Document Outline

• Cover Page
• Declaration of Conformity
• Configuration
• Table of Contents
• List of Figures
• List of Tables
• Foreword
  • Purpose and Scope
  • Contents of This Manual
  • Applicable Hardware
  • General Precautions
    • Cryogen Safety
    • Magnet Quenches
  • Safety Summary
    • Recommended Safety Equipment
    • Safety Legend
• 1 Introduction
  • 1.1 Model 420 Features
    • 1.1.1 Digitally-Controlled
    • 1.1.2 Superior Resolution and Stability
    • 1.1.3 Intuitive Human-Interface Design
    • 1.1.4 Flexible Design
    • 1.1.5 Standard Remote Interfaces
    • 1.1.6 Programmable Safety Features
  • 1.2 Front Panel Layout
    • Table 1-1. Front Panel Description
  • 1.3 Rear Panel Layout
    • Table 1-2. Rear Panel Description
  • 1.4 Model 420 Specifications @ 25 ˚C
  • 1.5 Operating Characteristics
    • Figure 1-1. The four regions, or quadrants, of system operation.
    • 1.5.1 Single-Quadrant Operation
    • Figure 1-2. Single-Quadrant Magnet System
    • 1.5.2 Dual-Quadrant Operation
    • Figure 1-3. Dual-Quadrant Magnet System
    • 1.5.3 Simulated Four-Quadrant Operation
    • Figure 1-4. Simulated Four-Quadrant Magnet System
    • 1.5.4 True Four-Quadrant Operation
    • Figure 1-5. True Four-Quadrant System
• 2 Installation
  • 2.1 Inspecting and Unpacking
  • 2.2 Model 420 Mounting
  • 2.3 Power Requirements
  • 2.4 Collecting Necessary Information
  • 2.5 System Interconnects
    • 2.5.1 Unipolar Supply without Energy Absorber
    • Figure 2-1. System interconnect diagram for a unipolar supply without an energy absorber.
    • 2.5.2 Unipolar Supply with AMI Model 601 Energy Absorber
    • Figure 2-2. System interconnect diagram for a unipolar supply with an AMI Model 601 Energy Absorber.
    • 2.5.3 Unipolar Supply with AMI Model 600/620 Energy Absorber
    • Figure 2-3. System interconnect diagram for a unipolar supply with an AMI Model 600/620 Energy Absorber.
    • 2.5.4 Unipolar Supply with AMI Model 610/630 Energy Absorber and Current Reversing Switch
    • Figure 2-4. System interconnect diagram for a unipolar supply with an AMI Model 610/630 energy absorber and a current reversing switch.
    • 2.5.5 High-Current Four-Quadrant Supply
    • Figure 2-5. System interconnect diagram for the AMI Model 4Q-05100 power supply.
    • 2.5.6 Low-Current, High-Resolution Four-Quadrant Supply
    • Figure 2-6. System interconnect diagram for the Kepco BOP series power supply.
    • 2.5.7 Third-Party Power Supplies
  • 2.6 Special Configurations
    • 2.6.1 Superconducting Magnets without a Persistent Switch
    • Figure 2-7. Illustration of stabilizing resistor in parallel with the magnet.
    • 2.6.2 Short-Circuit or Resistive Load
  • 2.7 Power-Up and Test Procedure
• 3 Operation
  • 3.1 Default Display Modes
    • Figure 3-1. Default display modes.
    • Table 3-1. Description of ramping mode characters.
    • 3.1.1 Entering Numerical Values
    • 3.1.2 Menu Option Selection
    • 3.1.3 Exiting Menus
  • 3.2 Setup Menu Descriptions
    • Figure 3-2. Setup menu, submenus, and parameter diagram.
    • 3.2.1 Supply Setup Submenu
      • 3.2.1.1 Select Power Supply
    • Table 3-2. Available Select Power Supply options.
    • Figure 3-3. Example power supply operating ranges.
      • 3.2.1.2 Min Output Voltage
      • 3.2.1.3 Max Output Voltage
      • 3.2.1.4 Min Output Current
      • 3.2.1.5 Max Output Current
      • 3.2.1.6 V-V Mode Input Range
    • Table 3-3. Predefined voltage-to-voltage mode input range ranges.
    • 3.2.2 Load Setup Submenu
      • 3.2.2.1 Stability Setting
      • 3.2.2.2 Coil Constant
      • 3.2.2.3 Current Limit
    • Figure 3-4. Example limits setup.
      • 3.2.2.4 Persistent Switch Installed
      • 3.2.2.5 Persistent Switch Current
      • 3.2.2.6 Persistent Switch Heated Time
      • 3.2.2.7 Enable Quench Detect
      • 3.2.2.8 Energy Absorber Present
    • 3.2.3 Misc Setup Submenu
      • 3.2.3.1 Display Contrast
      • 3.2.3.2 Ramp Rate Time Units
      • 3.2.3.3 Field Units
    • 3.2.4 Comm Setup Submenu
      • 3.2.4.1 IEEE-488 Address
      • 3.2.4.2 Serial Baud Rate
      • 3.2.4.3 Serial Data Bits/Parity
      • 3.2.4.4 Serial Stop Bits
      • 3.2.4.5 Serial Handshaking
    • 3.2.5 Example Setup
    • Figure 3-5. Example magnet specification sheet.
