Fluke 5720A service manual Wideband Output Flatness Test

5700A/5720A Series II Calibrator

Service Manual

Table 3-12. Wideband Adjustment Tolerance

5700A/5720A Series II Wideband

Output

2.10000V

1.00000V

300.000 mV

100.000 mV

30.0000 mV

10.0000 mV

3.00000 mV

1000.00 μV

5790A Adjustment Counts

±ppm

20

10

3

10

3

1

1

1

3-29. Wideband Output Flatness Test

Use Table 3-32 as a test record. To perform wideband output flatness test, proceed as follows:

1.Connect the equipment as shown in Figure 3-17. Note that the Calibrator wideband cable is connected to the 5790A directly, the termination is not used.

Calibrator (UUT)

Wideband

Output

Wideband

Output Cable

5790A

Wideband

Input

F3-13.EPS

Figure 3-17. Wideband Flatness Test Setup

2.Set the wideband output to 3V at 1 kHz.

3.Push the WBND button on the 5790A, when the reading has settled, push the SET REF soft key.

4.Set the Calibrator to frequencies shown in Table 3-32 for the 3V output and record the errors on the 5790A error display at each frequency in Table 3-32.

5.Verify that the error readings are within spec limits or reduced spec limits shown on the test record. Reduced spec limits are used when the TUR (Test Uncertainty Ratio) is less than 4:1.

6.Repeat steps 4 and 5 for the remaining output levels shown in Table 3-32 using the appropriate voltage in step 4.

7.Record the 1 kHz absolute errors at each output level from Table 3-32 into the appropriate column in Table 3-33. Record the flatness errors from Table 3-32 for each output level and frequency into the appropriate column in Table 3-33. Add the errors and verify that they are within spec for the appropriate time internal.

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