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SR850
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5-64
System Setup Menu
Contents
Main
MODEL SR850
DSP Lock-In Amplifier
Stanford Research Systems
Page
TABLE OF CONTENTS
1-1
GENERAL INFORMATION
GETTING STARTED
Table of Contents
1-2
TESTING
SERVICE
CIRCUITRY
SAFETY AND PREPARATION FOR USE
WARNING
1-3
Page
SR850 DSP LOCK-IN AMPLIFIER
1-5
SPECIFICATIONS
SR850 DSP Lock-In Amplifier
1-6
1-7
COMMAND LIST
1-8
1-9
1-10
STATUS BYTE DEFINITIONS
GETTING STARTED
YOUR FIRST MEASUREMENTS
Key Types
Hardkeys
Softkeys
Page
2-3
THE BASIC LOCK-IN
2-4
2-5
2-6
2-7
DISPLAYS and TRACES
2-8
2-9
2-10
Page
Page
2-13
OUTPUTS, OFFSETS and EXPANDS
2-14
2-15
2-16
2-17
SCANS and SWEEPS
2-18
2-19
2-20
2-21
2-22
2-23
USING THE DISK DRIVE
STORING AND RECALLING DATA
2-24
2-25
2-26
2-27
2-28
2-29
STORING AND RECALLING SETTINGS
2-30
2-31
AUX OUTPUTS and INPUTS
2-32
2-33
Page
2-35
TRACE MATH
2-36
2-37
2-38
2-39
2-40
2-41
Page
SR850 BASICS
Why use a lock-in?
What is phase-sensitive detection?
WHAT IS A LOCK-IN AMPLIFIER?
3-1
3-2
Narrow band detection
Where does the lock-in reference come from?
All lock-in measurements require a reference signal.
Magnitude and phase
WHAT DOES A LOCK-IN MEASURE?
RMS or Peak?
Degrees or Radians?
Page
3-5
THE FUNCTIONAL SR850
SR850 FUNCTIONAL BLOCK DIAGRAM
Page
3-7
Reference Input
Internal Oscillator
REFERENCE CHANNEL
Reference Oscillators and Phase
Phase Jitter
3-8
Harmonic Detection
THE PHASE SENSITIVE DETECTORS (PSD's)
3-9
Digital PSD vs Analog PSD
Page
3-11
Time Constants
Digital Filters vs Analog Filters
TIME CONSTANTS and DC GAIN
Synchronous Filters
3-12
Long Time Constants
DC Output Gain
What about resolution?
DC OUTPUTS and SCALING
3-13
X and Y
CH1 and CH2
X, Y, R and Output scales
3-14
Trace displays
Trace output scaling
3-15
Page
3-17
What is dynamic reserve really?
DYNAMIC RESERVE
3-18
Dynamic reserve in the SR850
Minimum dynamic reserve
3-19
Input noise
SIGNAL INPUT AMPLIFIER and FILTERS
Notch filters
3-20
Anti-aliasing filter
Input Impedance
3-21
Single-Ended Voltage Connection (A)
INPUT CONNECTIONS
3-22
Current Input (I)
AC vs DC Coupling
3-23
Johnson noise
INTRINSIC (RANDOM) NOISE SOURCES
( )
Page
3-25
Capacitive coupling
Inductive coupling
EXTERNAL NOISE SOURCES
3-26
Resistive coupling or ground loops
Microphonics
Thermocouple effects
3-27
NOISE MEASUREMENTS
3-28
R noise
POWER BUTTON
FRONT PANEL
4-1
4-2
Front Panel
SOFT KEYS
KEYPAD
SPIN KNOB
4-3
Front Panel
Page
4-5
X = 9.7284 mV
Y =-1.2050 mV
SCREEN DISPLAY
4-6
DATA TRACES
4-7
X = 9.7284 mV
SINGLE and DUAL TRACE DISPLAYS
Page
4-9
X = 9.7284 mV
BAR GRAPHS
4-10
POLAR GRAPHS
4-11
STRIP CHARTS
4-12
4-13
TRACE SCANS, SWEEPS & ALIASING
4-14
4-15
SETTINGS & INPUT/OUTPUT MONITOR
MENU DISPLAY
4-16
STATUS INDICATORS
4-17
Page
KEYPAD
4-19
8
AUTO
