Schlumberger Heath sm-128a User manual

OPERATION/SERVICE

MANUAL

Schlumberger

OPERATION/SERVICE

MANUAL

Schlumberger

•

Copyright

1973

Heath

Company

All

rights

reserved

H E

AT

H

Schlumberger

MODEL

SM-128A

AUTO-RANGING

FREQUENCY

COUNTER

HEATH

COMPANY

BENTON

HARBOR,

MICHIGAN

49022

a

Schlumberger

company

595-1556-01

Printed

in

U.

S.

A.

Page

2

•

Table

of

Contents

Introduction

3

Specifications

4

Operation

5

Circuit

Description

6

Recal

i

bra

tion

9

Parts

List

9

Circuit

Board

X-Ray

View

11

Integrated

Circuit

Base

Diagrams

13

Schematic..

.(fold-out

from

page)

15

•

Page

3

•

INTRODUCTION

•

This

instrument

is

a

compact,

lightweight,

auto-ranging

counter

designed

for

frequency

measurement

from

less

than

5

Hz

to

greater

than

110

MHz.

The

front

panel

range switch

allows

selection

of

two

preset

gate

intervals

(1s

and

10ms)

and

AUTO-range.

This

unique

function

automatically

determines

the

correct

range

for

maximum

resolution

without

overranging

the

counter.

In

the

two

manual

range

positions,

the

LSD

(least-significant

digit)

will

remain

valid

even

though

the

MSD

(most

significant

digit)

is

beyond

display

range.

A

sensitivity

control

allows

input

trigger

level

selection

above

and

below

the

signal

zero-crossing

level.

Refer

to

Figure

1

(fold-out

from

Page

5)

for

typical

and

guaranteed

sensitivity-vs-frequency

parameters.

High

input

sensitivity

and

an

input

impedance

of

1

megohm

proves

ideal

for

use

with

a

÷10

oscilloscope

probe

where

source

loading

is

critical.

Display

consists

of

seven

7-segment

LED

(light

emitting

diode)

arrays

and

three

incandescent

lamps

for

Range

and

Overrange

information.

In

addition, leading-zero

blanking

is

provided

when

less

than

seven

digits

of

data

is

displayed.

A

time

base

of

1

MHz

is

produced

by

a

conventional

crystal

clock.

However,

a

rear

panel

connector

is

provided

for

connection

of

external

clock

frequencies

(e.g.

a 1

MHz

standard

when

extreme

accuracy

is

desired).

Rugged

compact

design

and

exceptional

accuracy

combine

to

make

the

counter

an

invaluable

tool

for

the

scientist,

engineer,

experimenter,

and

service

technician.

While

this

instrument

is

excellent

in

the

laboratory,

it

is

rugged

enough

for

use

in

the

field.

Low

input

power

of

25

watts

facilitates

its

use

with

a

dc-to-ac

power

inverter.

Page

4

SPECIFICATIONS

INPUT*

Frequency

Range

5

Hz

to

110

MHz

minimum

(typ.

130

MHz

at

25

°

C).

Sensitivity

15

mV

rms.

Input

Impedance

1

MS

-t

shunted

by

15

pF.

Maximum

Voltage

200

V

rms.

TIME

BASE

OSCILLATOR

(Referenced

to

25

°C

after

1/2-hour

warmup.)

Frequency

1

MHz.

Setability

±0.1

Hz.

Maximum

Aging

Rate

<1

ppm/mo

(<7.5

ppm/yr).

Temperature

Stability

±10

ppm,

maximum,

0°

to

40

°C

ambient.

EXTERNAL

OSCILLATOR

Frequency

DC

to

2

MHz.

Sensitivity

TTL

or

2.5

V

rms

from

50

St

source.

Protection

—5V

peak

to

+10V

peak.

RANGES-GATE

INTERVAL

Manual

kHz

-

1s,

MHz

-

10ms.

Auto

kHz

-

10s,

kHz

-

1s,

MHz

-

100ms

or

MHz

-

10ms

(dependent

on

incoming

signal).

GENERAL

Display

Time

200ms

plus

Gate

Interval.

Power

Requirements

105-130V,

50/60

Hz,

25

watts

maximum.

(210-260V,

50/60

Hz

switch

selected.)

Fuse:

125-volt

Operation

250-volt

Operation

1/4-ampere,

125V

slow-blow.

1/8-ampere,

250V

slow-blow.

Dimensions

2.75"

high,

7.25"

wide,

and

10.5"

deep

(less

handle).

(6.98

cm

high,

18.4

cm

wide,

and

26.67

cm

deep.)

Net

Weight

5

lbs.

(2.3

kgs.)

*

See

Input

curves

Figures

1

and

2

on

fold-out

from

Page

5.

Specifications

were

obtained

using

a

generator

with

50

St

source

impedance.

This

was

connected

to

the

counter

with

50

St

coaxial

cable

through

a

50

St

terminator

(between

cable

and

counter).

