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LIST OF FIGURES
Figure Page
2-1 Agilent 6625A, 6826A, 6628A and 6629A Multiple Output Power Supplies, Block Diagram ……………………………...2-2
2-2 Output Operating Ranges for Agilent Models 6625A, 6626A, 6628A and 6629A …………………………………………2-3
2-2 HP-IB Board, Block Diagram ……………………………………………………………………………………………………..2-6
2-4 Output Board, Secondary Interface Circuits, Block Diagram ………………………………………………………………….2-9
2-5 Output Board, Power Mesh and Control Circuits, Block …………………………………………………………………….2-12
2-6 Voltage and Current Control Circuits, Simplified Schematic ………………………………………………………………..2-13
2-7 Typical Output Range Characteristics ………………………………………………………………………………………….2-14
2-8 Typical Downprogramming Characteristics Below 2.0 V …………………………………………………………………….2-16
2-9 Overvoltage Protection Circuits, Block Diagram ……………………………………………………………………………...2-17
3-1 Operating Ranges Available in Models 6625A, 6626A, 6820A and 6629A …………………………………………………..3-3
3-2 Current Monitoring Resistor Setup ………………………………………………………………………………………………3-4
3-3 Basic Test Setup …………………………………………………………………………………………………………………….3-5
3-4 Transient Recovery Time Test Setup …………………………………………………………………………………………….3-6
3-5 Transient Response Waveform. …………………………………………………………………………………………………..3-7
3-6 Negative Current Limit (- CC) Readback Accuracy ……………………………………………………………………………3-9
3-7 Down Programming Speed Test Setup ………………………………………………………………………………………3-12
3-8 CV Down Programming Speed Test Waveform ………………………………………………………………………………3-13
3-9 CV Up Programming Speed Test Setup ………………………………………………………………………………………..3-13
3-10 CV Up Programming Test Waveform ………………………………………………………………………………………….3-14
3-11 Fixed OV Protection Test Setup …………………………………………………………………………………………………3-14
3-I2 OV External Trip Test Connection ……………………………………………………………………………………………3-14
4-1 Agilent 6625A, 6626A, 6628A and 6629A Multiple Output Supplies, Assembly Locations ……………………………….4-3
4-2 HP-IB, Board, Fuse and Test Point Locations …………………………………………………………………………………...4-6
4-3 Output Board 1 and 2 Fuse and Test Point Locations ………………………………………………………………………….4-7
4-4 Output Board 3 and 4 Fuse and Test Point Locations ………………………………………………………………………….4-9
4-5 Initial Troubleshooting and Board Isolation …………………………………………………………………………………..4-13
4-6 HP-IB Board and Front Panel Troubleshooting ……………………………………………………………………………….4-15
4-7 Signature Analysis Test Setup ………………………………………………………………………………………………….4-17
4-8 Output Board Troubleshooting …………………………………………………………………………………………………4-29
4-9 Output Board Waveform During Self Exercise Routine ……………………………………………………………………4-35
4-10 DAC/Amplifier Circuit Troubleshooting ……………………………………………………………………………………...4-36
4-11 Overvoltage Troubleshooting …………………………………………………………………………………………………4-37
4-12 Output Held Low Troubleshooting ……………………………………………………………………………………………..4-39
4-13 Output Held High Troubleshooting …………………………………………………………………………………………….4-42
4-14 OV Circuit Will Not Trip Troubleshooting ……………………………………………………………………………………..4-43
4-15 Signal Processor U327, Overvoltage Circuit, Simplified Schematic …………………………………………………………4-46
4-16 Signal processor U327, Power-On/Start-Up Circuit, Simplified Schematic ………………………………………………4-46
4-17 Signal processor U327, Status Monitor Circuit, Simplified Schematic ………………………………………………………4-52
4-18 Status Problems Troubleshooting ……………………………………………………………………………………………….4-53
6-1 Power Distribution Schematic ….…………………………………………………………………………………………………6-3
6-2 GPIB Board, Component Location ……………………………………………………………………………………………….6-5
6-2 GPIB Board, Schematic Diagram ...……………………………………………………………………………………………….6-6
6-3 Output 1 & 2 Board, Component Location ..…………………………………………………………………………………..…6-7
6-3 Output 1 & 2 Board, Schematic Diagram .....…………………………………………………………………………………..…6-8
6-4 Output 3 & 4 Board, Component Location ..……………………………………….…………………………………………..6-13
6-4 Output 3 & 4 Board, Schematic Diagram .………………………………………….…………………………………………..6-14
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