Lakeshore 325 - Page 9

Lake Shore Model 325 Temperature Controller User’s Manual
Table of Contents iii
TABLE OF CONTENTS (Continued)
Chapter/Section Title Page
4.6 TEMPERATURE CONTROL ........................................................................................................... 4-13
4.6.1 Control Loops ............................................................................................................................... 4-13
4.6.2 Control Modes .............................................................................................................................. 4-14
4.6.3 Tuning Modes .............................................................................................................................. 4-14
4.7 CONTROL SETUP .......................................................................................................................... 4-15
4.8 MANUAL TUNING ........................................................................................................................... 4-16
4.8.1 Manually Setting Proportional (P) ................................................................................................ 4-16
4.8.2 Manually Setting Integral (I) ......................................................................................................... 4-17
4.8.3 Manually Setting Derivative (D) .................................................................................................... 4-17
4.8.4 Setting Manual Heater Power (MHP) Output ............................................................................... 4-18
4.9 AUTOTUNE (Closed-Loop PID Control) .......................................................................................... 4-18
4.10 ZONE SETTINGS (Closed-Loop Control Mode).............................................................................. 4-19
4.11 SETPOINT....................................................................................................................................... 4-22
4.12 RAMP .............................................................................................................................................. 4-23
4.13 HEATER RANGE AND HEATER OFF ............................................................................................ 4-24
4.14 HEATER RESISTANCE SETTING .................................................................................................. 4-24
4.15 LOCKING AND UNLOCKING THE KEYPAD .................................................................................. 4-25
4.16 REMOTE/LOCAL ............................................................................................................................ 4-25
4.17 INTERFACE .................................................................................................................................... 4-25
4.18 DEFAULT VALUES ......................................................................................................................... 4-26
5 ADVANCED OPERATION ..................................................................................................................................... 5-1
5.0 GENERAL ......................................................................................................................................... 5-1
5.1 CURVE NUMBERS AND STORAGE ................................................................................................ 5-1
5.1.1 Curve Header Parameters ............................................................................................................. 5-1
5.1.2 Curve Breakpoints ......................................................................................................................... 5-1
5.2 FRONT PANEL CURVE ENTRY OPERATIONS .............................................................................. 5-3
5.2.1 Edit Curve ...................................................................................................................................... 5-3
5.2.1.1 Thermocouple Curve Considerations ......................................................................................... 5-5
5.2.2 Erase Curve ................................................................................................................................... 5-5
5.2.3 Copy Curve .................................................................................................................................... 5-6
5.3 SOFTCAL™ ...................................................................................................................................... 5-6
5.3.1 SoftCal With Silicon Diode Sensors ............................................................................................... 5-7
5.3.2 SoftCal Accuracy With Silicon Diode Sensors ............................................................................... 5-7
5.3.3 SoftCal With Platinum Sensors ...................................................................................................... 5-8
5.3.4 SoftCal Accuracy With Platinum Sensors ...................................................................................... 5-8
5.3.5 SoftCal Calibration Curve Creation ................................................................................................ 5-9
6 COMPUTER INTERFACE OPERATION ................................................................................................................ 6-1
6.0 GENERAL ......................................................................................................................................... 6-1
6.1 IEEE-488 INTERFACE ...................................................................................................................... 6-1
6.1.1 IEEE-488 Interface Parameters ..................................................................................................... 6-1
6.1.2 Remote/Local Operation ................................................................................................................ 6-2
6.1.3 IEEE-488 Command Structure ....................................................................................................... 6-2
6.1.3.1 Bus Control Commands ............................................................................................................. 6-2
6.1.3.2 Common Commands ................................................................................................................. 6-3
6.1.3.3 Device Specific Commands ........................................................................................................ 6-3
6.1.3.4 Message Strings ......................................................................................................................... 6-3
6.1.4 Status System ................................................................................................................................ 6-3
6.1.4.1 Overview .................................................................................................................................... 6-3
6.1.4.2 Status Register Sets ................................................................................................................... 6-6
6.1.4.3 Status Byte and Service Request (SRQ) .................................................................................... 6-7
6.1.5 IEEE Interface Example Programs .............................................................................................. 6-10
6.1.5.1 IEEE-488 Interface Board Installation for Visual Basic Program .............................................. 6-10
6.1.5.2 Visual Basic IEEE-488 Interface Program Setup ...................................................................... 6-10
6.1.5.3 Program Operation ................................................................................................................... 6-14
6.1.6 Troubleshooting ........................................................................................................................... 6-14