•

Page

5

•

OPERATION

Your

counter

was

carefully

checked and

calibrated

at

the

factory

prior

to

shipment and

is

ready

for

operation

when

it

is

unpacked.

If

the shipping

container

shows

evidence

of

rough

handling,

inspect

the

unit

carefully

for

damage.

Report

any

damage

immediately

to

the

carrier.

CAUTION:

Before

you

proceed

with

this

section,

be

sure

you

have

read

the

Specifications.

Damage

to

the

instrument

can

result

if

excessive

voltage

is

applied

to

the

input.

Input

protection

is

provided

as

shown

in

the

Derating

Curve

of

Figure

2.

120-240

VOLT

OPERATION

When

shipped,

this

instrument

is

ready

for

operation

from

a

105-130

volt

(120

volt

nominal)

ac

power

source.

If

210-260

volt

(240

volt

nominal)

ac

operation

is

desired,

remove

the

handle

and

the

four

screws

from

the

bottom

and

rear

of

the

cabinet

shell.

Remove

the

cabinet

shell,

then

set

the

120-240

power

switch

to

the

240

position.

Replace

the

1/4-ampere

fuse

with

a

1/8-ampere,

250-volt

slow-blow

fuse

and

reinstall

the

cabinet

shell

and

handle.

NOTE:

Electrical

regulations

in

some

areas

require

a

special

line

cord

and/or

plug

for

240-volt

operation.

Replace

if

necessary.

CONTROLS-CONNECTORS

AND

DISPLAY

RANGE

SWITCH:

Selects

either

of

two

gate

intervals

or

AUTO-range.

In

the

Auto

mode,

the

proper

gate

interval

is

selected

by

the

instrument

to

provide

the

greatest

resolution

without

Overrange.

NOTE:

For

external

clock frequencies

other

than

1

MHz,

the

display

must

be

interpreted.

SENSITIVITY

CONTROL:

Serves

as

the

power

switch

and

allows

adjustment

of

the

input

amplifier

trigger

level

above

and

below

zero-crossing

point.

Thus,

the

trigger

point

can

be

set

above

most

noise

or

signal

distortion

to

insure

an

accurate count.

Its

full-clockwise

switched

position

presets

the

input

to

its

calibrated

sensitivity

level.

NOTE:

The

Preset

circuitry

requires

10-15

seconds

to

stabilize.

The

instrument

will

not

count

during

this

period.

DISPLAY:

Seven

7-segment

LED's

display

the

count,

while

the

decimal

points

and

range

indicators

provide

complete

range

information.

In

addition,

all

insignificant

leading

zeros

are

blanked.

OVER RANGE

LAMP:

Lights

to

indicate

that

the

MSD

is

beyond

the

range

of

the

display.

INPUT

High

impedance

signal

input

connector.

CAUTION:

Signal

cables

not

terminated

in

their

characteristic

impedance

may

cause

erratic

counting

due

to

reflections

or

possible

signal

degradation.

OSCILLATOR

(clock)

SELECT

SWITCH:

Selects

internal

1

MHz

time

base

clock

or

externally

applied

clock

signal.

EXTERNAL

OSCILLATOR

INPUT:

Rear

panel

connector

allows

application

of

an

external

clock

signal

(Oscillator

Select

switch

must

be

in

the

EXT

position).

Refer

to

the

counter

specifications

for

signal

parameters.

OPERATING

PROCEDURE

Place

the

EXT/INT

Oscillator

switch

in

the

I

NT

position.

Turn

the

unit

ON

and

switch

to

the

PRESET

position.

Select

the

desired

range

(manual

1

second

or

10

milliseconds,

or

AUTO)

and

connect

the

signal

to

be

counted

to

the

INPUT

connector.

CAUTION:

Be

sure

the

signal

is

within

the

parameters

specified

for

this

instrument.

Always

terminate

the

transmission

line

in

its

characteristic

impedance

(e.g.

50

ohm

coaxial

cable

should

drive into

a

50

ohm

resistive

load).

This

will

eliminate

reflections

along

the

line

which

could

damage

the

equipment

under

test,

or

produce

inaccurate

readings.

If

the

display

overranges

in

the

1

second

range,

switch

to

10

milliseconds

or

AUTO,

and

read

the

frequency

directly

in

kHz

or

MHz.

When

in

the

AUTO

mode,

allow

the

unit

enough

time

to

select

the

correct

range

and

display

the

frequency.

For

frequencies

below

1

MHz,

the

AUTO

Mode

will

select

the

10

second

time

base.

This

will

result

in

a

delay

between

10

and

20

seconds,

depending

on

the

count

time

and

signal

applied,

before

a

correct

count

is

displayed.

In

applications

where

noise

exceeds

15

millivolts

or

signal

distortion

occurs

above

15

millivolts

and

causes

count

inaccuracies,

use

the

Sensitivity

control

to

raise

the

tigger

level

above

the

noise

level.

