Panoramic TVP-2914, Руководство по обслуживанию

Страница: 22 / 52

TVP-2914
21
2.6.5 AFT circuit.
a) Apply to the antenna input a 60dB
µ
V signal with 88% AM modulation with
PAL-M COLOR BAR pattern (Frequency and channel factory defined), and
FM sine wave 400 Hz audio modu-25 kHz deviation
b) Connect a oscilloscope in the output video detector and read the peak to
peak burst level signal “Vb”
c) Increment the generator frequency by 500 kHz and read the new value
peak to peak burst signal “Vh” and calculate the percentage as following:
E
H
= V
H
/V
B
d) Decrement the generator frequency by 500 kHz and repeat the
procedure(c) reading the peak-to-peak burst signal V
L
and calculate the
percentage as following:
E
L
= V
L
/V
B
Minimum Nominal Maximum Unit
E
H
-0,80 0,00 +1,00 %
E
L
-0,80 0,00 +1,50 %