Lakeshore 340 - Page 76

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Lake Shore Model 340 Temperature Controller User’s Manual

6-12 Temperature Control Operation

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Declaration of Conformity3
Table of Contents5
Introduction13
- General13
  - Model 340 Front Panel13
- Temperature Control System14
- Temperature Control System with the Model 34014
- Cooling Source14
- Typical Temperature Control System with Model 34014
- Feedback15
- Control Equation15
- Heating15
- Model 340 Features15
- Configurable Inputs15
- Input Isolation16
- Input Reading Capability16
Model 340 Temperature Controller Block Diagram16
- Temperature Response Curves and Calcurves17
- Softcal17
- Configurable Heater Output17
- Heater Output Protection17
- Second Control Loop17
- Autotune17
- Setpoint Ramping and Zones17
- Internal Programming18
- Math18
- Alarms, Analog Outputs, and Digital I/O18
- Memory Card18
- Computer Interface18
Comparison of Control Loops 1 and 218
Model 340 Sensor Performance Chart22
Cooling System Design23
- General23
- Temperature Sensor Selection23
- Temperature Range23
- Sensor Sensitivity23
- Environmental Conditions24
- Measurement Accuracy24
- Sensor Package24
- Calibrated Sensors24
- Traditional Calibration24
- Softcal25
Silicon Diode Sensor Calibrations and Calcurve25
- Standard Curves26
- Calcurve26
- Sensor Installation26
- Mounting Materials26
- Sensor Location26
- Thermal Conductivity27
- Contact Area27
- Contact Pressure27
Typical Sensor Installation in a Mechanical Refrigerator27
- Lead Wire28
- Lead Soldering28
- Heat Sinking Leads28
- Thermal Radiation28
- Heater Selection and Installation28
- Heater Resistance and Power28
- Heater Location29
- Heater Types29
- Heater Wiring29
- Considerations for Good Control29
- Thermal Conductivity29
- Thermal Lag30
- Two-Sensor Approach30
- Thermal Mass30
- System Nonlinearity30
- Pid Control31
- Proportional (P)31
- Integral (I)31
- Derivative (D)31
  - Examples of PID Control32
- Manual Heater Output33
- Manual Tuning33
- Setting Heater Range33
- Tuning Proportional33
- Tuning Integral34
- Tuning Derivative34
- Autotuning35
- Zone Tuning36
- General37
- Receiving the Model 34037
- Inspection and Unpacking37
- Repackaging for Shipment37
- Safety Summary38
- Safety Symbols38
- Handling Liquid Helium and Liquid Nitrogen39
  - Typical Cryogenic Storage Dewar39
  - Comparison of Liquid Helium to Liquid Nitrogen39
- Rear Panel Definition40
  - Model 340 Rear Panel40
- Line Input Assembly41
- Line Voltage and Fuse Verification41
- Line Voltage Selection41
AC Line Input Definitions41
- Fuse Replacement42
- Power Cord42
- Power Switch42
- Standard Sensor Inputs42
- Sensor Input Connector and Pinout42
  - Power Fuse Access42
  - Sensor INPUT a and B Connector Definitions42
- Sensor Lead Cable43
- Grounding and Shielding Sensor Leads43
- Sensor Polarity43
- Four-Lead Sensor Measurement43
- Two-Lead Sensor Measurement44
- Lowering Measurement Noise44
- Heater Output Setup44
- Loop 1 Output44
- Heater Output Connector for Loop 144
- Heater Output Wiring for Loop 145
- Heater Protection and Fuse for Loop 145
- Loop 1 Heater Noise45
- Model 3003 Heater Output Conditioner45
- Loop 2 Output46
- Loop 2 Output Resistance46
- Loop 2 Output Connector46
- Loop 2 Heater Protection46
- Model 3003 Heater Output Conditioner46
- Boosting the Output Power47
- Analog Outputs47
ANALOG out 1 and 2 BNC Rear Panel Connector Details47
- Digital I/O48
- Relays48
Front Panel Operation49
- General49
- Turning Power on49
- Display Formats49
  - Model 340 Front Panel49
- Normal Display50
- Setting Displays50
- Data Entry Displays50
- Error Displays50
- Keypad Description50
- Keypad Navigation51
- Direct Settings51
- Using Setting Screens52
- Data Entry Screens52
- The Help Key52
- Keypad Time-Out52
- Key Definitions53
- Changing Display Format54