NOTE:

When

this

instrument

is

in

the

AUTO

mode

with

no

input

signal

applied,

a

few

counts

may

appear

on

the

display.

This

is

a

normal

condition

attributed

to

the

highly-sensitive

input,

and

to

the

long

time

base

used

in

the

Auto

mode.

A

correct

display

will

appear

within

seconds

after

you

apply

an

input

signal.

Page

6

EXTERNAL

OSCILLATOR

When

a

clock

frequency

other

than

1

MHz,

or

where

a 1

MHz

standard

is

required,

connect

the

signal

to

the

External

Oscillator

jack

and

switch

the

Oscillator

Select

to

EXT.

To

prevent

reflections,

terminate

the

transmission

line.

Refer

to

the

Counter

Specifications

for

External

Oscillator

signal

parameters.

OPERATION

NOTES

Because

of

the

high

input

sensitivity,

power

line

frequency

may

be

counted

if

the

instrument

under

test

does

not

share

the

power

line

ground

bus

with

the

counter.

High

level

voltage

transients

may

also

produce

inaccurate

indications

due

to

the

sensitive

input.

SENSITIVITY

The

Sensitivity

control

acts

in

a

manner

similar

to

a

trigger

level

control.

Instead

of

attenuating

the

incoming

signal,

it

changes

the

point

at

which

the

counter

will trigger.

As

shown

in

Figure

3,

maximum

sensitivity

is

either

in

the

center of

the

control

rotation or

in

the

preset

position

(CW).

SENS

ITI

VITY

CONTROL

MIN

POS

SENS

ZERO

CROSSING

..

1

MAX

SENS

de'

MIN

NEG

SENS.

POWER

OFF

PRESET

ZERO

CROSSING

MINIMUM

POSITIVE

SENSITIVITY

MAXIMUM

SENSITIVITY

Figure

3

MINIMUM

NEGATIVE

SENSITIVITY

Minimum

sensitivity

(1V

R

MS)

can

be

realized

just

prior

to

the

Power

off

position

or

just

prior

to

the

Preset

position.

When

you

measure

a

signal

with

a

high

noise

floor

(see

Figure

4),

you

may

experience

incorrect

readings

if

you

have

the

counter

set

for

maximum

sensitivity

(or

zero

crossing).

To

avoid

the

problem,

adjust

the

Sensitivity

control

to

either side

of

zero

crossing

to

the

point

where

it

will

not

trigger

on

the

noise

but

will

still

trigger

on

the

desired

signal.

SIGNAL

NOI

SE

Figure

4

NOTE:

The

Sensitivity

control

will

not

reduce

the

problem

where

an

erratic

reading

is

caused

by

noise

riding

on

the

signal,

as

shown

in

Figure

5.

This

problem

can,

however,

be

reduced

by

using

an

attenuator

between

the

equipment

being

tested

and

the

frequency

counter.

A

10:1

oscilloscope

probe

such

as

the

Heathkit

PKW-101

is

ideal

for

this.

Figure

5

CIRCUIT

DESCRIPTION

This

Frequency

Counter

consists

of

an

input

section,

control

circuits,

display,

auto-ranging

circuits,

and

a

power

supply.

Refer

to

the

Block

Diagram

(Figure

3)

and

the

Schematic

for

interrelation

of these

circuits

as

described

in

the

paragraphs

that

follow.

INPUT

The

Input

circuitry

consists

of

a

protected,

high-impedance

FET/Bipolar

pair;

a

two-stage,

direct-coupled,

differential

A

precise

time

base

that

controls

all

of

the

gate

and

timing

cascode

amplifier;

and

a

Schmitt

trigger.

For

stabilization,

the

cascode

amplifier

has

100%

dc

feedback.

This

is

provided

by

an

operational

amplifier

so

that

a

maximum

of

15

mV

offset

exists

at

the

input

of

the

Schmitt

trigger

in

the

Preset

mode.

The

Sensitivity

control

adjusts

the

offset

level

when

not

Preset.

CONTROL

•

Page

7

•

circuits,

and

determines

the

accuracy

of

the

instrument,

is

produced

by

the

1

MHz

Oscillator/Scaler.

The

oscillator

section

can

be

replaced

with

an

external

clock

for

special

applications.

To

obtain

the

desired

gate time,

the

1

MHz

clock

(or

external clock)

is

divided

by

the

number

of

decades

determined

by

the

Range

switch.

Auto-range

will

be

described

later.

A

single

MOS

LSI

integrated

circuit

(IC-9)

performs

the

scaling

function

and

is

directly

controlled

by

the

Range

switch.

Decimal

point

placement

and

the

range

lamps

are

also

controlled

by

the

Range

switch.

The

output

of

the

scaler

is

processed

by

the

Gate

Control

to

provide

ECL-level

timing

pulses

required

by

the

Control

Gate.

