IBM Car Amplifier 7220 Uživatelský manuál stáhnout pdf (Strana 17)

Technical Description

Chapter 3

3-1

3.1 Introduction

The model 7220 lock-in amplifier is capable of outstandingly good signal recovery

performance, provided that it is operated correctly. This chapter describes the design

of the instrument, enabling the best use to be made of its facilities. Of particular

importance is the correct adjustment of the AC Gain parameter, described in section

3.2.04.

3.2 Principles of Operation

3.2.01 Block Diagram

The model 7220 utilizes two digital signal processors, a microprocessor and a

dedicated digital waveform synthesizer, together with very low-noise analog

circuitry to achieve its specifications. A block diagram of the instrument is shown in

figure 3-1, and the sections that follow describe how each functional block operates

and the effect it has on the instrument’s performance.

Figure 3-1, Model 7220 - Block Diagram

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 154 155

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IBM Car Amplifier 7220 Uživatelský manuál Strana 17