Input B Trigger Sensitivity Test - Fluke 123 Service Manual

Fluke 123/124/125
Service Manual
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:
3. Set the 5500A to source a 5 MHz leveled sine wave of 100 mV peak-to-peak (SCOPE
4. Adjust the amplitude of the sine wave to 0.5 division on the display.
5. Verify that the signal is well triggered.
6. Set the 5500A to source a 25 MHz (Fluke 123) or 40 MHz (Fluke 124/125) leveled sine
7. Adjust the amplitude of the sine wave 1.5 divisions on the test tool display.
8. Verify that the signal is well triggered.
9. Set the 5500A to source a 40 MHz (Fluke 123) or 60 MHz (Fluke 124/125) leveled sine
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.
3-12
•
Turn Input B on (if not already on).
•
Press to select auto ranging (
Do not press
•
Using change the sensitivity to select manual sensitivity ranging, and lock
the Input B sensitivity on 200 mV/div.
•
Fluke 123/124: press
•
Fluke 123/124: press
INPUT: B | SCREEN UPDATE:
•
Fluke 125: press
•
Fluke 125: press
INPUT: B | UPDATE:
output, MODE levsine). Set the 5500A to Operate (OPR).
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 ( ).
wave of 400 mV peak-to-peak.
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.
wave of 1.8V peak-to-peak.
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.
Note
AUTO
in top of display).
anymore!
/ to open the SCOPE INPUTS menu.
to open the TRIGGER menu, and choose:
FREE RUN | AUTO RANGE:
to open MENU.
to open the TRIGGER menu, and choose :
FREE RUN | AUTO RANGE:
>15Hz
>15Hz