A

second

output

produces

the

necessary

TTL

levels

for

the

Reset

and

Memory

Control.

Reset

and

memory

pulses of

30µs,

and

a

200ms

hold-off

pulse, are

generated

by

the

Reset

and

Memory

Control.

These

pulses

update

the

memory

readout

registers,

reset

the

DCU's

and

Overrange

circuit,

and

inhibit

the

counter

during

the

display

time.

The

reset

pulse

is

also

used

by

the

Auto-Ranging

Circuit.

DISPLAY

The

gated

input

signal

(ECL

level)

is

counted

by

the

First

DCU.

Its

BCD

output

is

translated

to

a

TTL

level

and

connected

to

the

LSD

Display.

Bits

C

and

D

from

the

first

DCU

are

also

NOR'ed

for

carry-over

to the

second

display

device.

The

LSD

device

is

a

single

package

that

contains

a

memory,

decoder

drivers,

and

a

7-segment

LED.

The

INPUT

>4

1

SIGNAL

INPUT

CIRCUIT

YOVJP.

15V

12V

EXT

CLOCK

GATE

V

remaining

six

displays

are

similar,

except

they

also

contain

a

decade

counter.

Each

display

package

is

designed

to

provide

leading-zero

blanking.

However,

for

meaningful

display,

the

blanking

function

for

readout

#4

and

#5

is

gated

by

the

decimal

signal.

Should

the

count-per-unit-time

exceed

the

capacity

of

the

Display,

the

spillover

from

the

MSD

will

trigger

the

Overrange

circuit

and

turn

on

the

Overrange

lamp.

AUTO

-

RANGING

CIRCUIT

Auto-ranging

control

signals

are

derived

from

a

2-bit

binary

counter.

The

trailing

edge

of

the

Reset

pulse

toggles

the

counter

and

its

binary

output

programs

the

scaler.

The

ripple-blanking

output

of

the

MSD

and

the

overrange

output

determine

whether

the

counter

will

increment,

halt,

or

reset.

POWER

SUPPLY

The

supply

operates

from

either

105-130

volts

or

210-260

volts,

50/60

Hz,

depending

on

the

position

of

the

primary-power-select

switch.

It

supplies

three

lines

of

regulated

5

volts;

one

line

to the

Input

and

First

DCU

circuits,

a

second

line

to

the

Display,

and

the

third

line

to

the

Control

circuits.

The

Input

circuit

is

also

supplied

with

regulated

±-

15

volts.

A

regulated

—12

volts

powers

the

Oscillator/Scaler.

DISPLAY

1ST

LED,

DRIVER,

LATCH

tt

t t

TRANSLATOR

AND

FIRST

DCU

GATE

CONTROL

--

T

---

1XT

O

INT

e.

ir

1MHz

OSCILLATOR/

SCALER

e

DISPLAY

2ND,3RD,4TH,5TH,6TH,7TH

LED,

DRIVER,LATCH,

COUNTER

RESET

MEMORY

CONTROL

AUTO

RANGING

CIRCUIT

Figure

6

Block

Diagram

of

the

Auto-Ranging

Frequency

Counter

OVERRANGE

CIRCUIT

0

AUTO

Page

8

•

GROUND

TEST

P01

NT

•

Figure

7

Instrument

test

point

and

calibration

controls.

•

100

90

80

70

60

50

40

E

INPUT

VOLTAGE

30

25

20

15

10

9

8

7

5

4

3

25

2

1 5

1 5 2

25

3 4 5 6 7 8

910

15

20 25

30

40

50 60 70 80

90100

GUARANTEED

TYPICAL

6M 8M

1 M

20M 40M 60M 80M

100M

80

-J

0

70

I-

60

D

O.

50

-

40

E

D

30

20

10

o

100

lk

10k

100k

1M

FREQUENCY

(Hz)

2M

Figure

1

Input

frequency

response

curves

showing

typical

and

guaranteed

response

with

sensitivity

control

in

the

Preset

position.

3M 4M

5M

10M

20M

30M

40M

50M

60M

70M

80M 90M

100M

110M

120M 130M

FREQUENCY

(Hz)

Figure

2

Input

derating

curve

200M

Page

9

•

RECALIBRATION

Calibration

of

this

instrument

should

not

be

attempted

unless

you

are

experienced

and

have

the use

of

precision

laboratory

equipment.

Figure

7

shows

the

location

of

the

adjustments

and

test

point.

Either

the

clock or

input

amplifier

calibration

can

be

performed

independently

of

the

other.

CLOCK

CALIBRATION

To

calibrate

the

oscillator,

a 1

MHz,

or

greater,

standard

with

an

accuracy

of

at

least

±-1

part

in

10

7

is

required.

Remove

the

handle

and

the

four

screws

located

on

the

bottom

and

rear

of

the

counter.