SRS
4-20
ADDITIONAL MENUS
ENTRY KEYS
[START/CONT] and [PAUSE/RESET]
4-21
[CURSOR]
[ACTIVE DISPLAY]
[MARK]
4-22
[CURSOR MAX/MIN]
[AUTO RESERVE]
[AUTO GAIN]
[AUTO PHASE]
4-23
[PRINT] TO A PRINTER
[PRINT] TO A DISK FILE
[HELP]
[LOCAL]
Page
4-25
POWER ENTRY MODULE
REAR PANEL
4-26
Rear Panel
REAR PANEL BNC CONNECTORS
AUX IN 1-4 (A/D Inputs)
AUX OUT 1-4 (D/A Outputs)
4-27
Rear Panel
TRIG IN
TTL OUT
PREAMP CONNECTOR
Page
SR850 MENUS
5-1
5-2
SR850 Menus
DEFAULT SETTINGS
REFERENCE AND PHASE MENU
Reference and Phase
5-3
Reference Phase
Auto Phase
5-4
Reference Source
5-5
5-6
Harmonic
Sine Output
INPUT AND FILTERS MENU
Input and Filters
5-7
Source
Current Gain
5-8
Input and Filters Menu
Grounding
Coupling
Line Notches
GAIN AND TIME CONSTANT MENU
Gain and Time Cons
5-9
Sensitivity
5-10
Reserve
5-11
Man Reserve
Auto Reserve
Time Constant
5-12
Analog Outputs with Short Time Constants
5-13
Filter dB/oct
Synchronous
Note
Page
OUTPUT AND OFFSET MENU
Output and Offset
5-15
Front Panel CH1 and CH2
5-16
Output and Offset Menu
Output Offset and Expand
TRACE AND SCAN MENU
Trace and Scan
5-17
Trace
5-18
Trace and Scan Menu
Sample Rate
5-19
Trace and Scan Menu
Scan Length
Page
DISPLAY AND SCALE MENU
Display and Scale
5-21
Format
Monitor
5-22
Display and Scale Menu
Page
Page
AUX OUTPUTS MENU
Aux Outputs
5-25
Aux Outputs
5-26
Aux Outputs Menu
Voltage
Sweep Limits
5-27
Aux Outputs Menu
Trigger Starts?
Page
Cursor Seek
Cursor Setup
CURSOR SETUP MENU
5-29
5-30
Cursor Setup Menu
Cursor Width
Vert Grid Divs
Cursor Control
EDIT MARK MENU
5-31
5-32
Edit Mark Menu
Edit Mark
Delete Mark
Cursor to Next
MATH MENU
Math
5-33
Math Keys
5-34
Smooth
25 point 21 point 17 point 11 point 5 point
5-35
Fit
Do Fit
Type of Fit
View Parameters
5-36
5-37
Left and Right Limit
Return
5-38
Calc
Do Calc
Operation
5-39
Argument Type
5-40
Stats
Do Stats
Left and Right Limit
Disk Keys
DISK MENU
Disk
5-41
5-42
Save Data
5-43
5-44
Recall Data
5-45
5-46
Save Settings
5-47
Recall Settings
5-48
Disk Utilities
SYSTEM SETUP MENU
5-49
System Setup
Setup Keys
5-50
Settings Keys
Settings
5-51
Setup Communications
Output to RS232/GPIB
5-52
Setup GPIB
Setup RS232
5-53
View Queues
5-54
Setup Sound
Key Click Alarms
5-55
Setup Plotter
Plot Mode
5-56
Plot Speed
Define Pens
5-57
Setup Printer
Printer Type
5-58
Setup Screen
Move Right Move Left Move Up Move Down
5-59
Setup Time
Time
Date
Page
5-61
Plot All
5-61
Plot Trace
Plot Cursor
Plot Abort Return
Plot
Page
5-63
About the SR850 About SRS Operating Hints Command List Status Bytes
Return
Info
Page
5-65
Keypad Test
Keyboard Test
Knob Test
Test Hardware
5-66
Disk Drive Test
RS-232 Test
Memory Test
Screen Test Printer Test
REMOTE PROGRAMMING
6-1
6-2
INTERFACE READY AND STATUS
GET (GROUP EXECUTE TRIGGER)
6-3
DETAILED COMMAND LIST
correct interface at the beginning of every program.
