Fluke 123B/S Service Manual - Page 68

Input B Frequency Response Upper Transition Point Test

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123/124 Service Manual Figure 4-4. Test Tool Input B to 5500A Scope Output 50Ω ST8005.WMF 2. Select the following test tool setup: • Press select auto ranging (AUTO in top of display). • Press to open the INPUT B MEASUREMENTS menu, and choose: INPUT B: I ON | MEASURE on B: I Hz • Press to open the SCOPE INPUTS menu. • Press to open the TRIGGER menu, and choose: INPUT: I B | SCREEN UPDATE: I FREE RUN | AUTO RANGE: I >15HZ 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 B main reading on the test tool and check to see if it is within the range shown under the appropriate column. 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: • 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. • Press • Press to open the SCOPE INPUTS menu. to open the TRIGGER menu, and choose: 4-10

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123/124
Service Manual
4-10
ST8005.WMF
Figure 4-4. Test Tool Input B to 5500A Scope Output 50
Ω
2.
Select the following test tool setup:
•
Press
select auto ranging (
AUTO
in top of display).
•
Press
to
open
the INPUT B MEASUREMENTS menu, and choose:
INPUT B:
■
ON | MEASURE on B:
■
Hz
•
Press
to open the SCOPE INPUTS menu.
•
Press
to open the TRIGGER menu, and choose:
INPUT:
■
B | SCREEN UPDATE:
■
FREE RUN | AUTO RANGE:
■
>15HZ
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 B main reading on the test tool and check to see if it is within the
range shown under the appropriate column.
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:
•
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.
•
Press
to open the SCOPE INPUTS menu.
•
Press
to open the TRIGGER menu, and choose: