Fluke 5220A Bedienungsanleitung PDF herunterladen (Seite 58)

5 220A

Instruction Manual

4-12

4. Increase the ac voltage calibrator output in 1.0V rms increments. The 5220A should

switch to the standby mode at between 20.0 and 24.0 V rms. The OVERCURRENT

LED should also light.

5. Set the ac voltage calibrator output to zero volts.

6. Disconnect the load resistor from the 5220A output terminals.

4-28. Overvoltage Trip Test

The following procedure is used to check the overvoltage trip setting on the 5220A:

1. Connect a 1 ohm ±5 %, 10 W resistor (Dale RH-10) to the enabled (front/rear) output

terminals on the 5220A.

2. Set the output of the 5220A to 3.0000 V rms.

3. Set the 5220A to the operate mode.

4. Increase the ac voltage calibrator output in 0.1 V rms increments. The 5220A should

switch to the standby mode with an input of 3.1 to 3.5 V rms. The OVERVOLTAGE

LED should also light.

5. Set the ac voltage calibrator output to zero volts and disconnect the unit from the

5220A.

6. Remove the 1 ohm, 10 W resistor from the 5220A output terminals.

7. Set the 5220A POWER switch to OFF.

4-29. Calibration Adjustments

The calibration adjustment procedures given in the following paragraphs should be

performed after repair of the 5220A and/or when the unit fails the performance-test

requirements. If the unit will not respond to, or meet the limits of the adjustment

procedures, troubleshooting and repair is indicated. Equipment required for the

calibration adjustments is listed earlier in Table 4-1.

All calibration adjustments are accessible when the top and large inner covers are

removed from the 5220A. Figure 4-1 identifies the location of the assemblies, test points,

and adjustments that must be accessed to complete the calibration adjustment procedures.

To ensure optimum results, the calibration adjustments must be performed at an ambient

temperature of 22 to 24 degrees Celsius, with a relative humidity of less than 85 %. Also

the unit should be allowed to warmup in the operate mode (with the top cover in place)

for at least 30 minutes before starting the adjustment procedures.

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Fluke 5220A Bedienungsanleitung Seite 58