Performance Verification and Adjustment Procedures
TSG 90 PATHFINDER Service Manual
3–5
4. Check Burst Amplitude
a. Using the 1780 WFM + CAL function, match the top of the burst on the
lower displayed waveform to the bottom of the burst on the upper
waveform.
b. CHECK — that the burst amplitude is 285.7 mV
±
5.7 mV (40 IRE
±
0.8
IRE).
5. Check 5-Step Linearity
a. Continuing from the preceding step, set the 1780 to view the signal
using the differentiated step filter.
b. CHECK — that the difference between the highest and lowest spikes
(differentiated steps) is <1%.
6. Check Luminance Amplitude Accuracy
a. Using the 1780 WFM + CAL function, match the top of the 5-Step
waveform on the lower display to the DC level on the upper waveform.
b. CHECK — that the 5-Step amplitude is 714 mV
±
7.14 mV (100 IRE
±
1
IRE).
7. Check Rise Time
a. Set the 1780 to view the sync pulse.
b. Set the voltage cursors to the the 10% and 90% points of the sync
transitions.
c.
CHECK — that the rise and fall times (between 10% and 90%) of the
sync pulse are 140 ns
±
20 ns.
8. Check SCH Phase
a. Set the 1780 to measure SCH Phase.
b. CHECK — that the SCH Phase of the PATHFINDER Video Output is 0
°
±
5
°
.
9. Check Chrominance-to-Luminance Delay and Gain
a. Select the NTC7 Composite signal from the PATHFINDER (press D).
b. Set the 1780 to view the bottom of the modulated pulse.
c.
Use the Chroma/Luma measurement mode of the 1780 to measure both
Y/C delay and gain.
d. CHECK — that the Chroma/Luma delay is
≤
15 ns, and the gain is
≤
2%.
Содержание TSG 90 PATHFINDER
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Страница 22: ...Specifications 1 10 TSG 90 PATHFINDER Service Manual Figure 1 2 75 Color Bars Figure 1 3 Red Field...
Страница 23: ...Specifications TSG 90 PATHFINDER Service Manual 1 11 Figure 1 4 SIN X X Figure 1 5 5 Step Staircase Gray Scale...
Страница 24: ...Specifications 1 12 TSG 90 PATHFINDER Service Manual Figure 1 6 0 IRE Flat Field Figure 1 7 50 IRE Flat Field...
Страница 25: ...Specifications TSG 90 PATHFINDER Service Manual 1 13 Figure 1 8 Black Burst Figure 1 9 Field Square Wave...
Страница 26: ...Specifications 1 14 TSG 90 PATHFINDER Service Manual Figure 1 10 Multiburst Figure 1 11 Convergence Components...
Страница 27: ...Specifications TSG 90 PATHFINDER Service Manual 1 15 Figure 1 12 NTC7 Composite Figure 1 13 NTC7 Combination...
Страница 28: ...Specifications 1 16 TSG 90 PATHFINDER Service Manual Figure 1 14 FCC Composite Figure 1 15 Matrix...
Страница 29: ...Specifications TSG 90 PATHFINDER Service Manual 1 17 Figure 1 16 Safe Area...
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Страница 79: ...Diagrams Circuit Board Illustrations TSG 90 6 3 TSG 90 Block Diagram...
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