- Number of Readings Displayed54
- Sensor Input54
- Reading Source and Display Units55
- Control Loop Display55
- Large Heater Display55
- Heater Output Display Units56
- Display Contrast56
- Display Backlight On/Off56
- Locking the Keypad56
- Default Values56
Sensor Input and Temperature Measurement Operation57
- General57
- Sensor Input Setup57
- Sensor Type57
- Sensor Types Recognized by the Model 34057
- Voltage Excitation (Current Autorange)58
- Thermal EMF Compensation with Voltage Excitation58
- Special Sensor Type Configuration58
- Turning an Input off59
- Selecting a Temperature Response Curve59
- Special Sensor Type Configuration59
- Filter and Math60
- Filter60
- Standard Curve Table60
- Max/Min61
  - Data Flow61
- Linear Equation62
- Scanner Support62
- Scan Modes62
- Linear Equation Configuration62
- Input Setup with a Scan Mode Active63
- Manual Scanning63
- Auto Scanning64
- Slave Scanning64
Temperature Control Operation65
- General65
- Control Loops65
- Control Loops on the Normal Display65
- Loop Indication on the Normal Display65
- Loop Indication on Setting Screens65
- Control Output Display66
- Control Loop Enable66
- Control Loop Filter66
- Control Channel67
- Control Modes67
- Control Mode Description67
- Manual Setting of Pid Control Parameters68
- Proportional (P)68
- Integral (I)68
- Derivative (D)68
- Manual Output68
- Selecting an Autotune Control Mode68
- Zone Control Data Entry69
  - Record of Zone Settings70
- Using Open Loop Control71
- Setting a Setpoint and Setpoint Units71
- Setpoint Ramping72
- Control Output72
- Heater Output Parameter Settings and Heater Range72
Full Scale Heater Power at Typical Resistance73
- Analog Output as Loop 2 Control Output74
- Control Output Limits75
- Setpoint Limit75
- Control Output Slope Limit75
- Heater Range Limit75
Analog Output, Digital I/O. Alarms, and Relay Operation77
- General77
- Analog Outputs77
- Input Mode for Analog Output78
- Example of Low and High Parameter Setting78
- Loop 2 Mode for Analog Output 278
- Manual Mode Operation of the Analog Outputs79
- Digital Inputs and Outputs (I/O)79
- Digital Output Modes79
- Digital Outputs in Alarm Mode79
- Digital Outputs in Scanner Mode79
- Digital Outputs in Manual Mode80
- Digital Input Modes80
- Input Alarms80
- Enabling an Input Alarm80
- Selecting an Input Alarm Source81
- Input Alarm High and Low Settings81
- Input Alarm Latching81
- Input Alarm Relay Setup81
- Input Alarm Reset82
- Audible Beeper82
- High and Low Relays82
- Selecting a Relay Mode82
- Manually Setting a Relay82
Instrument Programming83
- General83
- Curve Entry from the Front Panel83
- Curve Numbers and Storage83
- Front Panel Curve Entry Operations83
- Front Panel Curve Edit84
- Recommended Curve Parameters84
- Front Panel Curve Copy85
- Front Panel Curve Erase85
- Softcal86
- Softcal and Silicon Diode Sensors86
Softcal Temperature Ranges for Silicon Diode Sensors86
- Softcal Accuracy with Silicon Diode Sensors87
- Softcal and Platinum Sensors87
- Softcal Accuracy with Platinum Sensors87
Softcal Temperature Ranges for Platinum Sensors87
- Creating a Softcal Calibration Curve88
- Internal Programming88
- Program Instructions88
- Internal Programming Operations92
- Enter or Edit an Internal Program92
- Saving a Program93
- Summary of Key Operation93
- Example of an Internal Program (Example 1)93
- Example of Using Subprograms (Example 2)94
- Run an Internal Program94
- Stop a Running Program94
  - Sample Program #194
- Clear Internal Program Memory95
- Data Card Operation95
- Data Logging to a Data Card95
- Storage Capability for a 1 MB Data Card95
- Reading from a Data Card98
- Writing to a Data Card98
- Erasing a Data Card98
Remote Operation99
- General99
- Ieee-488 Interface99
- IEEE-488 Interface Settings99
- IEEE-488 Command Structure99
- Status Registers101
- IEEE Interface Example Programs102
