Agilent Technologies HP8648A Manuale Utente Scaricare il pdf (Pagina 133)

100

101

AM Transmitters

132

7. Select SPEC ANL screen.

8. Set Span to 1.1 MHz.

9. Set Ref Level to place the carrier peak at the top graticule line.

To set Ref Level:

• From the Marker screen, select Marker To Peak

• Select Marker To Ref Level

10. Tune Center Freq in 1 MHz steps anywhere from 400 kHz to 1 GHz in

search of harmonics, subharmonics, multiples, or spurious emissions.

11. Un-key the Transmitter.

NOTE: If spurious emissions are suspect and verify that emissions are from the

transmitter and not another source.

To measure spurious emission of the transmitter under test:

• Place at center frequency.

• Or perform the following:

a. Select Main from the Controls field.

b. Select Markers from the Choices field.

c. Position the marker on the desired peak. (Position or Next Peak)

Marker frequency and level are displayed as shown.

Lvl

Freq

SPECTRUM ANALYZER

Marker

MHz

dBm

101.12980

-99.92

BW= 3 kHz

Spurious or Harmonic

Level & Frequency

1 2 ... 128 129 130 131 132 133 134 135 136 137 138 ... 319 320

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Agilent Technologies HP8648A Manuale Utente Pagina 133

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