Lake Shore 370 Manuals

Lake Shore 370 Manuals

Manuals and User Guides for Lake Shore 370. We have 1 Lake Shore 370 manual available for free PDF download: User Manual

Lake Shore 370 User Manual

Lake Shore 370 User Manual (184 pages)

AC Resistance Bridge

Brand: Lake Shore | Category: Laboratory Equipment | Size: 5 MB

Table of Contents

Table of Contents
5
Figure No.

11
Chapter/Paragraph

11
Introduction

11
- General
  11
- Model 370 Front Panel
  11
  - Description
    12
  - Sensor Performance
    15
  - Specifications
    19
  - Safety Summary
    21
  - Safety Symbols
    21
Background

23
- General
  23
- Useful Temperature Range
  23
- Temperature Scales
  23
- Cryogenic Cooling System Terminology
  23
- Dilution Refrigerator Terminology
  24
- Dilution Refrigerator Block Diagram
  24
  - He Cryostat
    25
- He Cryostat Block Diagram
  25
  - Adiabatic Demagnetization Refrigerator (ADR)
    26
- Single-Stage ADR Block Diagram
  26
  - Model 370 Theory of Operation
    27
  - Why Is the Model 370 Called a Bridge
    27
  - Resistance Measurement
    27
  - Excitation Modes
    28
  - Resistance Ranges
    28
  - Measurement Circuit
    28
  - Shielding and Grounding Theory
    29
  - Shields
    29
  - Electrical Isolation
    29
  - Driven Guards
    29
  - Active Common Mode Reduction
    30
  - Matched Impedance Current Source
    30
  - Measurement Speed and Filtering
    30
  - Noise Sources
    31
  - Induced Electrical Noise
    31
  - Ground Loop Noise
    31
  - Analog Circuit Noise
    31
  - Digital Circuit Noise
    31
  - Resistor Thermal Noise
    32
  - Interference between Two Model 370S
    32
  - Vibration Noise
    32
  - Measurement Error
    32
  - Warm up and Temperature Drift
    32
  - Resistor Installation
    32
  - Resistor Self-Heating and Thermal Resistance
    33
  - Lead Resistance
    33
  - Current Leakage
    33
  - Cable Capacitance
    33
  - Instrument Operation
    34
  - Operating Tradeoffs
    34
  - Resistor Self-Heating Vs. Excitation
    34
  - Excitation Vs. Signal-To-Noise
    35
  - Signal-To-Noise Vs. Measurement Bandwidth
    35
  - MODEL 3716/L and 3708 SCANNER
    35
  - Scanner Performance
    36
  - Controlling Temperature While Scanning
    36
  - Temperature Measurement
    36
  - Sensor Selection
    36
  - Sensitivity
    36
  - Temperature Range
    37
  - Temperature Resolution
    37
  - Accuracy
    37
  - Packaging
    37
  - Environment
    37
  - Sensor Calibration
    38
  - Sensor Installation
    38
  - Mounting Materials
    38
  - Sensor Location
    38
  - Thermal Conductivity
    38
  - Contact Area
    39
  - Contact Pressure
    39
  - Lead Wire
    39
  - Lead Soldering
    39
  - Heat Sinking Leads
    39
  - Thermal Radiation
    39
  - 2.10 Temperature Control
    39
  - 2.10.1 Considerations for Good Control
    40
  - Thermal Conductivity
    40
  - Thermal Lag
    40
  - Two-Sensor Approach
    40
  - Thermal Mass
    40
  - System Nonlinearity
    40
  - Closed Loop PID Control
    41
  - Proportional (P)
    41
  - Integral (I)
    41
  - Derivative (D)
    41
  - Manual Output
    41
Chapter/Paragraph

36
- Examples of PID Control
  42
  - Tuning a Closed Loop PID Controller
    43
  - Setting Heater Range
    43
  - Tuning Proportional
    43
  - Tuning Integral
    44
  - Tuning Derivative
    44
Installation

45
- General
  45
- Inspection and Unpacking
  45
- Rear Panel Definition
  46
- Model 370 Rear Panel
  46
  - Line Input Assembly
    47
  - Line Voltage
    47
  - Line Fuse and Fuse Holder
    47
  - Power Cord
    47
  - Power Switch
    47
  - Resistor Input Connection and Cabling
    48
  - Resistor Input Connector Definition
    48
  - Shielding and Twisting
    48
- Resistance Input Connectors
  48
- Twisted Shielded Cables
  48
  - Driven Guards
    49
  - Isolation and Grounding
    49
- Guarded Shielded Cables
  49
  - Dressing Cables
    50
- Example of Instrument Grounding
  50
- Model 3716 Scanner Front and Rear Panels
  51
Chapter/Paragraph

52
- SCAN CONTROL Signals Without a Scanner
  55
  - Monitor and Reference Outputs
    56
  - Monitor Voltage Output
    56
  - Reference Voltage Output
    56
  - Control Heater Output
    56
  - Heater Output Isolation
    56
- Monitor and Reference Connectors
  56
- Control Heater Output Connector
  56
- Analog Output Connectors
  58
  - Relay Connection
    59
  - 3.10 Rack Mounting
    59
- Alarm Relays Terminal Block
  59
- Model RM-1 Rack Mount Kit Assembly
  59
Operation

