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Performance Verification
1740A/1750A/1760 – Series Service Manual
4–29
c.
Check – that the dots on the vector display are clear and do not have
tails and the lines between the dots are reasonably straight.
d. Select 100% bars on the color bar signal.
e.
Enter the CONFIG menu. Select VECTOR, then select 100% BARS. If
desired, press the CLEAR MENU button to remove the readout.
f.
Check – that all the color vector dots can be placed within the boxes
1.25
°
and an amplitude of
2.5%. Note: The burst vector position is
not critical.
g. Check – that the dots on the vector display are clear and do not have
tails and the lines between the dots are reasonably straight.
h. Select 75% bars on the color bar signal.
i.
Enter the CONFIG menu and select 75% BARS. Exit the CONFIG
menu.
j.
(PAL ONLY) Enter the CONFIG menu and select VECTOR, and then
V ON. If desired, press the CLEAR MENU button to remove
the readout.
k. (PAL ONLY) Check – that the burst vectors can be overlayed within
2
°
.
l.
(PAL ONLY) Enter the CONFIG menu and V OFF.
m. Select INT REF.
24. Lock-In Range
Requirement – Subcarrier Regenerator Pull-in Range: NTSC
50 Hz.
PAL
10 Hz.
a. Set the television signal generator SPG2 Option AA Variable Subcarrier
Frequency Offset push-button switch to On. Set the Frequency button to
offset the frequency 50 Hz for NTSC. (For PAL, use the SPG12 Option
AA button to offset the frequency 10 Hz.)
b. On the television signal generator, press the
50 Hz button (
10 Hz
button for PAL).
c.
Check – that the display is locks
1 second.
d. Select EXT REF and repeat parts a. through d.
e.
Select INT REF.
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Содержание 1740A Series
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