Allow

the

counter

to

warm

up

for

at

least

30

minutes.

Connect

the

standard

frequency

to

the

front

panel

input.

Set

the

Range

switch

to

the

1

second

position

and

Sensitivity

to

the

PRESET

position.

KEY

No.

PART

DESCRIPTION

No.

RESISTORS

Quickly

remove

the

cover

and,

with

a

nonmetallic

alignment

tool,

adjust

C9

for

a

display

equal

to

the

Standard

frequency.

Reinstall

the

cover

and

allow

the

instrument

temperature

to

stabilize.

Readjust

C9

if

necessary.

Remove

the

Standard

and

install

the

cover,

screws,

and

handle.

INPUT

AMPLIFIER

ADJUSTMENT

A

dc

voltmeter

with

1

mV

sensitivity

is

required

for

this

adjustment.

Allow

the

meter

and

counter

sufficient

time

to

warm

up.

Remove

the

handle

and

cover.

Connect

the

meter

to

the

counter

ground,

near

the

test

point,

and

to

the

test

point

illustrated

in

Figure

4

(R31

or

R33).

With

no

signal

input,

adjust

R22

in

the

counter

for

3.60

volts,

±-

10

millivolts.

The

input

amplifier

is

now

properly

adjusted.

Remove

the

meter

leads

and

install

the

cover

and

handle.

PARTS

LIST

(All

resistors

are

1/4-watt,

5%

unless

otherwise

specified.)

R1

1-87-12

R2

1-87-12

R3

1-63-12

R4

1-62-12

R5

1-60-12

R6

1-106-12

R7

1-78-12

R8

1-64-12

R9

1-69-12

R10

1-64-12

R11

1-60-12

R12

1-60-12

R13

1-56-12

R14

1-72-12

R15

1-62-12

R16

1-62-12

R17

1-65-12

R18

1-67-12

R19

1-67-12

R20

63-702

R21

1-118-12

R22

10-940

1

MIZ

1

rvin

270

,S2

220

n

100

n

3600

n

6800

n

390

n

1000

n

390

n

100

n

100

n

15

n

2200

n

220

n

220

n

470

n

680

n

680

n

1000

n

control, part

of

switch

Si

620

n

200

n

control

KEY

PART

DESCRIPTION

No. No.

Resistors

(cont'd.)

R23

1-55-12

R24

1-55-12

R25

1-63-12

R26

1-63-12

R27

1-107-12

R28

1-137

R29

1-63-12

R30

NOT

USED

R31

1-63-12

R32

1-84-12

R33

1-84-12

R34

1-65-12

R35

1-69-12

R36

1-63-12

R37

1-63-12

R38

1-65-12

R39

1-102-12

R40

NOT

USED

R41

1-63-12

R42

1-60-12

R43

1-63-12

R44

1-63-12

R45

1-63-12

R46

1-60-12

R47

1-63-12

10

n

10

n

270

ft

270

n

82

S2

200

n,

1/2-watt

270

n

270

n

100

kn

100

kS2

470

n

woo

n

270

n

270

n

470

n

68

n

270e

100

n

270

n

270

S2

270

St

100

n

270

n

Page

10

KEY

No.

Resistors

R48

R49

R50

R51

R52

R53

R54

R55

R56

R57

R58

R59

R60

R61

R62

R63

R64

R65

R66

R67

R68

R69

R70

R71

R72

R73

R74

PART

No.

(cont'd.)

1-63-12

NOT

USED

1-60-12

1-63-12

1-60-12

1-61-12

1-111-12

1-87-12

NOT

USED

1-63-12

1-94-12

1-92-12

1-68-12

1-63-12

1-83-12

1-80-12

NOT

USED

NOT

USED

1-65-12

1-64-12

CAPACITORS

Cl

21-3

C2

21-192

C3

21-192

C4

NOT

USED

C5

21-192

C6

25-223

C7

25-223

C8

21-143

C9

31-57

C10

20-110

C11

20-118

C12

21-84

C13

21-143

C14

25-252

C15

21-42

C16

21-99

C17

25-220

C18

25-220

C19

25-272

C20

20-78

C21

25-220

C22

25-220

DESCRIPTION

270

S2

270

n

100n

270

n

270

n

270

n

270

n

100

n

180

1.5

Mn

1

Mn

270

,n

18

Id2

330

n

820

n

2702

47

kn

27

0,

10

kn

10

kn

470

n

470

n

390

0,

10

pF

ceramic

0.1

pF

ceramic

0.1

pF

ceramic

0.1

pF

ceramic

47

pF

tantalum

47

pF

tantalum

0.05

pF

ceramic

2.7-20

pF

ceramic

trimmer

75

pF

mica

15

pF

mica

24

pF

ceramic

0.05

/IF

ceramic

15

pF

tantalum

0.01

pF,

1.6

kV

ceramic

0.2

pF

ceramic

10

pF

tantalum

10

pF

tantalum

6000

pF

electrolytic

56

pF

mica

10

pF

tantalum

10

pF

tantalum

KEY

No.

