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IBM 7220 Instruction Manual

IBM 7220 Instruction Manual (155 pages)

DSP Lock-in Amplifier

Brand: IBM | Category: Amplifier | Size: 0.65 MB

Table of Contents

Table of Contents
3
Chapter One, Introduction

9
Chapter Two, Installation & Initial Checks

13
- Installation
  13
  - Introduction
    13
  - Rack Mounting
    13
  - Inspection
    13
  - Line Cord Plug
    13
  - Line Voltage Selection and Line Fuses
    13
- Initial Checks
  15
  - Introduction
    15
  - Procedure
    15
Chapter Three, Technical Description

17
- Introduction
  17
- Principles of Operation
  17
  - Block Diagram
    17
  - Signal-Channel Inputs
    18
  - Line Frequency Rejection Filter
    19
  - AC Gain
    20
  - Anti-Aliasing Filter
    20
  - Main Analog to Digital Converter
    21
  - Reference Channel DSP
    22
  - Internal Oscillator
    23
  - Demodulator DSP
    23
  - Output Processor
    24
  - Main Microprocessor
    24
- Accuracy
  24
  - Absolute Accuracy Specifications
    24
  - Relative Accuracy
    25
- Dynamic Reserve
  25
- Full-Scale Sensitivity and AC Gain Control
  25
- Reference Phase and Phase Shifter
  26
- System Updates and Reference Frequency Changes
  26
- Output Channel Filters
  27
  - Slope
    27
  - Time Constants and Synchronization
    28
  - Output Offset and Expand
    28
- Use of Magnitude and Signal Phase Outputs
  28
- Auto Functions
  30
  - Introduction
    30
  - Auto-Sensitivity
    31
  - Auto-Phase
    31
  - Auto-Offset
    31
  - Auto-Measure
    32
  - Default Setting
    32
- Noise Measurements
  30
- Power-Up Defaults
  30
- Front Panel
  33
  - A and B/I Signal Input Connectors
    33
  - OSC out Connector
    33
  - REF in Connector
    34
  - Left-Hand LCD Display Panel
    34
  - MENU Key
    36
  - Key
    37
  - SET Key
    37
  - Right-Hand LCD Display Panel
    37
- Rear Panel
  38
  - Line Power Switch
    38
  - Line Power Input Assembly
    38
  - RS232 Connector
    39
  - AUX RS232 Connector
    39
  - GPIB Connector
    39
  - DIGITAL OUTPUTS Connector
    39
  - PREAMP POWER Connector
    39
  - REF MON Connector
    39
  - REF TTL Connector
    39
  - SIG MON Connector
    39
  - CH1, CH2 Connectors
    40
  - TRIG Connector
    40
  - ADC1, ADC2 Connectors
    40
  - DAC1, DAC2 Connectors
    40
  - FAST X, FAST y Connectors
    40
Chapter Five, Front Panel Operation

41
- Introduction
  41
- Setup Menu Mode
  41
  - Input Setup Menu
    42
  - Reference Setup Menu
    44
  - Output Setup Menu
    45
  - Control Options Menu
    48
  - Miscellaneous Options Menu
    50
  - RS232 Setup 1 Menu
    51
  - RS232 Setup 2 Menu
    52
  - RS232 Setup 3 Menu
    53
  - GPIB Setup 1 Menu
    54
  - GPIB Setup 2 Menu
    55
  - Digital Outputs Setup Menu
    56
  - Control Setup Menu
    57
- Auto Functions Menu
  58
- Main Display Mode - Left-Hand LCD
  60
- Main Display Mode - Right-Hand LCD
  66
- Typical Lock-In Amplifier Experiment
  75
Chapter Six, Computer Operation

77
- Capabilities
  77
  - General
    77
  - Curve Storage
    77
  - Burst Mode Acquisition
    77
  - Internal Oscillator Frequency Sweep Generator
    78
- Introduction
  77
- RS232 and GPIB Operation
  78
  - Introduction
    78
  - RS232 Interface - General Features
    78
  - Choice of Baud Rate
    79
  - Choice of Number of Data Bits
    79
  - Choice of Parity Check Option
    79
  - Auxiliary RS232 Interface
    80
  - GPIB Interface - General Features
    80
  - Handshaking and Echoes
    81
  - Terminators
    82
  - Command Format
    82
  - Delimiters
    83
  - Compound Commands
    83
  - Status Byte, Prompts and Overload Byte
    83
  - Service Requests
    85
- Command Descriptions
  86
  - Signal Channel
    86
  - Reference Channel
    89
  - Signal Channel Output Filters
    90
  - Signal Channel Output Amplifiers
    91
  - Instrument Outputs
    92
  - Internal Oscillator
    95
  - Auxiliary Outputs
    96
  - Auxiliary Inputs
    97
  - Output Data Curve Buffer
    99
  - Computer Interfaces (RS232 and GPIB)
    103
  - Instrument Identification
    105
  - Front Panel
    106
  - Default Setting
    106
- Programming Examples
  106
  - Introduction
    106
  - Basic Signal Recovery
    106
  - Frequency Response Measurement
    107
  - And y Output Curve Storage Measurement
    108
  - Transient Recorder
    108
  - Frequency Response Measurement Using Curve Storage and Frequency Sweep
    109
    
    Specifications
    111
    
    Power Requirements
    115
Appendix B, Pinouts

117
- RS232 Connector Pinout
  117
- Preamplifier Power Connector Pinout
  117
- Digital Output Port Connector
  118
Appendix C, Demonstration Programs

119
- Simple Terminal Emulator
  119
- RS232 Control Program with Handshakes
  119
- GPIB User Interface Program
  121
Appendix D, Cable Diagrams

123
- RS232 Cable Diagrams
  123
Appendix E, Alphabetical Listing of Commands

125
Appendix F, Default Settings

147
- Default Setting Function
  147
Index

149

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