CCE HPS-1478, Руководство по обслуживанию

Страница: 7 / 55

HPS-1478
3. TECHNICAL SPECIFICATION
Procedure to check up color TV electrical parameters
3.1 Audio
3.1.1 Output power at 10% THD
1
st
method: antenna input connection
a) TV setup in “PP” condition (frequency and channel factory defined).
b) Apply 60dB
µ
V signal to antenna input, modulated with white pattern in 88%
and audio signal with 1kHz frequency modulated in FM with ± 25kHz
deviation.
c) Connect to the audio power amplifier output a resistive load with equivalent
Ohm value of speaker used on the tested TV.
d) Connect a AC Voltmeter/Distortion Meter to the resistive load and increase
volume control until Distortion Meter reading be 10%.
e) Measure voltage on the resistive load and calculate power through next
equation:
P = (V²/R)
Where “V” is voltage in VOLTS, “R” is resistive load in OHMS e “P” is power
in WATTS.
2
nd
method: connection through external video and audio input
a) TV setup in “PP” condition.
b) Connect a color bar generator (PAL-M system) to video input.
c) Connect an audio generator with 500mV
AC
level and 400Hz sinusoidal
frequency to audio input.
d) Connect to the power amplifier output a resistive load with equivalent Ohm
value of speaker used on the tested TV.
e) Connect a AC Voltmeter/Distortion Meter to the resistive load and increase
volume control until Distortion Meter reading be 10%. Measure voltage on
the resistive load and calculate power through next equation:
P = (V²/R)
Where “V” is voltage in VOLTS, “R” is resistive load in OHMS and “P” is power
in WATTS.
Minimum Nominal Maximum Unit
2.00 2.90 - W
3 . 1.2 Audio Residual
a) TV setup in “PP” condition.
b) Apply 60dB
µ
V signal (frequency and channel factory defined) to antenna
input modulated with white pattern at 88% and audio signal with 1kHz
frequency modulated in FM with 25kHz deviation.