Fluke 123B/S Service Manual - Page 82

Video Trigger Test, Test Tool Input A to TV Signal Generator

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123/124 Service Manual Table 4-9. Capacitance Measurement Verification Points 5500A output Reading 40 nF 300 nF 3 µF 30 µF 300 µF 0 (remove test tool input connections ) 39.10 to 40.90 293.0 to 307.0 2.930 to 3.070 29.30 to 30.70 293.0 to 307.0 00.00 to 00.10 (see steps 7...10) 4.5.19 Video Trigger Test Only one of the systems NTSC, PAL, or SECAM has to be verified. Proceed as follows: 1. Connect the test tool to the VIDEO output of the TV Signal Generator as shown in Figure 4-8. Figure 4-8. Test Tool Input A to TV Signal Generator 2. Select the following test tool setup: • Reset the test tool (power off and then on with ). • Press to open the SCOPE INPUTS menu. • Press to open the TRIGGER menu and choose: I VIDEO on A... From the shown VIDEO TRIGGER menu choose: SYSTEM: I NTSC or I PAL or I SECAM LINE: I SELECT POLARITY: I POSITIVE • Using set the Input A sensitivity to 200 mV/div. ST8141.WMF 4-24

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Service Manual
4-24
Table 4-9. Capacitance Measurement Verification Points
5500A output
Reading
40 nF
39.10 to 40.90
300 nF
293.0 to 307.0
3
µ
F
2.930 to 3.070
30
µ
F
29.30 to 30.70
300
µ
F
293.0 to 307.0
0
(remove test tool input connections )
00.00 to 00.10
(see steps 7...10)
4.5.19 Video Trigger Test
Only one of the systems NTSC, PAL, or SECAM has to be verified.
Proceed as follows:
1.
Connect the test tool to the VIDEO output of the TV Signal Generator as shown in
Figure 4-8.
ST8141.WMF
Figure 4-8. Test Tool Input A to TV Signal Generator
2.
Select the following test tool setup:
•
Reset the test tool (power off and then on with
).
•
Press
to open the SCOPE INPUTS menu.
•
Press
to open the TRIGGER menu and choose:
■
VIDEO on A...
From the shown VIDEO TRIGGER menu choose:
SYSTEM:
■
NTSC
or
■
PAL
or
■
SECAM
LINE:
■
SELECT
POLARITY:
■
POSITIVE
•
Using
set the Input A sensitivity to 200 mV/div.