Tektronix 1740A Series, User Manual

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Performance Verification
4–24
1740A/1750A/1760 – Series Service Manual
a. Select 2 LINE SWEEP (10
m
s/div) and turn on the MAG SWEEP.
b. Set the pulse and bar signal controls as follows: Overlay On, Amplitude
Full, Luminance On, Setup Off (NTSC only), Window Off, Field Sq
Wave Off, Burst On, T Pulse On, and T Bar On.
c. Check – that the preshoot, overshoot, and ringing is within
"
1%
(0.5 minor division).
d. Check – that the pulse amplitude is within
"
1 IRE (0.7 mV PAL) of the
bar amplitude (0.5 minor division).
e. Enter the GAIN menu and select X10. If desired, press the CLEAR
MENU button to remove the readout.
f. Check – that the preshoot, overshoot, and ringing is within
"
1%
(1 major division).
g. Check – that the pulse amplitude is within
"
1 IRE (0.7 mV PAL) of the
bar amplitude (1 major division).
h. Select 1 FIELD SWEEP and turn Off the MAG SWEEP.
i. Set pulse and bar signal Field Sq Wave to On.
j. Check – for tilt of
v
1% (1 major division).
k. Enter the GAIN menu and select X1. Exit the GAIN menu.
18. Restorer Response
Requirement – 60 Hz (50 Hz PAL) Attenuation: Slow Mode
v
10%. Fast
Mode
w
95%.
a. Select 2 LINE SWEEP (10
m
s/div).
b. Replace the pulse and bar signal on the CH-A INPUT with the function
generator output. Leave the loop-through connector terminated.
c. Set the function generator frequency to 60.0 Hz (50.0 Hz PAL), and
adjust the amplitude for a 140 IRE (1.0 V PAL) display.
d. Turn on the DC REST and select INT REF.
e. Enter the CONFIG menu. Select INPUT, then select CLAMP ST (Sync
Tip) . If desired, press the CLEAR MENU button to remove the
readout.
f. Check – that the displayed amplitude is
u
126 IRE (900 mV PAL).
g. Enter the CONFIG menu and select CLAMP BP (backporch). If
desired, press the CLEAR MENU button to remove the readout.
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