Panoramic TVP-2914, Руководство по обслуживанию

Страница: 20 / 52

TVP-2914
19
Point X, Y LIMITS (mm)
BG, RG BG
a 0,4 0,4
b, c 1,2 1,2
d, e 1,0 1,0
f, g, h, j 1,5 2,0
f’, g', h', j' 1,2 1,5
k, l, m, n 1,2 1,2
s, t, u, v 1,0 1,0
2.6 Video
2.6.1 Sensibility and Signal /Noise Rate
a) Adjust the TV to a “PP” condition.
b) Apply to the antenna input a 60dB
µ
V signal with 88% AM modulation, 1kHz
sine wave (Frequency and channel factory defined).
c) Connect at the output video detector na AC voltmeter and read the voltage
V
AC.
d) Turn off the AM modulation and read the noise level “Vr” (AC voltmeter)
.
e) Calculate the signal-noise rate as following:
S/N=20 log (V
AC
/ V
R
).
f) Reduce the output level signal generator till the rate S/N reach 20 dB. In
this condition the output level signal generator is the sensibility in dBuV.
Minimum Nominal Maximum Unit
Sensibility - 37,00 46,00 dB
µ
V
S/N 40,00 50,00 - dB