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Fluke 5220A 4-14. Fuse Replacement 4-15. Ac Line Fuse, 4-16. Power Supply Fuses, 4-17. Line Voltage Selection

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5220A

Instruction Manual

4-6

4-14. Fuse Replacement

4-15. Ac Line Fuse

The ac line fuse is accessible by way of a rear-panel fuse holder located to the left of the

input power connector. If fuse replacement is required, disconnect the 5220A from line

power and remove the fuse cap and fuse (twist the fuse cap ccw using a screwdriver).

Select and install a replacement fuse whose rating is compatible with the local line

voltage.

• 100 to 120 V ac: Use fuse type MDA 3 A

• 220 to 240 V ac: Use fuse type MDX 1.5 A

4-16. Power Supply Fuses

There are six fuses located inside of the 5220A. Each is used to fuse one of the secondary

windings of the power transformer. Four of the fuses are located on the A2 Transformer

Assembly, and two are on the A3 Cap Bus. Their locations (F2 through F7) are shown in

Figure 4-1. Use the following procedure when replacement is necessary:

1. Disconnect the 5220A from line power.

2. Remove the top and large inner covers from the 5220A.

3. With reference to Figure 4-1, locate and inspect fuses F2 through F7. The fuses are

installed in fuse clips and can be pulled out using your fingers.

4. Replace defective fuses with the appropriate type and rating:

a. F2 and F3 are AGC 20 A fuses.

b. F4 through F7 are MDL 1/2 A fuses.

4-17. Line Voltage Selection

The 5220A is set at the factory to operate at a line voltage of either 115 or 230 V ac

+10%, 40 to 60 Hz. The selected voltage is identified on a rear panel decal. If your local

line voltage is not within this preset range, a suitable range may be selected by setting a

series of three switches (S1, S2, S3) on the A1 Transformer Assembly. Figure 4-2 shows

the switch locations as well as the switch settings for eight different line voltages. Use the

following procedure to set the line voltage switches:

1. Disconnect the 5220A from line power.

2. Remove both the top cover and the large inner cover from the 5220A.

3. With reference to Figure 4-2, locate and set switches S1, S2, and S3 to the positions

indicated for the desired line voltage.

4. Reinstall the top and inner covers.

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