Agilent Technologies HP8648A Manual do Utilizador descarregar pdf (Página 152)

100

101

AM Receivers

151

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

15. Select AC Level.

16. Press the REF SET key.

17. Change AFGen1 Freq from 300 Hz to 3 kHz while observing AC Level

Meter.

Frequency Response is displayed on the screen as AC Level in relative dB

(from 300Hz to 3 kHz) as shown.

NOTE: The audio response should not vary more than +2 to −14 dB (Receiver’s with

loudspeakers) or +1 to −8 dB (Receivers with headphones or feed a line) from

a standard 6 dB per octave de-emphasis curve over the frequency range of 300

to 3 kHz.

Audio

Frequency

Response

To Screen

RX TEST

AC Level

Filter 1

50Hz HPF

Filter 2

15kHz HPF

Atten Hold

On/Off

Ext Load R

8.00

Ω

RF GEN

RF ANL

AF ANL

SCOPE

SPEC ANL

ENCODER

DECODER

RADIO INT

-4.72

SINAD

RF Gen Freq

28.310000

MHz

Amplitude

-47.0

dBm

Output Port

RF Out/Dupl

AFGen1 Freq

0.5000

kHz

AFGen2 Freq

1.0000

kHz

AFGen2 To

Off

0 -0.07 24

Ref

AFGen1 To

30.0

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 319 320

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Agilent Technologies HP8648A Manual do Utilizador Página 152

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