61
- General
  61
- Turning Power on
  61
- Display Definition
  61
- Model 370 Display
  61
  - Reading Display
    62
  - Display Update Indicator
    62
  - Range, Excitation and Power
    62
  - Display and LED Annunciators
    62
  - Temperature Control Display
    63
  - Kepad Definition
    63
  - Key Descriptions
    63
  - General Keypad Operation
    64
  - Display Setup
    64
  - Display Setup and Units Selection
    64
  - Display Resolution: 6
    66
  - Display Brightness
    66
  - Excitation Modes, Resistance Range, and Autorange
    66
  - Voltage Excitation Mode
    67
  - Current Excitation Mode
    68
  - Turning Excitation off
    68
  - Input Setup
    68
  - Channel Selection
    69
  - Scanner Dwell Time
    69
  - Change Pause Time
    69
  - Selecting a Temperature Response Curve
    70
  - Temperature Coefficient
    70
  - Turning a Channel on or off
    70
  - Instrument Setup
    71
  - Frequency Selection
    71
  - Active Common Mode Reduction
    71
  - Guard Drive
    71
  - Monitor Output Selection
    72
  - Range and Excitation Keys for One or All Channels
    72
  - Channel on or off
    72
  - Manual Scanner Channel Selection
    73
  - Automatic Scanning
    73
  - Settings for Multiple Channels
    73
  - Firmware Filter
    73
  - 4.10 Temperature Measurement
    75
  - Curve Selection
    75
  - Temperature Display
    75
  - 4.11 Temperature Control
    75
  - Temperature Control Modes
    75
  - Control Setup
    76
  - Setting Control Mode
    76
  - Control Channel: 1
    76
  - Setpoint Units
    77
  - Setpoint Change Pause Time
    77
  - Control Filter
    77
  - Heater Output Display
    78
  - Heater Resistance: 100.00
    78
  - Heater Range Limit
    78
  - Heater Polarity
    79
  - Changing Setpoint
    79
  - Manually Setting PID Values
    80
  - Manually Setting Proportional (P)
    80
  - Manually Setting Integral (I)
    80
  - Manually Setting Derivative (D)
    80
  - Manual Heater Output
    81
  - Heater Output Range and Heater Output off
    81
  - Setpoint Ramp
    82
  - Controlling and Scanning
    83
  - Reading Sequence
    83
  - Settling Time
    83
  - 4.12 Max/Min Capture
    83
  - Linear Equation (Δr)
    84
  - 4.14 Alarms
    86
Chapter/Paragraph

72
- Deadband Example
  86
  - 4.15 Relays
    89
  - 4.16 Analog Outputs
    90
  - 4.17 Still Output
    92
- Unipolar Versus Bipolar Analog Output
  92
  - 4.18 Locking the Keypad
    93
  - 4.19 Default Parameter Values
    93
Advanced Operation

95
- General
  95
- Curve Numbers and Storage
  95
- Curve Header Parameters
  95
- Curve Breakpoints
  95
- Calcurve
  96
- Front Panel Curve Entry Operations
  96
- Edit Curve
  96
- Erase Curve
  99
- Copy Curve
  100
- Zone Tuning
  101
- Entering Zone Parameter Values
  101
- Using Zone Tuning
  104
- Record of Zone Settings
  105
Chapter/Paragraph

107
Computer Interface Operation

107
- General
  107
- Ieee-488 Interface
  107
- Changing IEEE-488 Interface Parameters
  107
- Remote/Local Operation
  108
- IEEE-488 Command Structure
  108
- Status Registers
  110
- Status Byte Register and Service Request Enable Register
  110
- Standard Event Status Register and Standard Event Status Enable Register
  110
- IEEE Interface Example Programs
  111
- IEEE-488 Interface Board Installation for Visual Basic Program
  111
- DEV 12 Device Template Configuration
  112
  - Visual Basic IEEE-488 Interface Program Setup
    113
  - Program Operation
    116
  - Troubleshooting
    116
  - Serial Interface Overview
    117
  - Changing Baud Rate
    117
  - Physical Connection
    117
  - Hardware Support
    118
  - Character Format
    118
  - Message Strings
    119
  - Message Flow Control
    119
  - Serial Interface Example Programs
    119
  - Visual Basic Serial Interface Program Setup
    120
  - Program Operation
    123
  - Troubleshooting
    123
  - Command Summary
    124
  - Interface Commands
    126
Options and Accessories

143
- General
  143
- Models
  143
- Options
  144
- Accessories
  144
- Model 112-374 Cable Assembly
  146
Service

147
- General
  147
- Contacting Lake Shore Cryotronics
  147
- Returning Products to Lake Shore
  147
- Fuse Drawer
  148
- Line Voltage Selection
  148
- Power Fuse Access
  148
  - Fuse Replacement
    149
  - Error Messages
    149
  - Troubleshooting
    150
  - Enclosure Top Removal and Replacement
    154
- Signal Flow Block Diagram
  154
  - Electrostatic Discharge
    155
  - 8.10 Firmware Replacement
    155
- Location of Important Internal Components
  156
  - 8.11 Connector and Cable Definitions
    157
- SCAN CONTROL Connector Details
  157
- Resistor Sensor INPUT Connectors
  158
- REFERENCE and MONITOR Connector Details
  158
- HEATER OUTPUT Connector Details
  158
- ANALOG out 1 and 2 (STILL) Connector Details
  158
- ALARM RELAYS Terminal Block
  159
- IEEE-488 Rear Panel Connector Details
  161
  - 8.12 Model 370 Calibration
    162
Appendix A - Glossary of Terminology

173
Appendix B - Temperature Scales

181
- Temperature Scale Comparison
  181
Appendix C - Handling of Liquid Helium and Nitrogen

183
- Typical Cryogenic Storage Dewar
  183

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