Fluke 124B/S Service Manual - Page 42

Input B Trigger Sensitivity Test

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Fluke 123/124/125 Service Manual Note The lower transition point is tested in Section 3.5.11. 3.5.7 Input B Trigger Sensitivity Test Proceed as follows to test the Input B trigger sensitivity: 1. Connect the test tool to the 5500A as for the previous test (see Figure 3-4). 2. Select the following test tool setup: • Turn Input B on (if not already on). • 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 B sensitivity on 200 mV/div. • Fluke 123/124: press / to open the SCOPE INPUTS menu. • Fluke 123/124: press to open the TRIGGER menu, and choose: INPUT: B | SCREEN UPDATE: FREE RUN | AUTO RANGE: >15Hz • Fluke 125: press to open MENU. • Fluke 125: press to open the TRIGGER menu, and choose : INPUT: B | UPDATE: FREE RUN | AUTO RANGE: >15Hz 3. Set the 5500A to source a 5 MHz leveled sine wave of 100 mV peak-to-peak (SCOPE output, MODE levsine). Set the 5500A to Operate (OPR). 4. Adjust the amplitude of the sine wave to 0.5 division on the display. 5. 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. The trigger level is indicated by the trigger icon ( ). 6. Set the 5500A to source a 25 MHz (Fluke 123) or 40 MHz (Fluke 124/125) leveled sine wave of 400 mV peak-to-peak. 7. Adjust the amplitude of the sine wave 1.5 divisions on the test tool display. 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 (Fluke 123) or 60 MHz (Fluke 124/125) leveled sine wave of 1.8V peak-to-peak. 10. Adjust the amplitude of the sine wave to exactly 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. 3-12

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Fluke 123/124/125
Service Manual
3-12
Note
The lower transition point is tested in Section 3.5.11.
3.5.7 Input B Trigger Sensitivity Test
Proceed as follows to test the Input B trigger sensitivity:
1.
Connect the test tool to the 5500A as for the previous test (see Figure 3-4).
2.
Select the following test tool setup:
•
Turn Input B on (if not already on).
•
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 B sensitivity on 200 mV/div.
•
Fluke 123/124: press
/
to open the SCOPE INPUTS menu.
•
Fluke 123/124: press
to open the TRIGGER menu, and choose:
INPUT:
B | SCREEN UPDATE:
FREE RUN | AUTO RANGE:
>15Hz
•
Fluke 125: press
to open MENU.
•
Fluke 125: press
to open the TRIGGER menu, and choose :
INPUT:
B | UPDATE:
FREE RUN | AUTO RANGE:
>15Hz
3.
Set the 5500A to source a 5 MHz leveled sine wave of 100 mV peak-to-peak (SCOPE
output, MODE levsine). Set the 5500A to Operate (OPR).
4.
Adjust the amplitude of the sine wave to 0.5 division on the display.
5.
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. The trigger level
is indicated by the trigger icon (
).
6.
Set the 5500A to source a 25 MHz (Fluke 123) or 40 MHz (Fluke 124/125) leveled sine
wave of 400 mV peak-to-peak.
7.
Adjust the amplitude of the sine wave 1.5 divisions on the test tool display.
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 (Fluke 123) or 60 MHz (Fluke 124/125) leveled sine
wave of 1.8V peak-to-peak.
10.
Adjust the amplitude of the sine wave to exactly 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.