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Introduction
Chapter 1
1-1
1.1 How to Use This Manual
This manual gives detailed instructions for setting up and operating the EG&G
Instruments Model 7220 Digital Signal Processing (DSP) dual phase lock-in
amplifier. It is split into the following chapters:-
Chapter 1 - Introduction
Provides an introduction to the manual, briefly describes what a lock-in amplifier is
and the types of measurements it may be used for, and lists the major specifications
of the model 7220.
Chapter 2 - Installation and Initial Checks
Describes how to install the instrument and gives a simple test procedure which you
may perform to check that the unit has arrived in full working order.
Chapter 3 - Technical Description
Provides an outline description of the design of the instrument and discusses the effect
of the various controls. A good understanding of the design will enable you to get the
best possible performance from the unit.
Chapter 4 - Front and Rear Panels
Describes the connectors, controls and indicators which are to be found on the unit
and which are referred to in the subsequent chapters.
Chapter 5 - Front Panel Operation
Describes the capabilities of the instrument when used as a manually operated unit,
and shows how to operate it using the front panel controls.
Chapter 6 - Remote Operation
This chapter provides detailed information on operating the instrument from a
computer over either the GPIB (IEEE-488) or RS232 interfaces. It includes
information on how to establish communications, the functions available, the
command syntax and a detailed command listing.
Appendix A
Gives the detailed specifications of the unit.
Appendix B
Details the pinouts of the multi-way connectors on the rear panel.
Appendix C
Lists three simple terminal programs which may be used as the basis for more
complex user-written programs.