Fluke 5720A service manual DC Voltage One-Tenth Scale Linearity Test

Calibration and Verification 3

Full Verification

3-19. DC Voltage One-Tenth Scale Linearity Test

Note

If the result of the previous test at 1V on the 11V range was less than 2.5 μV it is not necessary to perform this test.

This test uses the same equipment as the previous test. Proceed as follows to perform the DC Voltage One-Tenth Scale Linearity Test:

1.Set the reference divider range to 10V. On the voltage reference standard, remove the lead from the 10V high terminal and connect it under the binding post of the low terminal along with the low lead to provide a 0V reference input to the reference divider. Set the Calibrator output for 10V, then activate range lock for the 11V range. Now set the Calibrator to 0V OPERATE.

2.Note the reading on the null detector. Press OFFSET on the Calibrator. Return the lead on the voltage reference to the high output terminal.

3.Set the Calibrator to 10V. Use the Calibrator output adjustment knob to obtain the reading previously noted on the null detector. Press SCALE on the Calibrator.

4.Set the Calibrator to 1V dc. Set the reference divider to the 1V range, and verify that the null detector indicates less than 2.5 μV from the noted reading.

5.Press RESET on the Calibrator. This completes the DC Voltage Calibration Verification testing.

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