Fluke 54200, Руководство пользователя

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54200
Users Manual
5-38
Analog Mono Sound
General
The audio signal is FM modulated on the sound carrier signal except for SECAM L,
where the sound is AM modulated.
The sound carrier frequency is 4.5, 5.5, 6.0, or 6.5 MHz and depends on the TV system.
Broadcasters transmit the sound carrier above the vision carrier except for SECAM L in
VHF band I. In this case the sound carrier is transmitted 6.5 MHz below the vision
carrier.
The transmitted sound carrier level is 10 to 13 dB below the vision carrier level depend-
ing on the TV system (54200 default setting). A pre-emphasis is used for the FM modu-
lation of the audio signal. The frequency spectrum for analog FM-Mono Sound (PAL
B/G) is shown in Appendix D.
Operating
Fluke 54200 generates the analog mono sound for all available TV systems. Sound
parameters are automatically matched to the selected TV system.
Main features:
•
Sound frequencies for all TV systems except system M:
0.5 kHz, 1.0 kHz, 3 kHz.
TV system M:
0.3 kHz, 1.0 kHz, 3 kHz.
•
Sound carrier level setting from -5 dBc to -15 dBc.
•
Pre-emphasis On or Off (not for SECAM L).
The different sound modes for Analog Mono Sound are shown in Table 5-17.
For operating the Mono Sound, see Chapter 4, Section Sound Settings.
The instrument allows external modulation from a sound source with 54200 as the RF
modulator.
Audio and Sound Outputs
The internal generated audio signal is available at the
AUDIO OUT
and the
EURO AV
OUT
connectors. For details, see Chapter 3, Pages 3-17 and 3-18.
The modulated sound carrier signal is available at the
SOUND IF OUT connector (rear
side).