CCE HPS-2971 - Vertical Linearity Measurement

HPS-2971
3.3.5 Vertical Linearity
a) Connect the receiver to a 117V
AC
line
Turn on the TV and adjust bright and contrast control to max. position,
saturation and volume to min. Position. Wait for the heat period (please see
the specification for this model).
b) Apply to the antenna input a 60dBµV level signal with 88% modulated
PHILIPS pattern (frequency and channel factory defined).
c) Adjust bright and contrast control to nominal position
d) For the next reads, please take references by figure E
e) Observe the screen pattern and check the distances X –(in centimeters)
f) Calculate the middle distances through blocks:
a
medium
=X/11.
Major vertical deviation between blocks (DV
M
).
Read first the 11 blocks height (from a1 to a11) and select the biggest of them
(a
max
) for calculate the deviation:
DV
M
= a
max
/a
medium
Minor vertical deviation between blocks (DV
m
)
Read first the 11 blocks height (from a1 to a11) and select the smallest of
them (a
min
) for calculate the deviation:
DV
m
= a
min
/a
medium
(*)Check for signals PAL-M and PAL-N
PAL-M Minimum Nominal Maximum Unit
DV
M
- 1,10 1,40
DV
m
0,60 0,90 -