Oxford Instruments Mercury iTC

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Handbook

November 2011 / 59-UMC0071 / Issue 01

Mercury iTC

Page 143

GLOSSARY

Original Instructions

GLOSSARY

This glossary explains the acronyms, abbreviations and special terms used in this Instructions for Use

Manual. The entries are presented in alphanumeric order.

Main Page

Table of Contents3
Preface9
Use of this Manual9
Customer Support9
Health and Safety Information10
Intended Users10
Statement of Intended Use of the Mercury Itc10
Typographical Conventions11
Disclaimers11
Copyright Notice11
Acknowledgements12
Acronyms, Abbreviations and Special Terms12
Revision History12
Certification Compliance Statements13
Health and Safety15
Warnings15
Protective Ground15
High Voltage Hazard15
Maintenance and Adjustment16
Restrictions on Use16
Cautions16
Electrostatic Caution16
Cooling Caution17
Solid Waste17
Overview of the Itc19
System Description20
Temperature Sensor Circuits21
Heater Circuits21
Optional Cooling Circuit21
Remote Interfaces21
Display and Touch-Screen21
Electrical Power Supply22
User Interface23
Front and Rear Panel Controls23
LCD Display and GUI23
Using the Touch Screen23
Initiating Actions23
Drop-Down Menus23
Scrolling24
Soft Keypads25
Using Arrows to Adjust Integer Values27
Button Labels27
Common Screen Features28
Home and Apply Buttons28
Home Page28
Channel Summary Panel29
Channel Display Configuration Page30
Device Pair Configuration Page31
Sensor Details32
Temperature Sensor Details Page32
Generic Sensor Adjustment Page33
Level Meter Sensor Details Page34
Plot Configuration Page36
Plot Page37
Adjusting the Plot Scaling37
Control Loop Configuration Page38
Gas Flow Configuration Page40
PID Table Editor Page41
General Settings Tab43
Display Settings Tab44
Card Settings Tab45
RS232 Settings Tab46
Ethernet Settings Tab47
Isobus Settings Tab48
GPIB Settings Tab48
Clock Settings Tab49
Cal Update Settings Tab50
F/W Update Settings Tab51
3.2.12.10 Engmode Tab52
3.2.12.11 Factory Settings Tab53
Alarm Logs Page54
Heater Configuration Page55
Sweep Table Page56
Save File Pages57
Load File58
Functional Description59
Main Components59
User Interface60
Motherboard60
Itc Connections60
Electrical Power Connection60
Temperature Sensor Inputs60
Outputs60
Heater and Sensor Connections61
Connecting Thermocouples61
Communications Interfaces61
Serial RS232 Interface62
Oxford Instruments Nanoscience ISOBUS63
USB Interface63
Ethernet Interface63
Daughter Boards63
Expansion Slots64
Positioning Daughter Boards64
Interconnecting Heater and Temperature-Sensor Boards65
Overview of Temperature Measurement66
Measurement Principles66
Types of Temperature Sensor66
Thermocouples68
Resistance and Diode Sensors68
Calibration for Different Sensors68
Circuit Descriptions69
Temperature Measurement Circuit69
Description of Voltage Measurement Mode69
Description of Constant Current Measurement Mode70
Description of Constant Voltage Measurement Mode71
Calibrating the Temperature Measurement Circuit73
Heater Circuit74
Description of the Heater Circuit74
Calibrating the Heater Circuit75
Getting Started77
Checking the Electrical Supply77
Mounting the Equipment77
Connecting Electrical Power78
Connecting the Heaters and Sensors78
Connecting the Data Interfaces78
Connecting the Ethernet Interface (if Required)78
Connecting the RS232 Serial Interface (if Required)78
Connecting ISOBUS (if Required)78
Connecting the GPIB (if Required)79
Connecting the Auxiliary Port (if Required)79
Connecting the Level-Meter (if Required)79
Powering up the Unit for the First Time80
Setting the Date and Time80
Configuring the Inputs81
Configuring the Sensor Details81
Using a Generic Calibration-File81
Configuring a Heater82
Configuring the Heater Control Loop83
Configuring Manual Heater Control83
Configuring Automatic Heater Control83
Configuring a Gas Valve84
Configuring Manual Control of the Gas Valve84
Configuring Automatic Control of the Gas Valve85
Testing the Inputs and Outputs85
Testing the Temperature Sensor Inputs85
Testing the Heater Output85
Configuring Remote Interfaces85
Basic Operating Instructions87
Configuring the LCD Display87
Changing a Setpoint87
Changing a Heater Setpoint87
Changing a Gas-Flow Setpoint87
Using the Sweep Function87