PART

No.

Capacitors

(cont'd.)

C23

25-241

C24

25-241

C25

25-220

DIODES

D1

D2

D3

D4

D5

D6

D7

D8

D9

D10

Dll

D12

D13

D14

D15

D16

D17

D18

D19

56-86

56-56

56-67

NOT

USED

56-61

56-59

56-56

57-71

NOT

USED

57-71

57-65

NOT

USED

56-36

56-57

TRANSISTORS

01

02

Q3

04

05

06

07

08

09

010

011

012

013

Q14

015

016

017

018

019

020

021

Q22

023

024

417-828

417-292

417-293

417-235

417-292

417-813

417-275

NOT

USED

417-275

417-293

417-235

NOT

USED

417-235

DESCRIPTION

1200

pF

electrolytic

1200

pF

electrolytic

10

pF

tantalum

FD777

1

N4149

VR-10A

10-volt

zener

GESTB

stabistor

1N750A

4.7-volt

zener

1N4149

Selected

rectifier

Selected

rectifier

1

N4002

1

N4002

1N4002

VR-16.1G

16.1-volt

zener

VR-16.1G

16.1-volt

zener

1N716A

12-volt

zener

Selected

E304

2N5771

2N5770

2N4121

2N5771

2N4959

MPS6522

2N5770

2N4121

Page

11

•

KEY

No.

•

PART

No.

Transistors

(cont'd.)

025

417-235

026

417-235

027

417-118

028

NOT

USED

029

417-224

030

NOT

USED

031

417-225

DESCRIPTION

2N4121

2N3393

MPSUO5

MPSU55

INTEGRATED

CI

RCUITS

IC-1

442-22

IC-2

443-82

IC-3

443-79

IC-4

443-615

IC-5

443-614

IC-6

443-614

IC-7

443-614

IC-8

443-614

IC-9

443-614

IC-10

443-614

IC-11

443-6

IC-12

443-46

IC-13

443-46

IC-14

443-77

IC-15

443-57

IC-16

443-625

741

operational

amplifier

9528

ECL

dual

D-type

flip-flop

95H03

ECL

triple

2-in

OR/NOR

gate

TI

L308

numeric

display

TI

L306

numeric

display

TI

L306

numeric

display

T I

L306

numeric

display

TI

L306

numeric

display

TI

L306

numeric

display

T I

L306

numeric

display

7474

dual

D-type

flip-flop

7402

quad

2-in

positive

NOR

gate

7402

quad

2-in

positive

NOR

gate

7438

quad

2-in

NAND

gate

(open-collector)

MC3003P

quad

2-in

OR

gate

74132

quad

2-in

NAND

gate

(Schmitt

trigger)

KEY

No.

PART

DESCRIPTION

No.

Integrated

Circuits

(cont'd.)

IC-17

443-46

IC-18

443-83

IC-19

443-82

7402

quad

2-in

positive

NOR

gate

95H28

ECL

high

speed

dual

D-type

flip-flop

9528

ECL

dual

D-type

flip-flop

IC-20

NOT

USED

IC-21

443-84

MK5009

oscillator-scaler-

matiplexer

IC-22

443-5

7473

dual

J-K

master-slave

flip-flop

IC-23

443-23

74122

monostable

multivi-

brator

IC-24

442-54

UA7805

5-volt

regulator

IC-25

442-54

UA7805

5-volt

regulator

IC-26

442-54

UA7805

5-volt

regulator

GENERAL

PARTS

F1

L1

L2

L3

Si

S2

S3

Ti

Y1

421-33

1/4-ampere

slow-blow

fuse

412-31

Lamp,

6V,

60

mA

412-31

Lamp,

6V,

60

mA

412-31

Lamp,

6V,

60

mA

63-702

Range/Power/Sensitivity

switch/control

60-11

Internal-External

slide

switch

60-68

Line-Voltage-Select

slide

switch

54-834

Transformer

404-424

Oscillator

crystal

(1

MHz)

CIRCUIT

BOARD

X-RAY

VIEWS

DISPLAY

CIRCUIT

BOARD

(Viewed

from

component

side)

Page

12

•

—09

C23

R59

C12

I I

Cil

C14

06

IC

23

IC

22

IC 11

e

IC

17

E

C<027

8

—R35—

D13 D15

I I

012 D14

1162

C19

C24

IC

-24

C 1

019

D7

1161

—R74—

IC-21

—836-

-R65—

Ca

C-16

C13

IC

14

1

R68

IC-13

—R69—

,c

g

IC

1?

