Table of Contents
Model 1120 Remote Emulation Option 6-12
Background 6-12
Limitations 6-12
Model 1120 Remote Control Operation 6-14
Errors 6-14
Section VII, Theory of Operation
Operating Modes 7-1
Thermocouple Simulator (Alloy Output) 7-1
Precision Voltage Source (Copper Output) 7-2
Thermocouple Meter (Alloy Input) 7-2
Precision Voltmeter (Copper Input) 7-2
Thermocouple Simulator (Copper Output) 7-2
Thermocouple Meter (Copper Input) 7-2
Precision Voltage Source (Alloy Output) 7-3
Precision Voltmeter (Alloy Input) 7-3
Thermocouple Offset 7-3
Hardware Implementation 7-4
Firmware 7-4
Front-panel Assembly 7-4
Analog Assembly 7-4
Optional Battery 7-5
Power-supply Assembly 7-6
Section VIII, Troubleshooting
General 8-1
Potential Problems 8-1
Model 1140A Will Not Power Up 8-1
Front-panel Problems 8-2
Digital Assembly Problems 8-3
Analog Assembly Problems 8-3
Section IX, Maintenance and Repair
Cleaning 9-1
Repair Procedures 9-1
Equipment Required 9-1
Orientation 9-2
Ribbon Cable Connections 9-2
Top Cover Removal 9-2
Top Cover Installation 9-3
Battery Removal 9-3
Battery Installation 9-4
Charging Supply Removal 9-4
Charging Supply Installation 9-5
Remote Interface Assembly Removal 9-6
Remote Interface Assembly Installation 9-7
Digital Assembly Removal 9-7
Digital Assembly Installation 9-8
Encoder Removal 9-8
Encoder Installation 9-8
Left Side Panel and Front-panel Bar
Removal 9-9
Left Side Panel and Front-panel Bar
Installation 9-9
Keypad Removal 9-9
Keypad Installation 9-10
Analog Assembly Removal 9-10
Analog Assembly Installation 9-12
Power-supply Assembly Removal 9-13
Power-supply Assembly Installation 9-14
Front-panel Assembly Removal 9-14
Front-panel Assembly Installation 9-15
Binding Post Removal 9-16
Binding Post Installation 9-16
Front-panel Display Removal 9-17
Front-panel Display Installation 9-18
Section X, Alignment
General 10-1
Equipment Required 10-1
Preliminary 10-1
Voltage Alignment 10-2
DAC (Digital-to-analog Converter) Bit
Alignment 10-2
Divider Gain Alignment 10-2
Source-mode Alignment 10-2
Meter-mode Zero Alignment 10-2
LSB (Least-significant Bit) Alignment 10-2
Meter-mode Sensitivity Alignment 10-3
Terminal Alignment 10-3
Thermocouple Alloy Corrections 10-3
Section XI, Calibration Procedure
General 11-1
Required Equipment 11-1
Test Reports 11-1
Procedure 11-2
Preliminary Setup 11-2
Linear-voltage-tests Setup 11-2
Linear-voltage Tests in Source Mode 11-3
Linear-voltage Tests in Meter Mode 11-4
Thermocouple Voltage Tests 11-5
Thermocouple Alloy Tests 11-6
Output-current Test 11-8
Section XII, Parts List
Names of Manufacturers 12-1
Parts List for the Model 1140A 12-2
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