Fluke 5720A service manual DC Voltage Linearity Test, DC Voltage Output Noise 10 Hz to 10 kHz Test

Calibration and Verification 3

Optional Tests

3.Repeat load regulation testing at the remaining Calibrator outputs shown in Table 3-47.

4.Set the Calibrator to standby and disconnect all equipment from the Calibrator.

3-33. DC Voltage Linearity Test

Use Table 3-35 for a test record. Proceed as follows to test the dc voltage linearity:

1.Self calibrate the Kelvin-Varley (KV) divider as called for in its service manual.

2.Connect the equipment as shown in Figure 3-18.

732B

10V

HI

LO

GRD

720A

INPUT OUTPUT

HIHI

LOLO

GNDGND

NULL DETECTOR

HI

LO GND*

GRD

CALIBRATOR (UUT)

OUTPUT SENSE

HIHI

LOLO

GRD GND

*NOTE: IF THE NULL DETECTOR IS NOT GROUNDED THROUGH POWER LINE, CONNECT ITS GROUND TERMINAL

TO THE GROUND TERMINAL ONTHE 5700A.

F3-14.EPS

Figure 3-18. DC Voltage Linearity Test

3.Set the KV dials to zero by using the RANGE LOCK. Set the Calibrator to 0V on the 11V range operate. Note the null detector reading. Press OFFSET on the Calibrator.

4.Set KV dials to 0.999999X and Calibrator for a 10V output.

5.Use the Calibrator output adjustment to obtain a null detector reading equal to the reading noted in step 3. Press SCALE on the Calibrator.

6.For each of the KV settings tabulated in Table 3-36, make the required Kelvin Varley setting, and verify that the null detector reads within the limits shown.

3-34. DC Voltage Output Noise (10 Hz to 10 kHz) Test

Use Table 3-36 for a test record. Proceed as follows to test the dc voltage output noise that falls in the range 10 Hz to 10 kHz:

1. Connect the equipment as shown in Figure 3-19.

3-43