Fluke 123B/S Service Manual - Page 70

Input A and B Trigger Level and Trigger Slope Test, positive slope

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123/124 Service Manual 11. Verify that the signal is well triggered. If it is not, press to enable the up/down arrow keys for Trigger Level adjustment; adjust the trigger level and verify that the signal will be triggered now. 12. When you are finished, set the 5500A to Standby. 4.5.8 Input A and B Trigger Level and Trigger Slope Test Proceed as follows: 1. Connect the test tool to the 5500A as shown in Figure 4-5. Figure 4-5. Test Tool Input A-B to 5500A Normal Output ST8001.WMF 2. Select the following test tool setup: • Turn Input B on ( if not already on). • Using change the sensitivity to select manual sensitivity ranging, and lock the Input A and Input B sensitivity on 1V/div. • Move the Input A and Input B ground level (indicated by zero icon ) to the center grid line. Proceed as follows: Press to enable the arrow keys for moving the Input A ground level. Press to enable the arrow keys for moving the Input B ground level. Using the keys move the ground level. • Using change the time base to select manual time base ranging, and lock the time base on 10 ms/div. • Press to open the SCOPE INPUTS menu. • Press to open the TRIGGER menu, and choose: INPUT: I A | SCREEN UPDATE: I FREE RUN | AUTO RANGE: I >15HZ • Press to enable the arrow keys for Trigger Level and Slope adjustment. • Using select positive slope triggering (trigger icon ). • Using set the trigger level to +2 divisions from the screen center. For positive slope triggering, the trigger level is the top of the trigger icon ( ). 4-12

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Service Manual
4-12
11.
Verify that the signal is well triggered.
If it is not, press
to enable the up/down arrow keys for Trigger Level
adjustment; adjust the trigger level and verify that the signal will be triggered now.
12.
When you are finished, set the 5500A to Standby.
4.5.8 Input A and B Trigger Level and Trigger Slope Test
Proceed as follows:
1.
Connect the test tool to the 5500A as shown in Figure 4-5.
ST8001.WMF
Figure 4-5. Test Tool Input A-B to 5500A Normal Output
2.
Select the following test tool setup:
•
Turn Input B on ( if not already on).
•
Using
change the sensitivity to select manual sensitivity ranging, and
lock the Input A and Input B sensitivity on 1V/div.
•
Move the Input A and Input B ground level (indicated by zero icon
) to the
center grid line.
Proceed as follows:
Press
to enable the arrow keys for moving the Input A ground level.
Press
to enable the arrow keys for moving the Input B ground level.
Using the
keys move the ground level.
•
Using
change the time base to select manual time base ranging, and lock
the time base on 10 ms/div.
•
Press
to open the SCOPE INPUTS menu.
•
Press
to open the TRIGGER menu, and choose:
INPUT:
■
A | SCREEN UPDATE:
■
FREE RUN | AUTO RANGE:
■
>15HZ
•
Press
to enable the arrow keys for Trigger Level and Slope adjustment.
•
Using
select positive slope triggering (trigger icon
).
•
Using
set the trigger level to +2 divisions from the screen center.
For
positive slope
triggering, the trigger level is the
top
of the trigger icon (
).