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Operation

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4-24

Table of Contents

Table of Contents3
List of Tables6
- List of Figures7
- Section I, Description9
General9
Changes from Previous Versions10
About this Manual10
- Section II, Specifications11
General11
Source Mode11
- Thermocouple Output Mode11
- Voltage Output Mode12
Meter Mode12
Supported Standards12
General Instrument Specifications12
Thermocouple-Accuracy Tables13
- Table 2-1: Type B Thermocouple (°C)14
- Table 2-2: Type B Thermocouple (°F)14
- Table 2-3: Type C Thermocouple (°C)14
- Table 2-4: Type C Thermocouple (°F)14
- Table 2-5: Type D Thermocouple (°C)15
- Table 2-6: Type D Thermocouple (°F)15
- Table 2-7: Type E Thermocouple (°C)15
- Table 2-8: Type E Thermocouple (°F)15
- Table 2-10: Type G Thermocouple (°F)16
- Table 2-11: Type J Thermocouple (°C)16
- Table 2-12: Type J Thermocouple (°F)16
- Table 2-9: Type G Thermocouple (°C)16
- Table 2-13: Type K Thermocouple (°C)17
- Table 2-14: Type K Thermocouple (°F)17
- Table 2-15: Type N Thermocouple (°C)17
- Table 2-16: Type N Thermocouple (°F)17
- Table 2-17: Type Platinel II Thermocouple (°C)18
- Table 2-18: Type Platinel II Thermocouple (°F)18
- Table 2-19: Type R Thermocouple (°C)18
- Table 2-20: Type R Thermocouple (°F)18
- Table 2-21: Type S Thermocouple (°C)19
- Table 2-22: Type S Thermocouple (°F)19
- Table 2-23: Type T Thermocouple (°C)19
- Table 2-24: Type T Thermocouple (°F)19
- Section III, Unpacking and Installation21
Shipment Contents21
Unpacking21
Model 1140A Installation21
Packing for Shipment21
- Section IV, Operation23
General23
Front-Panel Controls23
- Connections23
- Power23
- Figure 4-1: Front View of the Model 1140A23
- Menu Key24
- Enter Key (Operate/Standby)24
- Escape Key24
- Twelve-Key Keypad24
- Four Arrow Keys25
- Encoder (Large Knob)25
Operating Screen Main Display25
- Control25
- Mode26
- Offset26
- Reference-Junction Temperature26
- Material26
- Thermocouple Type26
- Table 4-1: Thermocouple Types in the Model 1140A27
- Message Displays28
Menus30
- Thermocouple Menu30
- Figure 4-2: Main Menu30
- Figure 4-3: Thermocouple Menu30
- Instrument Mode Menu32
- Figure 4-4: Instrument Mode Menu32
- Output Menu33
- Figure 4-5: Output Menu33
- Memory Menu34
- Figure 4-6: Memory Menu with no Saved Files34
- Figure 4-7: Memory Menu with Saved Files34
- Sequence Menu36
- Figure 4-8: Sequence Menu36
- Data Logging Menu and Downloading Data38
- Figure 4-9: Data Logging Menu38
- Display Menu39
- Figure 4-10: Display Menu39
- Remote Menu40
- Figure 4-11: Remote Menu40
- Figure 4-12: Web Browser Using the Ethernet Interface42
- Maintenance Menu43
- Figure 4-13: Maintenance Menu43
- Diagnostics Menu44
- Table 4-2: Default Settings44
- Figure 4-14: Diagnostics Menu44
- Section V, Applications47
General47
Functions47
- Source Mode47
- Meter Mode47
Battery Operation48
Connections48
- Thermocouple Connections48
- Temperature Variation49
Considerations49
- Polarity of Thermocouple Wires49
- Shielding and the Guard Terminals49
- Grounding50
- And IPTS-6850
- Offset50
- Autozero51
- Low Output Impedance51
- Guard Bands52
- Section VI, Remote Operation53
Figure 6-1: Remote Menu53
General53
Remote Menu53
Changing the Active Interface53
Setting the Interface Address (GPIB Only)53
Activating and De-Activating Remote Control53
Table 6-1: Remote Command Summary54
Model 1140A Commands55
- Source-Mode Commands and Queries55
- Meter-Mode Query56
- Thermocouple Commands and Queries56
- Instrument Commands and Queries58
- Output Commands and Queries60
- System Commands and Queries61
- Table 6-2: Model 1140A Error Codes62
- Data Logging Queries63
Model 1120 Remote Emulation Option64
- Background64
- Limitations64
- Model 1120 Remote Control Operation66
- Errors66
- Table 6-3: Model 1120 Remote Commands66
- Section VII, Theory of Operation67
Operating Modes67
- Thermocouple Simulator (Alloy Output)67
- Figure 7-1: Model 1140A Block Diagram67
- Precision Voltage Source (Copper Output)68
