Tektronix 1740A Series, User Manual

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Performance Verification
1740A/1750A/1760 – Series Service Manual
4–23
b. Set the leveled sine wave generator frequency to 3.58 MHz (4.43 MHz
PAL), and adjust the amplitude to place the signal on the compass rose.
c. Set the leveled sine wave generator frequency to 2.98 MHz (3.83 MHz
PAL).
d. Check – that the circle is inside the 3 dB marks.
e. Set the leveled sine wave generator frequency to 3.18 MHz (4.03 MHz
PAL).
f. Check – that the circle is outside the 3 dB marks.
g. Set the leveled sine wave generator frequency to 4.18 MHz (5.03 MHz
PAL).
h. Check – that the circle is inside the 3 dB marks.
i. Set the leveled sine wave generator frequency to 3.98 MHz (4.83 MHz
PAL).
j. Check – that the circle is outside the 3 dB marks.
k. Select WAVEFORM DISPLAY.
l. Enter the FILTER menu and select FLAT. Exit the FILTER menu.
16. Overscan
Requirement – Overscan Baseline Distortion: 1% (7 mV) variation.
a. Replace the leveled sine wave generator output on the CH-A INPUT
with the pulse and bar signal from the television signal generator. Leave
the loop-through terminated.
b. Select 1 LINE SWEEP (5
m
s/div).
c. Enter the GAIN menu and select X10. If desired, press the CLEAR
MENU button (front panel) to remove the readout.
d. Set the pulse and bar signal Field Sq Wave to Off.
e. Check – that the bottom of the mod pulse baseline varies 7 mV
(0.7 major division), while being positioned vertically over the entire
140 IRE (1.0 V PAL) graticule area.
f. Enter the GAIN menu and select X1. Exit the GAIN menu.
17. Transient Response (Waveform Display)
Requirement – Preshoot, Overshoot, and Ringing: 1%. Pulse-to-Bar
Ratio: 0.99:1 to 1.01:1. Field Rate Tilt: 1%.
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