Agilent Technologies HP8648A Manual do Utilizador descarregar pdf (Página 124)

100

101

AM Transmitters

123

Measurement Procedure:

1. Connect the Transmitter Under Test 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).

On the Test Set:

2. Press the PRESET key.

3. Press the TX key.

Using the knob and data entry keys:

4. Set AF Anl In to AM Demod.

5. Set AFGen1 Lvl to the correct output level for the desired frequency

deviation (refer to microphone sensitivity and deviation specifications for

the Transmitter being tested).

6. Set Filter 1 to 300 Hz HPF.

7. Set Filter 2 to 3 kHz LPF.

8. Set De-Emphasis to Off.

NOTE: If the Test Set is equipped with the CCITT filter option, set Filter 1 to <20 Hz

HPF and Filter 2 to CCITT.

Test Set Options Required

The typical error for the standard Test Set timebase is

2-3 Hz per 1 MHz (when measuring carrier frequency). If greater

accuracy is required, use a Test with Option 001 (High Stability

Timebase).

Special Test Considerations

"Cable and Adapter Loss" on page 46.

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