465

Tektronix 465 User Manual

50 pages

To Next Page

To Next Page

To Previous Page

To Previous Page

Page #31 background image

Loading...

Page #31 background image

Circuit Description-465

CR

1335,

and

CR

1336

provide

protection

against accidental

application

of

damaging voltage levels

to

the

+A GATE

and

+B

GA TE

output

connectors.

B

Sweep

Latch

0822

and

0828

compose

the

B Sweep Latch. Quies-

cently,

(before

either

the

A

or

B Sweeps have reached

their

maximum

amplitudes)

both

transistors

are off.

Then,

the

sweep reset pulse

from

whichever sweep

terminates

first

will be applied

to

the

base

of

0828

(A

Sweep reset

through

CR826;

B

Sweep

reset

through

CR825).

The

positive-going

reset pulse

turns

on

0828

and

the

negative-going

movement

at

its

collector

turns

on

0822.

The

collector

of

0822

in

turn

pulls

up

on

the

base

of

0828,

holding

0828

on,

which

causes

the

circuit

to

stay

in

its

on

or

latched

state.

The

HI

at

the

collector

of

0822

is

applied

to

the

base

of

the

B

Sweep Holdoff Amplifier

(through

CR809)

to

disable

the

B

Trigger

Tunnel

Diodes.

In

the

B ENDS A position of

the

A

TRIG

HOLDOFF

control

the

HI

is

also applied

to

the

holdoff

start

input

term

in

al

of

the

Sweep Control

IC

through

C286.

Thus,

when

B

Sweep

ends A Sweep ends

also.

The B Latch Multivibrator

is

reset

to

its

quiescent

state

by

the

LO

Ho I

doff

level

Present

at

pin

10

of

the

Sweep

Control

IC

during

A Sweep

holdoff.

X-AXIS

SIGNAL

FROM

CH

1

PREAMP

Sawtooth

Signal

from Sweep

Generators,

S1150

!TIME/DIV!

I

I

I

I POSITION i ;>4t---t-R_1_206-'l/',&"'R_1_2oa_•

R1205A

R1207 & R1209

\

\

\

IF~NEl

R1205B

S1239 •

lx10

MAGI

I

I

I

I

I

I

~

~

S400

HORIZONTAL

AMPLIFIER

General

The

Horizontal Amplifier

circuit

provides

the

output

signals

to

the

CRT

horizontal

deflection

plates. The signal

applied

to

the

input

of

the

Horizontal Amplifier

is

determined

by

the

TIME/DIV

switch.

The

signal can be a

sawtooth

waveform

generated

within

the

instrument,

or

some

external signal

applied

to

the

CH

1 OR X

input

connector

(X-Y

mode

of

operation).

The

Horizontal Ampli-

fier also

contains

the

X10

magnifier,

horizontal

positioning,

and

some

beam

finder

circuitry.

Fig. 3-7 shows a detailed

block diagram

of

the

Horizontal

Amplifier circuit. A

schematic

of

this

circuit

is

shown

on diagram 9

at

the

rear

of

this manual.

X-Axis Amplifier

In

all

positions

of

the

TIME/DIV

switches

except

X-Y,

the

input

signal

to

the

base

of

01224

will be

the

sawtooth

waveforms

from

the

sweep

generators.

In

the

X-Y

mode

however,

the

sweeps are disabled

and

the

signal applied

to

01224

comes from

the

Channel 1 Preamp via

the

X-Axis

Amplifier stage. This stage includes

01214,

01218,

and

their

associated

circuitry.

C1281

R1280 & R1281

R1260 & R1261

C1261

Deflection

Signal

to

CRT

Fig. 3-7. Detailed block diagram

of

the

Horizontal Amplifier.

3-14

®

.•

...

--~:

f

C

'

~

Table of Contents

Questions and Answers:

Need help?

Do you have a question about the Tektronix 465 and is the answer not in the manual?

Tektronix 465 Specifications

General

Brand	Tektronix
Model	465
Category	Test Equipment
Language	English

Related product manuals

Preview: Tektronix 466

Preview: Tektronix 465B

Preview: Tektronix TAS 465

Tektronix TAS 465

Preview: Tektronix 422

Preview: Tektronix 455

Tektronix TAS 475

Preview: Tektronix TDS 420A

Tektronix TDS 420A

Preview: Tektronix 4 Series

Tektronix 4 Series

Preview: Tektronix MSO 4 Series

Tektronix MSO 4 Series