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TABLE OF CONTENTS
1-1
GENERAL INFORMATION
Safety and Preparation for Use 1-3
Specifications 1-5
Abridged Command List 1-7
GETTING STARTED
Your First Measurements 2-1
The Basic Lock-in 2-3
Displays and Traces 2-7
Outputs, Offsets and Expands 2-13
Scans and Sweeps 2-17
Using the Disk Drive 2-23
Aux Outputs and Inputs 2-31
Trace Math 2-35
SR850 BASICS
What is a Lock-in Amplifier? 3-1
What Does a Lock-in Measure? 3-3
The SR850 Functional Diagram 3-5
Reference Channel 3-7
Phase Sensitive Detectors 3-9
Time Constants and DC Gain 3-11
DC Outputs and Scaling 3-13
Dynamic Reserve 3-17
Signal Input Amplifier and Filters 3-19
Input Connections 3-21
Intrinsic (Random) Noise Sources 3-23
External Noise Sources 3-25
Noise Measurements 3-27
OPERATION
FRONT PANEL 4-1
Power On/Off and Power On Tests 4-1
Video Display 4-1
Soft Keys 4-2
Keypad 4-2
Spin Knob 4-2
Disk Drive 4-2
Front Panel BNC Connectors 4-2
SCREEN DISPLAY 4-5
Default Display 4-5
Data Traces 4-6
Single/Dual Trace Displays 4-7
Bar Graphs 4-9
Polar Graphs 4-10
Strip Charts 4-11
Trace Scans, Sweeps and Aliasing 4-13
Settings and Input/Output Monitor 4-15
Menu Display 4-15
Status Indicators 4-16
KEYPAD 4-19
Normal and Alternate Keys 4-19
Menu Keys 4-19
Additional Menus 4-20
Entry Keys 4-20
START/CONT and PAUSE/RESET 4-20
CURSOR 4-21
ACTIVE DISPLAY 4-21
MARK 4-21
CURSOR MAX/MIN 4-22
AUTO RESERVE 4-22
AUTO GAIN 4-22
AUTO PHASE 4-22
AUTO SETUP 4-22
AUTOSCALE 4-22
PRINT to a PRINTER 4-23
PRINT to a FILE 4-23
HELP 4-23
LOCAL 4-23
REAR PANEL 4-25
Power Entry Module 4-25
IEEE-488 Connector 4-25
RS232 Connector 4-25
Parallel Printer Connector 4-25
PC Keyboard Connector 4-25
Rear Panel BNC Connectors 4-26
Aux Inputs (A/D Inputs) 4-26
Aux Outputs (D/A Outputs) 4-26
X and Y Outputs 4-26
Signal Monitor Output 4-26
Trigger Input 4-27
TTL Sync Output 4-27
Preamp Connector 4-27
USING SRS PREAMPS 4-27
MENUS
Menu Guide 5-1
Default Settings 5-2
Reference and Phase Menu 5-3
Input and Filters Menu 5-7
Gain and Time Constant Menu 5-9
Output and Offset Menu 5-15
Trace and Scan Menu 5-17
Display and Scale Menu 5-21
Aux Outputs Menu 5-25
Cursor Setup Menu 5-29
Edit Mark Menu 5-31
Math Menu 5-33
Disk Menu 5-41
System Setup Menu 5-49
PROGRAMMING
GPIB Communications 6-1
RS232 Communications 6-1
Status Indicators and Queues 6-1
Command Syntax 6-1