- Thermocouple Meter (Alloy Input)68
- Precision Voltmeter (Copper Input)68
- Thermocouple Simulator (Copper Output)68
- Thermocouple Meter (Copper Input)68
- Precision Voltage Source (Alloy Output)69
- Precision Voltmeter (Alloy Input)69
- Thermocouple Offset69
Hardware Implementation70
- Firmware70
- Front-Panel Assembly70
- Analog Assembly70
- Optional Battery71
- Figure 7-2: Source-Mode Operation Diagram71
- Figure 7-3: Meter-Mode Operation Diagram71
- Power-Supply Assembly72
- Section VIII, Troubleshooting73
General73
Potential Problems73
- Model 1140A will Not Power up73
- Front-Panel Problems74
- Figure 8-1: Charging Supply Barrier Strip (High Voltage Guard Removed)74
- Digital Assembly Problems75
- Analog Assembly Problems75
- Figure 8-2: Fuse on Analog Assembly76
- Section IX, Maintenance and Repair77
Cleaning77
Repair Procedures77
- Equipment Required77
- Orientation78
- Ribbon Cable Connections78
- Top Cover Removal78
- Figure 9-1: Model 1140A Overall View78
- Figure 9-2: Model 1140A Overall View with Top Cover Removed79
- Top Cover Installation80
- Battery Installation80
- Charging Supply Removal80
- Figure 9-3: Battery Assembly and Charging Supply (Voltage Guard Removed)80
- Charging Supply Installation81
- Figure 9-4: Underside of Left Rear Corner81
- Remote Interface Assembly Removal82
- Table 9-1: Charging Supply Barrier Strip Wires82
- Figure 9-5: Digital and Keypad Assemblies82
- Remote Interface Assembly Installation83
- Digital Assembly Removal83
- Digital Assembly Installation84
- Encoder Removal84
- Encoder Installation84
- Left Side Panel and Front-Panel Bar Removal85
- Left Side Panel and Front-Panel Bar Installation85
- Keypad Removal85
- Figure 9-6: Left Side Panel85
- Keypad Installation86
- Analog Assembly Removal86
- Figure 9-7: Analog Assembly87
- Figure 9-8: Binding Post Printed Circuit Board and TC Connector87
- Analog Assembly Installation88
- Figure 9-9: Front Left Rail with Side Panel Removed88
- Figure 9-10: Wire Connections on Binding Post Printed Circuit Board88
- Power-Supply Assembly Removal89
- Power-Supply Assembly Installation90
- Front-Panel Assembly Removal90
- Figure 9-11: Power Supply Assembly90
- Front-Panel Assembly Installation91
- Binding Post Removal92
- Binding Post Installation92
- Front-Panel Display Removal93
- Figure 9-12: Display Assembly Area93
- Front-Panel Display Installation94
- Section X, Alignment95
General95
Equipment Required95
Preliminary95
Voltage Alignment96
- DAC (Digital-To-Analog Converter) Bit Alignment96
- Divider Gain Alignment96
- Source-Mode Alignment96
- Meter-Mode Zero Alignment96
- LSB (Least-Significant Bit) Alignment96
- Meter-Mode Sensitivity Alignment97
Terminal Alignment97
- Thermocouple Alloy Corrections97
- Section XI, Calibration Procedure99
General99
Required Equipment99
Test Reports99
Procedure100
- Preliminary Setup100
- Linear-Voltage-Tests Setup100
- Figure 11-1: Initial Operating Screen for Voltage Tests100
- Linear-Voltage Tests in Source Mode101
- Figure 11-2: Setup for Source Tests101
- Linear-Voltage Tests in Meter Mode102
- Figure 11-3: Setup for Meter Tests102
- Thermocouple Voltage Tests103
- Figure 11-4: Initial Operating Screen for Temperature Tests103
- Thermocouple Alloy Tests104
- Figure 11-5: Operating Screen for Thermocouple Alloy Tests105
- Figure 11-6: Setup for Alloy Test at Binding Posts105
- Output-Current Test106
- Figure 11-7: Setup for Alloy Test at Thermocouple Connector106
- Figure 11-8: Setup for Output-Current Test106
- Section XII, Parts List109
Names of Manufacturers109
Parts List for the Model 1140A110
Options and Accessories111
Parts List for the Calibration Kit111
Appendix A, Calibration Test Reports113
Thirty-Day Specifications, ITS-90114
Six-Month Specifications, ITS-90119
One-Year Specifications, ITS-90124
Appendix B, Thermocouple Calibration129
Procedure129
General129
Equipment Required129
Figure B-1: Type E Thermocouple Calibration Setup130

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