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User's Manual

ManualsBrandsFluke ManualsPortable OscilloscopesFluke 123
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123
Service Manual
4-8
8. 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.
9. Set the 5500A to source a 40 MHz leveled sine wave of 1.8V peak-to-peak.
10. Adjust the amplitude of the sine wave to 4 divisions on the test tool display.
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.
4.5.3 Input A Frequency Response Upper Transition Point Test
Proceed as follows to test the Input A frequency response upper transition point:
1. Connect the test tool to the 5500A as for the previous test (see Figure 4-3).
2. Select the following test tool setup:
• Press
to select auto ranging (AUTO in top of display).
Do not press
anymore!
• Using
change the sensitivity to select manual sensitivity ranging, and
lock the Input A sensitivity on 200 mV/div.
3. Set the 5500A to source a leveled sine wave of 1.2V peak-to-peak, 50 kHz (SCOPE
output, MODE levsin).
4. Adjust the amplitude of the sine wave to 6 divisions on the test tool display.
5. Set the 5500A to 20 MHz, without changing the amplitude.
6. Observe the Input A trace check to see if it is ≥ 4.2 divisions.
7. When you are finished, set the 5500A to Standby.
Note
The lower transition point is tested in Section 4.5.11.
4.5.4 Input A Frequency Measurement Accuracy Test
Proceed as follows to test the Input A frequency measurement accuracy:
1. Connect the test tool to the 5500A as for the previous test (see Figure 4-3).
2. Select the following test tool setup:
• Press
to select auto ranging (AUTO in top of display).
• Press
to open the INPUT A MEASUREMENTS menu, and choose:
MEASURE on A: ■ Hz
3. Set the 5500A to source a leveled sine wave of 600 mV peak-to-peak (SCOPE
output, MODE levsin).
4. Set the 5500A frequency according to the first test point in Table 4-1.
5. Observe the Input A main reading on the test tool and check to see if it is within the
range shown under the appropriate column.