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Performance Verification
4–26
1740A/1750A/1760 – Series Service Manual
b. Replace the function generator output on the CH-A INPUT with the
color bar signal from the television signal generator. Leave the
loop-through connector terminated.
c.
Enter the GAIN menu and select X10 . If desired, press the CLEAR
MENU button to remove the readout.
d. Check – that the blanking level does not shift more than 1 major
division (0.7 major division PAL) while switching the color bar signal
Burst, On and Off (for PAL generators, push U and Y together).
e.
Replace the color bar signal on the CH-A INPUT with the television
signal generator linearity signal. Leave the loop-through terminated.
f.
Set the linearity signal controls as follows: AC Bounce On, Full Field
On, 5 Steps On, and 180
°
Subcarrier On and 40 IRE (U Subcarrier On
and 280 mV PAL).
g. Check – that the blanking shift is within
1 major division (0.7 major
division PAL) while APL bounces.
h. Turn off the DC REST.
i.
Enter the GAIN menu and select X1. Exit the GAIN menu.
20. Differentiated Step Filter
Requirement – Attenuation:
40 dB at F
SC
. Step Amplitude: Within 2%
of flat display.
a. Turn the linearity signal AC Bounce Off.
b. Select 1 LINE SWEEP (5
m
s/div).
c.
Enter the FILTER menu and select DIFF. If desired, press the CLEAR
MENU button to remove the readout.
d. Enter the GAIN menu and select VARIABLE ON . If desired, press the
CLEAR MENU button to remove the readout.
e.
Adjust the VAR GAIN control (bezel knob) so that the amplitude of the
differential spikes are 100 IRE (700 mV PAL).
f.
Enter the GAIN menu and select X5. If desired, press the CLEAR
MENU button to remove the readout.
g. Check – that the differential spike tip amplitudes are within 2% (1 major
division) of each other.
h. Enter the GAIN menu and select X1. If desired, press the CLEAR
MENU button to remove the readout.
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Содержание 1740A Series
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