    • Table 3-4. Example Setup Configuration
  • 3.3 Ramping Functions
    • 3.3.1 Ramping States and Controls
    • Table 3-5. Ramping states and descriptions.
      • 3.3.1.1 Voltage Limit
      • 3.3.1.2 Ramp Rate
    • 3.3.2 Ramping in Manual Mode
    • 3.3.3 Ramping in Programmed Mode
      • 3.3.3.1 Programmed Current/Field
    • 3.3.4 Ramp to Zero Mode
    • 3.3.5 Dial Adjustment of Current/Field in PAUSED Mode
    • 3.3.6 Ramping Functions Example
    • Figure 3-6. Example of ramping to two different programmed current settings.
  • 3.4 Persistent Switch Heater Control
    • 3.4.1 Procedure for Entering Persistent Mode
    • 3.4.2 Procedure for Exiting Persistent Mode
    • 3.4.3 Optional Switching of External Power Supply
  • 3.5 Quench Detection
    • 3.5.1 Disabling Automatic Quench Detection
  • 3.6 Summary of Operational Limits and Default Settings
    • Table 3-6. Summary of limits and defaults for the Model 420.
• 4 Remote Interface Reference
  • 4.1 SCPI Command Summary
  • 4.2 Programming Overview
    • 4.2.1 SCPI Language Introduction
    • 4.2.2 SCPI Status System
    • Figure 4-1. The Model 420 status system.
      • 4.2.2.1 Status Byte Register
    • Table 4-1. Bit definitions for the Status Byte register.
      • 4.2.2.2 Serial Polling and the Service Request (SRQ)
      • 4.2.2.3 Reading the Status Byte using *STB?
      • 4.2.2.4 Using the Message Available Bit(s)
    • 4.2.3 Standard Event Register
    • Table 4-2. Bit definitions for the Standard Event register.
    • 4.2.4 Command Handshaking
      • 4.2.4.1 Using the *OPC Command
      • 4.2.4.2 Using the *OPC? Query
  • 4.3 RS-232/422 Configuration
    • 4.3.1 Serial Port Connector
    • 4.3.2 Termination Characters
    • 4.3.3 Flow Control Modes
  • 4.4 IEEE-488 Configuration
    • 4.4.1 Termination Characters
    • 4.4.2 Device Clear
    • 4.4.3 Trigger Command
  • 4.5 Command Reference
    • 4.5.1 System-Related Commands
    • Figure 4-2. Illustration of asterisk annunciator indicating the Model 420 is in remote mode (all front panel controls are disabled).
    • 4.5.2 Status System Commands
    • 4.5.3 SETUP Configuration Commands and Queries
    • Table 4-3. Return values and their meanings for the SUPPly:TYPE? query.
    • Table 4-4. Return values and their meanings for the SUPPly:MODE? query.
    • 4.5.4 Ramp Configuration Commands and Queries
    • 4.5.5 Ramping State Commands and Queries
    • Table 4-5. Return values and their meanings for the STATE? query.
    • 4.5.6 Switch Heater Commands and Queries
    • 4.5.7 Quench State Control and Queries
    • 4.5.8 Trigger Functions
      • 4.5.8.1 Description of the Trigger Functions
    • Table 4-6. Bit definitions for the Model 420 trigger functions.
      • 4.5.8.2 Trigger Commands and Queries
  • 4.6 Error Messages
    • 4.6.1 Command Errors
    • 4.6.2 Query Errors
    • 4.6.3 Execution Errors
    • 4.6.4 Device Errors
• 5 Service
  • 5.1 Model 420 Maintenance
  • 5.2 Model 420 Troubleshooting Hints
  • 5.3 Additional Technical Support
  • 5.4 Return Authorization
• Appendix
  • A.1 Magnet Station Connectors
    • Table A-1. Connectors J7A and J7B pin definitions.
  • A.2 Auxiliary LHe Level/Temperature Connectors
    • Table A-2. Connectors J8A and J8B pin definitions.
  • A.3 Current Shunt Terminals
  • A.4 Program Out BNC Connector
  • A.5 Quench I/O Connector
    • Table A-3. Connector J4 pin definitions.
    • Figure A-1. Example external circuitry for quench input/output.
  • A.6 IEEE-488 Connector
    • Table A-4. IEEE-488 female connector J11 description.
  • A.7 RS-232/422 Connector
    • Table A-5. PC-to-Model 420 connections for RS-232 operation.
    • Table A-6. PC (DB-9)-to-Model 420 connections for RS-232 operation.
    • Table A-7. EIA-530 Device-to-Model 420 connections for RS-422 operation.
• Index
  • A
  • B
  • C
  • D
  • E
  • F
  • I
  • K
  • L
  • M
  • N
  • O
  • P
  • Q
  • R
  • S
  • T
  • V