Agilent Technologies HP8648A Manuale Utente Scaricare il pdf (Pagina 130)

100

101

AM Transmitters

129

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.

Using the knob and data entry keys:

4. Set AF Anl In to AM Demod.

5. Set Filter 1 to 300 Hz HPF.

6. Select the AF Freq Meter.

7. Select Distn from the Choices field.

8. Set AFGen1 Lvl so that displayed AM depth is 80%.

NOTE: Do not exceed the specified input level that causes 100% depth, or the

Transmitter’s modulation limiting circuits will cause added distortion. Refer

to the input level specifications for the Transmitter being tested.

On the Radio:

9. Key the Transmitter and keep keyed until reading displays.

Distortion (in percent, or dB) is displayed on the Test Set as shown.

TX TEST

AM Depth

TX Frequency

TX Power

Distn %

MHzH

Distortion

28.310176

18.3 12.8

98.9

Depth

1 2 ... 125 126 127 128 129 130 131 132 133 134 135 ... 319 320

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Agilent Technologies HP8648A Manuale Utente Pagina 130

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