Fluke 77 Uživatelský manuál stáhnout pdf (Strana 20)

Theory of Operation

Introduction

2-3

2-1. Introduction

This chapter contains a brief overview of the 77 Series III Multimeter,

followed by a more detailed explanation of operation.

2-2. Functional Block Description

The heart of the instrument consists of a two-chip CMOS system: U1, a

primarily analog IC, and U2, a calculator-style microcomputer (see Figure 2-

1).

OHMS

300 mV

DCV

ACV

OFF

ACmV

DCmV

A/D

Input

Signal

Conditioning

Range and

Function

Control

To Bar

Graph

To Digital

Display

LCD

U2 Microcomputer

A/D Samples

32.768

kHz

Counter

U1 Analog Chip

REF

aaa01f.eps

Figure 2-1. Overview

2-3. Detailed Description

The following paragraphs describe the 77 Series III Multimeter in more detail.

While reading this description, refer to the schematic diagram in Chapter 5.

2-4. Voltage Signal Conditioning

Input divider Z1 and dc blocking capacitor C1 make up an input voltage signal

conditioning circuit.

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