Fluke 225C Service Manual - Page 49

for PAL, PALplus, or SECAM, Polarity, POSITIVE, SECAM, ALL LINES

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4 Performance Verification 4.6 Scope Input A&B Tests Proceed as follows: 1. Connect the test tool to the calibrator as shown in Figure 4-16. Figure 4-16. Test Tool Input A to TV Signal Generator al55sca.bmp 2. Select the following test tool setup: • Reset the test tool • Press , then press to open the Trigger Options menu. • Choose VIDEO on A... , then from the shown opened menu choose Polarity: POSITIVE | PAL ( or NTSC PALplus SECAM ) • Press to select ALL LINES • Press to enable the arrow keys for selecting the video line number. • Using select line number: ⇒ 622 for PAL, PALplus, or SECAM ⇒ 525 for NTSC. • Using and set the Input A sensitivity to 2 V/div (the actual probe setting is 10:1). • Using select the time base to 20 μs/div. 3. Set the calibrator to mode video with amplitude +100%. Set format and marker line number to : ⇒ PAL 622 (even), for PAL and PALplus ⇒ SECAM 622 (even), for SECAM ⇒ NTSC 262 even, for NTSC. 4. Observe the trace, and check to see if the test tool triggers on the negative pulse before the marker pulse (see Figure 17). 4-25

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Performance Verification
4.6 Scope Input A&B Tests
4
4-25
Proceed as follows:
1.
Connect the test tool to the calibrator as shown in Figure 4-16.
al55sca.bmp
Figure 4-16. Test Tool Input A to TV Signal Generator
2.
Select the following test tool setup:
•
Reset the test tool
•
Press
, then press
to open the Trigger Options menu.
•
Choose
VIDEO on A...
, then from the shown opened menu choose
Polarity:
POSITIVE |
PAL
(
or
NTSC
PALplus
SECAM
)
•
Press
to select
ALL LINES
•
Press
to enable the arrow keys for selecting the video line number.
•
Using
select line number:
⇒
622 for PAL, PALplus, or SECAM
⇒
525 for NTSC.
•
Using
and
set the Input A sensitivity to 2 V/div (the actual probe setting
is 10:1).
•
Using
select the time base to 20
μ
s/div.
3.
Set the calibrator to mode video with amplitude +100%.
Set format and
marker line
number to :
⇒
PAL 622 (even), for PAL and
PALplus
⇒
SECAM 622 (even), for SECAM
⇒
NTSC 262 even, for NTSC.
4.
Observe the trace, and check to see if the test tool triggers on the negative pulse
before the marker pulse (see Figure 17).