Input B Frequency Response Upper Transition Point Test; Input B Trigger Sensitivity Test - Fluke ScopeMeter 123 Service Manual

123
Service Manual
4. Set the 5500A frequency according to the first test point in Table 4-1.
5. Observe the Input B main reading on the test tool and check to see if it is within the
6. Continue through the test points.
7. When you are finished, set the 5500A to Standby.

4.5.6 Input B Frequency Response Upper Transition Point Test

Proceed as follows to test the Input B frequency response upper transition point:
1. Connect the test tool to the 5500A as for the previous test (see Figure 4-4).
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 B trace check to see if it is ≥ 4.2 divisions.
7. When you are finished, set the 5500A to Standby.

4.5.7 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 4-4).
2. Select the following test tool setup:
4-10
range shown under the appropriate column.
•
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.
•
Press to open the SCOPE INPUTS menu.
•
Press to open the TRIGGER menu, and choose:
I
INPUT: B | SCREEN UPDATE:
output, MODE levsin).
The lower transition point is tested in Section 4.5.11.
•
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.
•
Press to open the SCOPE INPUTS menu.
in top of display).
AUTO
anymore!
I
FREE RUN | AUTO RANGE:
Note
in top of display).
AUTO
anymore!
I
>15HZ