Fluke 5220A 4-29. Calibration Adjustments

5220A

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 af ter rep ai r of the 5220A and/or when the unit fails the per for man ce-te s t

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.

Contents

Main Page Table of Contents 5220A Page Page List of Tables Page List of Figures 5220A Page Page Section 1 Introduction and Specifications 1-1. Introduction 1-2 1-2. Specifications Specifications for the Model 5220A are given in Table 1-2. Introduction and Specifications Specifications 1-3 1-4 Page Page Section 2 Operating Instructions 2-1. Introduction 2-2. Shipping Information 2-3. Input Power 2-4. Fuse Replacement 2-5. AC Line Fuse 2-6. Power Supply Fuses 2-7. Rack Installation 2-8. Operating Features Page 5220A 2-4 2-9. Operating Notes 2-10. AC Line Connection 2-11. Transconductance Amplifier 2-12. Input Voltage Requirements 2-13. Input Voltage Selection, Front/ Rear 2-14. Current Output, Front/Rear 2-15. Standby/Operate 2-16. Local/Remote 2-17. Status Indicators 2-18. Audible Output 2-19. Inductive Loads Page 2-20. Operation Page Section 3 Theory of Operation 3-1. Introduction 3-2 . Overall Functi onal Descri ption 3-3. General 3-4. Analog Section Page Page 3-5. Digit al Section 3-6. Circuit Analysis 3-7. Power Supply Page 3-8. Preamplifier 3-9. A6 Driver Page 3-10. A7 Output 3-11. A8 Analog Control 3-12. A9 Front Panel 3-13. A10 Logic 3-14. Reset Logic Page 3-15. Timing Logic 3-16. Standby/Operate Logic 3-17. Local/Remote Logic 3-18. Front/Rear I nput Logic 3-19. Failure Status Logic 3-20. A11 MIS Bus Interface Page Page Section 4 Maintenance 4-1. Introduction WWarning 4-2. Service Information 4-3. General Maintenance 4-4. Cleaning 4-5. Air Filter Maintenance 4-6. Access Information Page 4-7. Internal Components/Assemblies 4-8. Front Panel Removal 4-9. A9 Front Panel PCB Removal 4-10. A2 Transformer Assembly Removal 4-11. A6 Driver and A7 Output Assembly Removal 4-12. A3 Cap Bus Removal 4-13. A12 Shunt Assembly Removal 4-14. Fuse Replacement 4-15. Ac Line Fuse 4-16. Power Supply Fuses 4-17. Line Voltage Selection 4-18. Output Terminal Selection, Front/Rear 4-19. Service Tools 4-20. Performance Test 4-21. Initi al Conditions 4-22. Front Panel Tests 4-23. Zero Output 4-24. DC Accuracy and Line Regulation 4-25. Harmonic Distortion 4-26. Frequency Response 4-27. Overcurrent Trip Test 4-28. Overvoltage Trip Test 4-29. Calibration Adjustments 4-30. Initi al Conditions 4-31. Input Offs et Adjustment 4-32. Driver Offset Adjustment 4-33. Output Bias Adjustment 4-34. DC Accuracy Adjustment 4-35. Frequency Response 4-36. Overcurrent Adjustment 4-37. Overvoltage Adjustment 4-38. Replacement of Selecte d Components 4-39. Resistors R11 and R12 4-40. Resistor R13 4-41. Troubleshooting h Page Page 4-21 4-22 Note The jumper wire must be installed between the enabled output terminals. 4-23 Page 4-25 4-26 Section 5 List of Replaceable Parts 5-1. Introduction 5-2. How to Obtain Parts 5-3 . Manual St atus Information 5-4. Newer Instruments 5-5. Service Centers W Page Page 5-5 5-6 5-7 Page Page Page Page Page Page Page Page Page 5-17 5-18 5-19 Page 5-21 Page 5-23 5-24 Page 5-26 5-27 5-28 h Indicates a static-sensit ive part. Page Page 5-31 Page 5-33 Page Page Page Page 5-38 Note The A12 shunt assembly is a suggested non-repairable assembly. Page 5-40 5-41 Page Section 6 Option and Accessory Information 6-1. Introduction 6-2. Accessories 6-3. Rack Mounting Kit (M08-205-600) Page 6-4. Rack Slide Kit (M00-280-610) 6-5. Precision Y5020A Current Shunt