Agilent Technologies HP8648A Instrukcja Użytkownika Pobierz pdf (Strona 78)

FM Transmitters

Measurement Procedure:

1 Connect the Transmitter as shown.

CAUTION: The RF present at the Test Set RF IN/OUT connector must not exceed 60W

continuous (or 100 Watts for 10 sec/minute) or permanent instrument damage

may result.

On the Test Set:

2 Press the PRESET key.

3 Press the TX key.

On the Radio:

4 Key the Transmitter and keep keyed until the remaining steps are complet-

ed.

On the Test Set using the knob and data entry keys:

5 Set AFGen1 Lvl so that displayed FM deviation is 50% of the Transmit-

ter’s specified maximum frequency deviation (typically 2.5 kHz).

6 Set AFGen1 Lvl units to dBm.

7 Increase (more positive) AFGen1 Lvl by 16 dB.

8 Select SPEC ANL.

9 Set Span to 1.1 MHz.

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

Test Set Options Required

Spectrum Analyzer/Tracking Generator (option 102)

Special Test Considerations

Cable and adapter mismatch must be considered when

measuring harmonics and spurious emissions of a trans-

mitter. If an external attenuator is used, special care must

be taken to ensure the attenuator is not causing any spuri-

ous or harmonic emission. Also, if spurious emissions are

located, verify that the transmitter is the source, and not

another object radiated emissions near the test site

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Agilent Technologies HP8648A Instrukcja Użytkownika Strona 78