolution bandwidth to include both
sidebands of the signal within the passband of the spectrum analyzer.
4. Next, position the signal peak near the reference level and select a linear voltage display.
Press and change the reference level, then press
LIN.
5. To select zero span, either press (SPAN), 0 IHz) or press ZERO SPAN . See Figure 3-27. If
the modulation is a steady tone (for example, from a signal generator), use video trigger
to trigger on the waveform and stabilize the display. Adjust the sweep time to change the
horizontal scale.
Use markers and delta markers to measure time parameters of the waveform.
Figure 3-27. Measuring Modulation in Zero Span
REF 0 dBm
PEAK
LOG
10
C E N T E R 3 0 0 0 0 MHz C E N T E R 3 0 0 0 0
Figure 3-26. Viewing an AM Signal Figure 3-26. Viewing an AM Signal
1
C E N T E R 3 0 0 0 0 0 M H Z
I I
S P A N 2 0 . 0 0 MHz S P A N 2 0 . 0 0
3 0 0 kHz
SCALE LOG LIN
S P A N 0 H
Z
Making Basic Measurements 3-25
to underline