—R49—

c

—R52—

024>I

3

—R51—

E E

—R48—

B<

02

3

,

-

02

C

98

—R4E—

E E

—R47—

g<022

—R45—

IC -19

—R55—

c

—R39—

—R54—

Q26>

—R56—

E

-

B<E125

—R41—GlE>13

—R42

— E E

C17

—R43—

8.<019

—R

37—

C

18

—R57—

R72

1173

—D17--

III

C

BE

029

—018--

I l

CBE

031

IC-18

—R38—

— R

64

—

IC-3

C6

¡Cl

C7

118

C22

34---

-R32—

IC-2

—R29—

1163

—1133-

016

t

—R31-

017

C5

E\./

C

C\/E

—R28—

_

R27—

06

—R25—

—R26-

014>B

C

C21

EK

E

C115

012

C20

CN/E

13

1123

1122

013

R24

I

i—

R21-

1

—R18—

—R19-

09

1

—4217—

011

EN/C

I g

CN/E

—R15—

D4

—R16—

13

C i —

Ci

07>B

I

C3

o8NBC25

/ I

R6

I

R7

I

—R1—

,E

C2

—R

14—

E

—T-19—

C10

8

c

/NE

—R13—

06

05

—n11--

—R

12—E

\./C

B

04

I

_,

03

—R5—

I

E•\,,P--

,,,

E \B

/C

R4

B

'''''

02

s

I \

./

C

D<Q1

!

B

—

R2—

G

113

Cl

I I I

D1

ID?

Il

(Viewed

from

component

side)

•

Page

13

•

INTEGRATED

CIRCUIT

BASE

DIAGRAMS

IC

- 1

OUTPUT

V+

NULL

INPUT

741

HIGH

GAIN

OP AMP

-

IC-11

2 2 2

CLEAR

CLOCK

PRESET

IC

-

2,18,

I9

SD

A TA DA E V

EE

DB TB

SD

B

CD

A QA QA

Vcc

QB QB

CD

B

EC

L

95

H

28

DUAL

D

FLIP-FLOP

Vcc

1

10

1

10

1E)

GND

CLOCK

1

PRESET

7474

DUAL

D-TYPE

EDGE-TRIGGERED

FLIP-

FLOP

Vcc

IC

-

15

IC

-

12,

13,

17

GND

7402

QUADRUPLE

2-INPUT

POSITIVE-

NOR

GATES

IC

- 3

VE E

vcc

ECL

95H03

TRIPLE

OR/NOR

GATES

Vcc

7438

ONO

Q

UADRUPLE

2-1

NPUT

POSITIVE-NAND

B

UFFERS

IC-

16

V

CC

46

4,4

4Y

3B

3A

3Y

IC-

14

GND

1A

GND

MC

3003P

QUADRUPL

E

2-

INPUT

POSITIVE

-OR G

AT

ES

74132

Q

UA

D

RUPL

E

2-

INPUT

POSITIVE

NAND

GAT

ES

[

SCHM

ITT

TRIGGE

R]

Page

14

•

IC

-

21

O

SC

F

EED

V

GG

V

SS

A B C D O

UT

BACK

16

J

1JTU413121TLii6U9

-

L_

TIME

v„

EXT

R

IN

R

OUT

,.

IN

D

SE

L 1

MK

5009

P

OSCILLATOR

-

SCALER

-

MULTIPLEXER

]

1

2fl

3

fl

4fl

5fl

6 n 7

11s

IC-

23

NC

OSC

IN

R

EXT/

VCC

CE

XT

NC

CE

XT

NC

R

INT

Cl

r

DATA

INPUTS

7412

2

RETRIGGERABLE

MONOSTABLE

MULTIVIBRATOR

WITH

CLEAR

IC

-

22

Q

GND

K

CL

OC

K

CLEAR

K V

CLOCK

CL

E

AR

J

7473

DUAL

J-K

MASTER

-

SLAVE

FLIP

-

FLOPS

^u

—'

_n_....,

IC

-

24,25,26

> O

UTPUT

-.-

CO

MM

ON

INPUT

UA

7805

5-

VOLT

VOLTAGE

REGULATOR

•

SNAL

INPuT

70

SENSItv/T

swiTCK

ORG

SI-B

or

7

PovIER

ORG

FI

1/71

A

T25

v

•

x

QI

7,

5.6

V

520

C)

Q7

C)

Q9

CD

08

E"

-

º1

-e

03

R7

,4

360

RED

SENSITIVITY

CONTROL

TO

POWER

SW

IT

C

IT

c

6000

RR

000

SI-C

05

6

029

.5V

SOURCE

:,PuT

AND

.ST

DCU

5V

SOURCE

TO

DISPOS

5V

SOURCE

TO

CONTROL

15V

SOURCE

5V

SOURCE

2V

SOURCE

5.dr

LEVEL

CONTROL

21

o

TESTPO

NT

C-26

'

00

IC

3B

LSD

IC-4

IC-6

TTC

MEMORY

IC-7

IC-8

IC-9

•

')

IC

I2>

o

ál'eo?

IC-I8B

56

3

IC

196

ECL

VISE

6

021

022

kre

VA!

