Stanford Research Systems SR844 Manuals

Stanford Research Systems SR844 Manuals

Manuals and User Guides for Stanford Research Systems SR844. We have 1 Stanford Research Systems SR844 manual available for free PDF download: User Manual

Stanford Research Systems SR844 User Manual

Stanford Research Systems SR844 User Manual (246 pages)

RF Lock-In Amplifier

Brand: Stanford Research Systems | Category: Amplifier | Size: 1 MB

Table of Contents

Table of Contents

5
- Safety and Preparation for Use
  3
  - Table of Contents
    5
- Specifications
  7
Chapter 1 Getting Started

11
- Getting Started
  11
- Quick Start
  13
- The Basic Lock-In
  15
  - X, Y, R, Θ Θ Θ Θ and Dbm
    19
- Outputs, Offsets and Expands
  22
- Storing and Recalling Setups
  28
- Aux Outputs and Inputs
  29
2-1 Chapter 2 Sr844 Basics

31
- Chapter 2 SR844 Basics
  33
- What Is a Lock-In Amplifier
  33
  - Why Use a Lock-In Amplifier
    33
    
    What Is Phase-Sensitive Detection
    33
    
    Units
    34
    
    RMS or Peak
    34
    
    Degrees or Radians
    34
    
    Volts or Dbm
    35
    
    What about Signals at Other Frequencies
    35
    
    What about DC Offset and Drift
    36
    
    Where Does the Reference Come from
    36
- The Functional SR844
  38
- RF Signal Input Path
  39
  - Input Impedance
    39
    
    200 Mhz Low Pass Filter
    39
    
    20 Db Attenuator
    39
    
    20 Khz High Pass Filter
    39
    
    20 Db Gain
    39
- Reference Channel
  40
  - Auto-Threshold Comparator
    40
    
    Phase Locked Loop and Divider Chain
    40
    
    20 Mhz Reference/ Synthesizer
    40
    
    And y Reference Generator
    40
  - IF Section
    41
    
    180 Khz Low Pass Filter
    41
    
    Gain Stages
    41
    
    Anti-Aliasing Filter
    41
    
    16-Bit ADC
    41
- Inside the DSP
  42
  - Inputs
    42
    
    Demodulators
    42
    
    Phase Adjust
    42
    
    Offsets
    43
    
    Ratio
    43
    
    Time Constant Filters
    43
    
    R, Θ, Dbm Computation
    44
    
    Output Select
    44
    
    The Host Processor
    44
- Analog Outputs and Scaling
  45
  - CH1 and CH2 Outputs
    45
    
    Output Scales
    45
    
    Output Offset and Expand
    45
    
    Display Scales
    46
- What Is Dynamic Reserve
  47
  - Wide and Close Reserves
    47
- Sources of Error
  49
  - Spurious Responses
    49
    
    Square Wave Response
    49
    
    IF Sidebands
    49
    
    Coherent Pickup
    50
- Using the SR844 as a Double Lock-In
  52
- Noise Measurements
  53
  - How Does a Lock-In Measure Noise
    53
    
    Noise Estimation
    53
- Intrinsic (Random) Noise Sources
  55
  - Johnson Noise
    55
    
    Shot Noise
    55
    
    1/F Noise
    55
    
    Total Noise
    55
- External Noise Sources
  56
  - Capacitive Coupling
    56
    
    Inductive Coupling
    57
    
    Resistive Coupling or Ground Loops
    57
Chapter 3 Operation

59
- Overview
  61
  - Power
    61
    
    Reset
    61
    
    Keys
    62
    
    Key-Click On/Off
    62
    
    Keypad Test
    62
    
    Knob
    62
    
    Local Lockout
    63
    
    Front Panel Display Test
    63
    
    Display off Operation
    63
    
    Front Panel Connectors
    63
    
    Rear Panel Connectors
    64
    
    Factory Preset Values
    65
- Signal Input
  66
- Time Constants
  69
- Sensitivity
  71
- CH1 Display and Output
  73
- CH2 Display and Output
  79
- Reference Section
  85
- Save and Recall
  89
- Interface
  90
- Scan and Rel
  92
- Auto Functions
  99
- Shift Functions
  100
4-1 Chapter 4 Remote Operation

103
- Chapter 4 Programming
  104
- Index of Commands
  104
- Introduction
  109
  - Communicating with GPIB
    109
    
    Communicating with RS232
    109
    
    Indicators
    109
    
    Queues
    109
    
    Command Format
    110
    
    Command Synchronization
    110
    
    Example Program
    111
- Command Syntax
  112
  - Output Interface (RS232 or GPIB)
    112
    
    Reference and Phase Commands
    113
    
    Signal Input Commands
    114
    
    Gain and Time Constant Commands
    115
    
    Aux Input and Output Commands
    119
    
    Setup Commands
    120
    
    Auto Functions
    122
    
    Scan and Rel Functions
    123
    
    Data Storage
    124
    
    Data Storage Commands
    126
    
    Data Transfer Commands
    127
    
    Interface Commands
    131
    
    Status Reporting Commands
    132
- Status Register Definitions
  133
- Example Program
  136
Chapter 5 Performance Tests

145
- Getting Ready
  147
  - Introduction
    147
    
    Serial Number
    147
    
    Firmware Revision
    147
    
    Warm-Up
    147
    
    Test Record
    147
    
    Necessary Equipment
    147
    
    Front Panel Display Test
    148
    
    If a Test Fails
    148
- Self Tests
  149
- Amplitude Response
  151
- Phase Response
  153
- Frequency Accuracy
  155
- Ref out Amplitude
  157
- DC Outputs and Inputs
  159
- Input Noise
  161
- SR844 Performance Test Record
  163
Chapter 6 Circuitry, Parts Lists and Schematics

167
- Service
  169
- Circuit Board Locations
  170
- Circuit Descriptions
  172
  - 844C: Cpu/Power Supply Board
    172
  - 844S: Display Board
    174
  - 844K: Keypad Board
    175
  - 84RTO: Rear Panel and TTL out Board
    175
  - 84MBD: Motherboard
    176
  - 84SIG: Signal Input Board
    178
  - 84CMX: Chop and MIX Board
    179
  - 84IFN: I.F. and Noise Board
    181
  - 84XRF: External Reference Board
    183
  - 84DVC: Divider Chain Board
    186
  - 84DSP: Digital Signal Processing Board
    188
- Parts Lists
  191
  - CPU and Power Supply (844C) Board
    192
- Schematic Diagrams
  246

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