- IEEE-488 Interface Board Installation for Visual Basic Program102
  - GPIB Setting Configuration103
DEV 12 Device Template Configuration103
- Visual Basic IEEE-488 Interface Program Setup104
IEEE-488 Interface Program Control Properties105
Visual Basic IEEE-488 Interface Program106
- IEEE-488 Interface Board Installation for Quick Basic Program107
- Quick Basic Program107
Typical National Instruments GPIB Configuration from IBCONF.EXE108
Quick Basic IEEE-488 Interface Program109
- Program Operation110
- Troubleshooting110
- Serial Interface Overview111
- Changing Baud Rate111
- Physical Connection111
  - Serial Interface Connections111
- Hardware Support112
- Character Format112
- Message Strings112
- Serial Interface Specifications112
- Message Flow Control113
- Serial Interface Example Programs113
- Visual Basic Serial Interface Program Setup114
Serial Interface Program Control Properties115
- Visual Basic Serial Interface Program116
- Quick Basic Serial Interface Program Setup117
- Program Operation118
- Troubleshooting118
- Ieee-488/Serial Interface Commands119
Options and Accessories141
- General141
- Options141
- Accessories141
Model 2001 RJ-11 Cable Assembly143
Model 2003 RJ-11 to DE-9 Adapter143
Optional Model 2002 RJ-11 to DB-25 Adapter144
Model 3012 Rack-Mount Kit144
- Model Dual Standard 3462 Input Option Card145
- Field Installation145
Cover and Option Plate Screws145
Model 340 Mounting Holes and Analog Option Plug146
- Operation147
- Specifications147
- Model 3464 Dual Thermocouple Input Option Card147
- General147
Model 340 Rear Panel with Model 3462 Option Card Installed147
- Option Installation148
- Sensor Installation148
- Sensor Input Terminals148
Thermocouple Polarity148
- Measurement Point Connection149
- Grounding and Shielding149
- Operation149
- Default Settings149
- Input Selection149
- Displaying Option Readings149
- Curve Selection150
- Curve Data Format150
- Range Selection150
- Room Temperature Compensation150
Model 340 Rear Panel with Model 3464 Option Card Installed148
Standard Thermocouple Curves150
- Computer Interface Commands151
- Thermocouple Temperature Curves152
- Specifications152
- Model 3465 Single Capacitance Input Option Card152
- Option Installation152
- Sensor Installation152
- Sensor Input Connector152
- Measurement Point Connection152
- Grounding and Shielding152
- Operation153
- Input Selection153
- Displaying Option Readings153
- Curve Selection153
- Range Selection153
- Temperature Coefficient153
- Control Channel Changes153
- Computer Interface Commands153
- Specifications153
- Model 3468 Eight-Channel Input Option Card154
- General154
- Option Installation154
- Sensor Installation154
- Sensor Input Connector154
- Sensor Input Cabling154
- Reading Rate154
- Operation155
- General Operation155
- Input Setup155
- Temperature Control155
- Computer Interface Commands156
- Specifications156
Service159
- General159
- General Maintenance Precautions159
- Electrostatic Discharge159
- General Maintenance160
- Rear Panel Connector Definitions160
SERIAL I/O RJ-11 Rear Panel Connector Details160
DIGITAL I/O DA-15 Rear Panel Connector Details161
RELAYS lo and HI Rear Panel Connector Details161
ANALOG out 1 and 2 BNC Rear Panel Connector Details162
SENSOR INPUT a and B Rear Panel Connector Details162
HEATER OUTPUT Rear Panel Connector Details162
- IEEE-488 Interface Connector163
IEEE-488 Rear Panel Connector Details163
- Serial Interface Cable and Adapters164
Model 2001 RJ-11 Cable Assembly Wiring164
Model 2003 RJ-11 to DE-9 Adapter Wiring Details164
- Top of Enclosure Remove and Replace Procedure165
- Eprom and Novram Replacement165
  - Error Messages166
Location of Internal Components166
- Firmware IC Replacement167
- Updating the Master Firmware from a Data Card169
  - A1.0 General171
  - Appendix A -Curve Tables171

Lakeshore 340 - Page 76

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