CCE HPS-141, Руководство по обслуживанию

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HPS-141
21
2.6.4 Vertical sensitivity
a) Adjust the TV to a “PP” condition.
b) Apply to the antenna input a 60dB
µ
V signal with 88% AM modulation with PAL-M color
pattern (Frequency and channel factory defined), and FM sine wave 1kHz audio
modu-25 kHz deviation.
c) Observe the TV screen under test and reduce the output generator level until maintain the
stability of the image in the vertical direction and when there is the instability of the image
in the vertical direction, increase the output generator level until the stability of the image
comes back in the vertical direction. At this condition the output generator level represents
the vertical sensitivity in dB
µ
V.
Note.: If the TV under test is two or three-system mode, repeat this procedures for the
PAL-N and NTSC-M signal system.
Condition Minimum Nominal Maximum Unit
PAL-M - 20,00 23,00
dB
µ
V
PAL-N - 20,00 23,00
dB
µ
V
NTSC-M - 20,00 23,00
dB
µ
V
2.6.5 Chrome sensibility
a) Adjust the TV to a “PP” condition.
b) Apply to the antenna input a 60dB
µ
V signal with 88% AM modulation with PAL-M color
pattern (Frequency and channel factory defined), and FM sine wave 1kHz audio
modu-25 kHz deviation.
c) Observe the TV screen under test and reduce the output generator level until the color
pattern be visible. At this condition the output generator level represents the sensibility of
chrome in dB
µ
V.
Note.: If the TV under test is two or three-system mode, repeat this procedures for the
PAL-N and NTSC-M signal system.
Condition Minimum Nominal Maximum Unit
PAL-M - 28,00 30,00
dB
µ
V
PAL-N - 28,00 30,00
dB
µ
V
NTSC-M - 28,00 30,00
dB
µ
V