Fluke 123B/S Service Manual - Page 67

Input A Frequency Measurement Accuracy Test, Therefore the Duty Cycle

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4 Performance Verification 4.5 Input A and Input B Tests Note The lower transition point is tested in Section 4.5.11. 4.5.4 Input A Frequency Measurement Accuracy Test Proceed as follows to test the Input A frequency measurement accuracy: 1. Connect the test tool to the 5500A as for the previous test (see Figure 4-3). 2. Select the following test tool setup: • Press to select auto ranging (AUTO in top of display). • Press to open the INPUT A MEASUREMENTS menu, and choose: MEASURE on A: I Hz 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 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 4-1. 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 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. 4.5.5 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 4-4. 4-9

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Performance Verification
4.5 Input A and Input B Tests
4
4-9
Note
The lower transition point is tested in
Section 4.5.11.
4.5.4 Input A Frequency Measurement Accuracy Test
Proceed as follows to test the Input A frequency measurement accuracy:
1.
Connect the test tool to the 5500A as for the previous test (see Figure 4-3).
2.
Select the following test tool setup:
•
Press
to select auto ranging (
AUTO
in top of display).
•
Press
to open the INPUT A MEASUREMENTS menu, and choose:
MEASURE on A:
■
Hz
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 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 4-1. 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 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.
4.5.5 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 4-4.