Remember!
6-4
REFERENCE and PHASE COMMANDS
Page
6-6
INPUT and FILTER COMMANDS
6-7
GAIN and TIME CONSTANT COMMANDS
Page
6-9
OUTPUT and OFFSET COMMANDS
6-10
TRACE and SCAN COMMANDS
6-11
DISPLAY and SCALE COMMANDS
6-12
6-13
CURSOR COMMANDS
6-14
MARK COMMANDS
6-15
AUX INPUT and OUTPUT COMMANDS
6-16
MATH COMMANDS
6-17
6-18
STORE AND RECALL FILE COMMANDS
6-19
SETUP COMMANDS
Page
Page
6-22
FRONT PANEL CONTROLS and AUTO FUNCTIONS
6-23
DATA TRANSFER COMMANDS
6-24
6-25
6-26
Page
6-28
INTERFACE COMMANDS
6-29
STATUS REPORTING COMMANDS
6-30
STATUS BYTE DEFINITIONS
6-31
6-32
6-33
EXAMPLE PROGRAM 1 Using Microsoft C (v5.1) with the National Instruments GPIB card on the IBM PC.
6-34
6-35
6-36
Page
Page
6-39
6-40
6-41
6-42
PERFORMANCE TESTS
Introduction
[HARDKEYS]
<Softkeys>
7-1
7-2
General Installation
7-3
Necessary Equipment
Warm Up
The Test Record
If A Test Fails
Page
7-5
1. Self Tests
Page
7-7
2. DC Offset
Page
7-9
3. Common Mode Rejection
Page
7-11
4. Amplitude Accuracy and Flatness
7-12
7-13
5. Amplitude Linearity
7-14
6. Frequency Accuracy
Page
7-17
7. Phase Accuracy
Page
7-19
8. Sine Output Amplitude Accuracy and Flatness
Page
7-21
9. DC Outputs and Inputs
7-22
10. Input Noise
Page
SR850 Performance Test Record
1. Self Tests
2. DC Offset
Page
SR850 Performance Test Record 9. DC Outputs and Inputs (continued)
7-27
SR850 Performance Test Record 9. DC Outputs and Inputs (continued)
10. Input Noise
7-28
SR850 SERVICE
8-1
CAUTION
CIRCUIT BOARDS
Page
8-3
Adjusting the DC Offset and Common Mode Rejection
8-4
8-5
8-6
Adjusting the Notch Filters
8-7
Page
CIRCUIT DESCRIPTION
CAUTION
VIDEO DRIVER AND CRT
CIRCUIT BOARDS
9-1
Page
CPU BOARD
9-3
9-4
POWER SUPPLY BOARD
9-5
Page
DSP LOGIC BOARD
9-7
9-8
ANALOG INPUT BOARD
9-9
9-10
9-11
9-12
9-13
DSP Logic Board Parts List
9-14
9-15
9-16
9-17
9-18
9-19
9-20
Analog Input Board Parts List
9-21
9-22
9-23
9-24
9-25
9-26
9-27
CPU Board Parts List
9-28
9-29
9-30
9-31
9-32
Chassis Assembly Parts List
9-33
9-34
9-35
Miscellaneous Parts List