Fluke 124B/S Service Manual - Page 40

Input B Frequency Measurement Accuracy Test, Therefore the Duty Cycle and Pulse Width

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Fluke 123/124/125 Service Manual 5. Observe the Input A 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. Table 3-1. Input A,B Frequency Measurement Accuracy Test 5500A output, 600 mVpp Input A, B Reading 1 MHz 10 MHz 40 MHz 60 MHz (Fluke 124/125 only) 0.993 to 1.007 MHz 09.88 to 10.12 MHz 38.98 to 41.02 MHz 58.48 to 61.52 MHz Note Duty Cycle and Pulse Width measurements are based on the same principles as Frequency measurements. Therefore the Duty Cycle and Pulse Width measurement function will not be verified separately. 3.5.5 Input B Frequency Measurement Accuracy Test Proceed as follows to test the Input B frequency measurement accuracy: 1. Connect the test tool to the 5500A as shown in Figure 3-4. Figure 3-4. 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: ON | MEASURE on B: Hz • Fluke 123/124: press / to open the SCOPE INPUTS menu. 3-10

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Fluke 123/124/125
Service Manual
3-10
5.
Observe the Input A 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.
Table 3-1. Input A,B Frequency Measurement Accuracy Test
5500A output, 600 mVpp
Input A, B Reading
1 MHz
0.993 to 1.007 MHz
10 MHz
09.88 to 10.12 MHz
40 MHz
38.98 to 41.02 MHz
60 MHz (Fluke 124/125 only)
58.48 to 61.52 MHz
Note
Duty Cycle and Pulse Width measurements are based on the same principles as
Frequency measurements.
Therefore the Duty Cycle and Pulse Width
measurement function will not be verified separately.
3.5.5 Input B Frequency Measurement Accuracy Test
Proceed as follows to test the Input B frequency measurement accuracy:
1.
Connect the test tool to the 5500A as shown in Figure 3-4.
ST8005.WMF
Figure 3-4. 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
•
Fluke 123/124: press
/
to open the SCOPE INPUTS menu.