Fluke 225C Service Manual - Page 41

Input A Trigger Sensitivity Test, Set the 5500A to source a 0.8 ms time marker MODE marker.

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4 Performance Verification 4.6 Scope Input A&B Tests the center of the display bottom. Adjust the trigger delay time to 8.000 ms (A →| 8.00 ms ) • Using set the time base on 10 μs/div. 4. Using 7.990 ms. move the trace to the right until the indicated trigger delay is 5. Examine the rising edge of the time marker pulse at the height of the trigger level indicator top. Verify that the rising edge is at the second grid line from the left. The allowed deviation is ±3 pixels, see Figure 4-6. 6. Select the following test tool setup: • Using change the time base to select manual time base ranging, and lock the time base on 10 ms/div). • Using move the trace to adjust the trigger delay time to 800.0 μs (A 800.0 μs). • Using set the time base on 1 μs/div. 7. Set the 5500A to source a 0.8 ms time marker (MODE marker). 8. Using 799.0 μs. move the trace to the right until the indicated trigger delay is 9. Examine the rising edge of the time marker pulse at the vertical height of the trigger level indicator top. Verify that the rising edge is at the second grid line from the left. The allowed deviation is ±3 pixels, see Figure 4-6. Figure 4-6. Time Base Verification 190c-tb1.bmp 4.6.9 Input A Trigger Sensitivity Test Proceed as follows to test the Input A trigger sensitivity: 1. Connect the test tool to the 5500A as for the previous test (see Figure 4-5). 2. Select the following test tool setup: • Reset the test tool 4-17

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Performance Verification
4.6 Scope Input A&B Tests
4
4-17
the center of the display bottom.
Adjust the trigger delay time to 8.000 ms (
A
→
| 8.00 ms
)
•
Using
set the time base on 10
μ
s/div.
4.
Using
move the trace to the right until the indicated trigger delay is
7.990 ms.
5.
Examine the rising edge of the time marker pulse at the height of the trigger level
indicator top.
Verify that the rising edge is at the second grid line from the left.
The
allowed deviation is
±
3 pixels, see Figure 4-6.
6.
Select the following test tool setup:
•
Using
change the time base to select manual time base ranging, and lock
the time base on 10 ms/div).
•
Using
move the trace to adjust the trigger delay time to 800.0
μ
s
(
A
800.0
μ
s
).
•
Using
set the time base on 1
μ
s/div.
7.
Set the 5500A to source a 0.8 ms time marker (MODE marker).
8.
Using
move the trace to the right until the indicated trigger delay is
799.0
μ
s.
9.
Examine the rising edge of the time marker pulse at the vertical height of the trigger
level indicator top.
Verify that the rising edge is at the second grid line from the left.
The allowed deviation is
±
3 pixels, see
Figure 4-6.
190c-tb1.bmp
Figure 4-6. Time Base Verification
4.6.9 Input A Trigger Sensitivity Test
Proceed as follows to test the Input A trigger sensitivity:
1.
Connect the test tool to the 5500A as for the previous test (see Figure 4-5).
2.
Select the following test tool setup:
•
Reset the test tool