DATA PRECISION 1350 User Manual

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62-5008

MODEL

1350

During

Step

2

(INT

Is

closed),

the

A/D

Input

Is

connected

to

the

buffer

amplifier

whose

output

Is

connected

In

series

with

the

zero

compensation

to

the

Integrator.

During

Step

3

(DE

Is

closed),

the

pair

of

DE

switches

Is

closed

to

connect

the

voltage

across

C4

to

the

AID

Input

with

the

proper

polarity

convention

to

reduce

the

voltage

previously

built

up

on

Integrating

capacitor

C5.

4.5.2.

Digital

Section

of

the

AID

Converter

The

digital

section

of

the

A/D

Converter

contains

counters

and

logic

cir

cuitry

with

which

to

develop

the

3-step

timing

signals

and

to

generate

driv

ing

signals

for

each

of

the

seven

segments

of

the

3

full

decades,

as

well

as

the

driving

signal

for

the

MSB

"1

This

section

of

the

10

also

Includes

the

circuitry

to

determine

and

drive

the

correct

polarity

sign

In

the

display,

to

sense

an

out-of-range

condition,

and

to

blank

the

digits

In

the

display.

R12/R11

, ,

cB

—»AA/

+RKF

-REF

WFF

OUTPUT

OF

COMPARATOR

nF(

+

)

OF

-

ANALOO

COMMON

IN

LO

Q

TO

DiniTAL

I

SECTION

4-8

Figure

4-7.

A/D

Converter

Analog

Section

Simplified

Schematic

''Copyright

1977.

Data

Pracition

Corporation.

All

righti

ratarvad.

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DATA PRECISION 1350 Specifications

General

Brand	DATA PRECISION
Model	1350
Category	Multimeter
Language	English