The Purpose of the Sweep Function87
Programming a Sweep88
Loading a Sweep88
Starting a Sweep88
Stopping a Sweep89
Using the Plot Function89
Configuring a Plot89
To Remove a Trace from the Plot90
To Exit the Plot90
Configuring External Interfaces90
Configuring the Ethernet Interface (if Required)90
Configuring the RS232 Serial Interface (if Required)91
Configuring the GPIB (if Required)91
Configuring the USB Interface (if Required)91
Enabling Remote Control of the Itc91
Enabling Local Control of the Itc92
Re-Configuring Sensors and Heaters92
To Clear a Panel Configuration92
Re-Configuring a Sensor92
Re-Configuring a Heater92
Re-Configuring a Control Loop92
Changing Control-Loop Parameters93
Entering PID Parameters Manually93
Creating a PID Table93
Remote Operation95
Notes on Instrument Addresses95
Communication Protocols for RS232 and GPIB95
Commands and Responses96
Numeric Parameters96
Control Via ISOBUS96
GPIB Interface97
Switching between RS232 and GPIB Operation97
Sending Commands Via the GPIB97
Accepting Responses Via the GPIB98
Status Byte and Use of a Serial Poll98
RQS Bit98
BAV Bit98
MAV Bit98
Status Byte Update Rate99
Use of the Service Request Line99
Use of the Device Clear Function99
Use of the Interface Clear Function99
Non-Implemented Features of the GPIB99
Compatibility with IEEE-488.2100
Writing a Reliable GPIB Control Program100
Timeouts100
Preventive Maintenance101
Six-Monthly Maintenance101
Cleaning the Touch-Screen101
Calibrating the Temperature-Sensor Circuits101
Unscheduled Maintenance101
Troubleshooting103
Fault-Finding Features of the Itc103
The Alarm-Logs103
Troubleshooting Information103
Command Reference Guide105
Nomenclature Used in this Section105
SCPI and Legacy Command Sets105
SCPI Command Messages105
SCPI Protocol Conventions105
Command Structure106
Verbs106
Nouns106
System Commands107
Addressing a Temperature Sensor108
Addressing a Heater Controller110
Addressing a Level Meter Sensor110
Addressing an Auxiliary I/O Daughter Board112
Addressing a Control Loop113
Invalid Responses113
Legacy Command Messages113
Technical Specifications115
Physical Specification115
Electrical Power Supply115
Sensor Inputs115
Heater Outputs116
PC Interfaces116
Electrical Isolation117
Environmental Specifications117
Theory of Control Loops119
General Information on Control Loops119
General Information on Temperature Control Loops119
Open Loop Operation120
On-Off Control120
Proportional Control121
Proportional Control with Integral Action122
Proportional Control with Integral and Derivative Action123
North American Terminology123
PID Tables124
PID Table Operation124
Entering a PID Table124
Theory of Gas-Flow Control125
Overview of Gas Control125
Manual Control of the Gas Flow125
Automatic Control of the Gas Flow125
Heater Target Tables126
Temperature Sensor Daughter Board127
Overview of the Temperature Sensor Board127
Installing a Temperature Sensor Board127
Fitting the Board127
Connecting the Sensor128
Configuring the Temperature Sensor Board128
Heater Daughter Board129
Overview of the Heater Board129
Installing a Heater Board129
Fitting the Board129
Connecting the Heater130
Configuring the Heater Board130
Configuring the Control Loop130
Auxiliary I/O Daughter Board131
Description of the Auxiliary I/O Board131
Auxiliary I/O Board Functions131
Gas-Flow Control Using a Motorised Needle-Valve131
Installing an Auxiliary I/O Board132
Fitting the Board132
Connecting to the Auxiliary I/O Board133
Level-Meter Daughter Board135
Description of the Level-Meter Board135
Principles of Operation135
Operation of the Board with a Helium-Level Probe135
Operation of the Board with a Nitrogen-Level Probe136
Explanation Why Different Methods Are Used for the Two Liquids136
Installing the Level-Meter Board136
Fitting the Board136
Connecting the Sensor137
Configuring the Level-Meter Board138
Configuring a Liquid-Helium Sensor138
Configuring a Liquid-Nitrogen Sensor139
Specification of the Level-Meter Board140
Gpib Daughter Board141
Description of the GPIB Daughter Board141
Installing a GPIB Board141
Fitting the Board141
Connecting to a GPIB Board142
Glossary143
Acronyms and Abbreviations144

Oxford Instruments Mercury iTC - Glossary

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