Fluke 225C Service Manual - Page 47

Trace for PAL/SECAM line 622, for PAL or SECAM

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4 Performance Verification 4.6 Scope Input A&B Tests • sync pulse amplitude > 0.7 div. • chroma amplitude zero. 4. Observe the trace, and check to see if the test tool triggers on line number: ⇒ 622 for PAL or SECAM, see Figure 4-9 ⇒ 525 for NTSC, see Figure 4-10. Figure 4-9. Trace for PAL/SECAM line 622 Figure 4-10. Trace for NTSC line 525 5. Using select line number: ⇒ 310 for PAL or SECAM ⇒ 262 for NTSC 6. Observe the trace, and check to see if the test tool triggers on: ⇒ line number 310 for PAL or SECAM, see Figure 4-11. ⇒ line number 262 for NTSC, see Figure 4-12. Figure 4-11. Trace for PAL/SECAM line 310 Figure 4-12. Trace for NTSC line 262 7. Apply the inverted TV Signal Generator signal to the test tool. Invert the signal by using a Banana Plug to BNC adapter (Fluke PM9081/001) and a Banana Jack to BNC adapter (Fluke PM9082/001), as shown in Figure 4-13. 4-23

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Performance Verification
4.6 Scope Input A&B Tests
4
4-23
•
sync pulse amplitude > 0.7 div.
•
chroma amplitude zero.
4.
Observe the trace, and check to see if the test tool triggers on line number:
⇒
622 for PAL or SECAM, see Figure 4-9
⇒
525 for NTSC, see Figure 4-10.
Figure 4-9. Trace for PAL/SECAM line 622
Figure 4-10. Trace for NTSC line 525
5.
Using
select line number:
⇒
310 for PAL or SECAM
⇒
262 for NTSC
6.
Observe the trace, and check to see if the test tool triggers on:
⇒
line number 310 for PAL or SECAM, see Figure 4-11.
⇒
line number 262 for NTSC, see Figure 4-12.
Figure 4-11. Trace for PAL/SECAM line 310
Figure 4-12. Trace for NTSC line 262
7.
Apply the inverted TV Signal Generator signal to the test tool.
Invert the signal by using a Banana Plug to BNC adapter (Fluke PM9081/001) and a
Banana Jack to BNC adapter (Fluke PM9082/001), as shown in Figure 4-13.