Agilent Technologies E3631A D-to-A Converter

Chapter 4 Theory of Operation

D-to-A Converter

D-to-A Converter

Referring to the schematic shown on page 129, all reference voltages of power

circu its a re de rive d fro m the inte rnal volt age r efer ence of sy stem DAC U 12 on

the top board. The system DAC track/hold amplifier outputs are used to

provide controllable reference voltages to three power circuits. The system

DAC is programmed and responds to the main controller via internal 3-wire

serial data bus SERCLK, SERRBK, and SERSTB. The system DAC is

mutiplexed to 6 track/hold amplifiers through U13 on the top board. Each

track/hold amplifier is refreshed approximately every 13 msec to maintain its

output setting. Changes to track/hold amplifier outputs are accomplished by

dwelling on that position for an extended period.

Contents

Main Page The Front Panel at a Glance 3 Front-Panel Voltage and Current Settings 5 Display Annunciators To review the display annunciators, hold down key as you turn on the power supply. The Rear Panel at a Glance In This Book Page Page Page Page Page Page Page Performance Specifications Page Supplemental Characteristics Chapter 1 Specifications Supplemental Characteristics 18 Page Page Page Quick Start To prepare the power supply for use Page To check the rated voltages of the power supply Page To check the rated currents of the power supply Page To use the power supply in constant voltage mode Page To use the power supply in constant current mode Page To use the power supply in track mode To store and recall the instrument state Store 1 Store 3 done recall 1 done recall 3 To rack mount the power supply Page Page Page Calibration Procedures Agilent Technologies Calibration Services Calibration Interval Automating Calibration Procedures Recommended Test Equipment Test Considerations Performance Verification Tests Self-Test Performance Verification Tests Measurement Techniques Setup for Most Tests Electronic Load General Measurement Techniques Current-Monitoring Resistor Programming Voltage and Current Values Constant Voltage (CV) Verifications Constant Voltage Test Setup Voltage Programming and Readback Accuracy Page CV Load Regulation CV Line Regulation Normal Mode Voltage Noise (CV Ripple and Noise) Common Mode Current Noise Load Transient Response Time Constant Current (CC) Verifications Constant Current Test Setup Current Programming and Readback Accuracy Page CC Load Regulation CC Line Regulation Normal Mode Current Noise (CC Ripple and Noise) Performance Test Record for Agilent E3631A 59 Performance Test Record for Agilent E3631A CV Performance Test Record Test Description Actual Result Specifications Upper Limit Lower Limit Performance Test Record for Agilent E3631A CC Performance Test Record Test Description Actual Result Specifications Upper Limit Lower Limit Calibration Security Code To Unsecure the Power Supply for Calibration secured 000000 code 003631 code unsecured To Unsecure the Power Supply Without the Security Code Calibration Count Calibration Message General Calibration/Adjustment Procedure cal mode cal setup 1 v lo +0.1 11 1000 v v lo +0.0860 v v hi +5.7000v v hi +5.9990v cal setup 2 i lo +0.100 a i lo +0.099 a i hi +4.750 a i hi +4.999 a cal setup 3 Aborting a Calibration in Progress Calibration Record for Agilent E3631A 72 Calibration Record for Agilent E3631A Step Calibration Description Measurement Mode (DVM) Supply being Adjusted Error Messages Page 75 Calibration Program 76 ...continued 77 ...continued Page Page Theory of Operation Block Diagram Overview Page AC Input and Bias Supplies Floating Logic Page D-to-A Converter A-to-D Converter Power Mesh and Control Page Earth-Referenced Logic Front Panel Page Service Operating Checklist Is the Power Supply Inoperative? Does the Power Supply Fail Self-Test? Types of Service Available Standard Repair Service (worldwide) Express Exchange (U.S.A. only) Repacking for Shipment Electrostatic Discharge (ESD) Precautions Surface Mount Repair To Replace the Power-Line Fuse Troubleshooting Hints Unit is Inoperative Unit Reports Errors 740 to 748 Unit Fails Self-Test Bias Supplies Problems Self-Test Procedures Power-On Self-Test Complete Self-Test Page Page Page Page 104 Replaceable Parts To Order Replaceable Parts 1 2 3 Backdating and Part Changes E3631-60002 Top PCB Assembly Page Page Page Page Page E3631-60003 VFD Assembly 111 E3631-60003 VFD Assembly E3631-60004 Bottom PCB Assembly Page Page Page E3631-60005 Front Frame Assembly 116 E3631-60005 Front Frame Assembly E3631-60005 Power SupplyAssembly Manufacturers List 117 Manufacturers List Page Page Page Page Schematics Page Page Page Page Page Page Page Page Page Page !