Input A Frequency Response Upper Transition Point Test; Input A Frequency Measurement Accuracy Test - Fluke ScopeMeter 123 Service Manual

123
Service Manual
8. Verify that the signal is well triggered.
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.
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:
3. Set the 5500A to source a leveled sine wave of 1.2V peak-to-peak, 50 kHz (SCOPE
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.

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:
3. Set the 5500A to source a leveled sine wave of 600 mV peak-to-peak (SCOPE
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
4-8
If it is not, press
adjustment; adjust the trigger level and verify that the signal will be triggered now.
If it is not, press
adjustment; adjust the trigger level and verify that the signal will be triggered now.
•
Press to select auto ranging (
Do not press
•
Using change the sensitivity to select manual sensitivity ranging, and
lock the Input A sensitivity on 200 mV/div.
output, MODE levsin).
The lower transition point is tested in Section 4.5.11.
•
Press to select auto ranging (
•
Press to open the INPUT A MEASUREMENTS menu, and choose:
I
MEASURE on A:
output, MODE levsin).
range shown under the appropriate column.
to enable the up/down arrow keys for Trigger Level
to enable the up/down arrow keys for Trigger Level
in top of display).
AUTO
anymore!
Note
in top of display).
AUTO
Hz