Prology DVD520, Service Manual

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MEASUREMENT SETUP
Tuner FM
DUT
RF G enerator
Band pass
LF Voltmeter
e.g. PM5326
250Hz-15kHz
e.g. 7122 707 48001 e.g. PM2534
S/N and distortion meter
e.g. Sound Technology ST1700B
U se a bandpass filter to el iminate hum(50Hz,100Hz) and disturbance from the pilottone( 19kHz,38kHz).
Tuner AM (MW,LW)
DUT
RF Gen erator
Bandpass
LF Voltmeter
e.g. PM5326
250Hz-15kHz
e.g. 7122 707 48001
e.g. PM2534
S/N and distortion meter
e.g. S ound Technology ST1700B
Frame aeria l
e.g. 7122 707 89001
To avoid atmospheric interference all AM-measurement s have to be carried out in a Faraday s cage.
Use a bandpass filter ( or at lea st a high pas s filter with 2 50Hz) to eliminate hum ( 50Hz,100Hz ).
'
DUT
L
R
L EVEL METE R
e.g. Sennheiser UPM550
with FF-filter
S/N and dis tortion meter
e.g. Sound Technology ST1700B
Use Au dio Signal Disc SBC429 4822 397 30184
(replac es test disc 3)
CD
1-3