Lake Shore 625, User Manual

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Lake Shore Model 625 Superconducting MPS User’s Manual
ii Table of Contents
TABLE OF CONTENTS (Continued)
Chapter/Paragraph Title Page
4.3 KEYPAD DEFINITION .............................................................................................................................. 4-2
4.3.1 Key Descriptions ................................................................................................................................ 4-2
4.3.2 General Keypad Operation ................................................................................................................ 4-3
4.4 DISPLAY SETUP ...................................................................................................................................... 4-4
4.4.1 Display Mode ..................................................................................................................................... 4-4
4.4.2 Display Remote Voltage Sense ......................................................................................................... 4-4
4.4.3 Display Brightness ............................................................................................................................. 4-5
4.5 SETTING OUTPUT CURRENT ................................................................................................................ 4-5
4.6 CURRENT RAMP RATE .......................................................................................................................... 4-6
4.7 COMPLIANCE VOLTAGE LIMIT .............................................................................................................. 4-7
4.8 ZERO OUTPUT CURRENT ...................................................................................................................... 4-7
4.9 STOP OUTPUT CURRENT ...................................................................................................................... 4-7
4.10 PAUSE OUTPUT CURRENT ................................................................................................................... 4-7
4.11 MAXIMUM SETTING LIMITS ................................................................................................................... 4-7
4.11.1 Maximum Output Current .................................................................................................................. 4-7
4.11.2 Maximum Compliance Voltage Limit .................................................................................................. 4-8
4.11.3 Maximum Current Ramp Rate ........................................................................................................... 4-8
4.12 RAMP SEGMENTS .................................................................................................................................. 4-9
4.13 FIELD CONSTANT ................................................................................................................................. 4-10
4.13.1 Field Constant Units ........................................................................................................................ 4-10
4.13.2 Field Constant Value ....................................................................................................................... 4-10
4.14 PERSISTENT SWITCH HEATER OUTPUT ........................................................................................... 4-10
4.14.1 Persistent Switch Heater Output Enable .......................................................................................... 4-11
4.14.2 Persistent Switch Heater Current Setting ........................................................................................ 4-11
4.14.3 Persistent Switch Heater Delay ....................................................................................................... 4-12
4.14.4 Persistent Mode Ramp Rate ............................................................................................................ 4-12
4.15 PSH ON/OFF .......................................................................................................................................... 4-13
4.16 QUENCH DETECTION ........................................................................................................................... 4-14
4.16.1 Quench Detection Enable ................................................................................................................ 4-14
4.16.2 Current Step Limit ............................................................................................................................ 4-14
4.17 ERROR STATUS DISPLAY .................................................................................................................... 4-15
4.18 EXTERNAL CURRENT PROGRAMMING .............................................................................................. 4-15
4.19 LOCKING THE KEYPAD ........................................................................................................................ 4-16
4.20 INTERFACE ........................................................................................................................................... 4-17
4.20.1 Changing Serial Baud Rate ............................................................................................................. 4-17
4.20.2 Changing IEEE-488 Interface Parameters ....................................................................................... 4-17
4.21 DEFAULT PARAMETER VALUES ......................................................................................................... 4-18
5 COMPUTER INTERFACE OPERATION ................................................................................................................ 5-1
5.0 GENERAL ................................................................................................................................................. 5-1
5.1 IEEE-488 INTERFACE ............................................................................................................................. 5-1
5.1.1 Changing IEEE-488 Interface Parameters ......................................................................................... 5-2
5.1.2 Remote/Local Operation .................................................................................................................... 5-2
5.1.3 IEEE-488 Command Structure .......................................................................................................... 5-2
5.1.3.1 Bus Control Commands ............................................................................................................. 5-3
5.1.3.2 Common Commands .................................................................................................................. 5-3
5.1.3.3 Device Specific Commands ........................................................................................................ 5-3
5.1.3.4 Message Strings ......................................................................................................................... 5-3
5.1.4 Status System ................................................................................................................................... 5-4
5.1.4.1 Overview .................................................................................................................................... 5-4
5.1.4.2 Status Register Sets ................................................................................................................... 5-8
5.1.4.3 Error Status Register Sets .......................................................................................................... 5-9
5.1.4.4 Status Byte and Service Request (SRQ) .................................................................................. 5-12