270

s

023

e

IC

I9A

E 0

R53

RS2 270

2

025

3

IC-I8A

=19

26

TRANSLATOR

AND

FIRST

DCU

IC-3A

7*0

CD

TABLE

II

TB.

7

RANGE

TIME

BASE

(

GATE

INTERVAL)

200.031.15

4—

30

5

H200

MS

.6—

30

Cl

S

CLOCK

GATE

CONTROL

MEMORY

MOLD

07

7

RESET

TL

RESET

•

MSD

e 5

OVERRANGE

CIRCUIT

IC-IIA

L.

r

RESET

-

MEMORY

CONTROL

3D

IC-

I5D

•

IC

-

155

c(IC-

I4B

lo

IC-I4A

kj

eC-

I4A

e

IC-I2C

IC

o

I2C

027

L I

AUTO

RESET

IC-

I6A

RESET

MONOS

TABLE

•,5

C6

0.05

IC-

'

I6B

pe

IC-

I2D

AUTO

STEP

GAT

E

7c1:7R

-

cil

-----------

IC-2A

GATE

CONTROL

o

cc,

IC-

3C

6

i0

.5

-1

15

'

RF

%1

LOT

OSE.

INPUT

r-2

PSI

70

OYI

CLOC

IC-2I

IC-

I6D

F

--4"

RO5

270

MEMORY

MONOS

TARS.

IC-22A

IOL

IC

23

meeT2z,

:le'

3

O•

-

HOLD.

OFF

5

IC

2

2B

. •

AUTO-RANGING

CIRCUIT

iNT

OSCILLATOR

.

52

LOT

TABLE

I

TB

A

10s

I s

0.1s

0.015

O

6

IC-

I4C

L2

KM

IC-

I4D

L3

MHz

7

IC-

I3A

IC-I

IB

o

OR

o

SIA

RANGE

IC-

I3C

INVERTED

RESET

SCHEMATIC

OF

THE

SM-128A

AUTO

-

RANGING

FREQUENCY

COUNTER

NOTES:

(1)

ALL

CAPACITORS

IN

9F

UNLESS

OTHERWISE

INDICATED.

(2)

ALL

RESISTORS

IN

OHMS

UNLESS

OTHERWISE

INDICATED.

(3)

(4)

SWITCH

S1

IS

ILLUSTRATED

ELECTRICALLY.

DC

VOLTAGE

PRESENT

AT

THESE

POINTS.

(5)

*

DC

VOLTAGE

IS

DEPENDENT

ON

THE

FET

AND

WILL

VARY.

(6)

SIGNAL

LINES

OF

INTEREST

ARE

LABELED

AS

TO THE

IR

FUNCTION.

(7)

TABLE

1

LISTS

STATUS

OF

CLOCK

CONTROL

LINES

A

AND

B

FOR

VARIOUS

RANGES

vs

TIME

BASE

(TB).

(8)

WIRES

ARE

LABELED

AS

TO

COLOR.

(9)

TABLE

II

SHOWS

PERTINENT

WAVEFORMS

IN

RELATION

TO

EACH

OTHER

(NOT

TO

SCALE).

(10)

WAVEFORM

LOCATIONS

ON

SCHEMATIC.

(11)

OR

LEVEL

TRANSISTION

ACTIVATES

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

IC-4

ASSIGNMENTS

TIL308

LATCH

OUTPUT DB

(BINARY

WEIGHT

2)

LATCH

OUTPUT

Clc

(BINARY

WEIGHT

4)

LATCH

OUTPUT

OD

(BINARY

WEIGHT

8)

LATCH

OUTPUT

OA

(BINARY

WEIGHT

1)

LATCH

STROBE

INPUT

LATCH

DATA

INPUT

C

(BINARY

WEIGHT

4)

LATCH

DATA

INPUT

D

(BINARY

WEIGHT

8)

GROUND

NO

INTERNAL

CONNECTION

LATCH

DATA

INPUT

B

(BINARY

WEIGHT

2)

BLANKING

INPUT

LATCH

DATA

INPUT

DP

LED

TEST

LATCH

OUTPUT

DP

LATCH

DATA

INPUT

A

(BINARY

WEIGHT

1)

SUPPLY

VOLTAGE,

BOTTOM

VIEW

1

2

3

4

5

6

7

8

9

10

11

12

13

PIN 14

15

16

IC-6,

6, 7,

8,9, 10

ASSIGNMENTS

TIL306

LATCH

OUTPUT

OB

(BINARY

WEIGHT

2)

LATCH

OUTPUT

Oc

(BINARY

WEIGHT

4)

LATCH

OUTPUT

CID

(BINARY

WEIGHT

8)

LATCH

OUTPUT

GA

(BINARY

WEIGHT

1)

LATCH

STROBE

INPUT

RIPPLE-BLANKING

INPUT

MAXIMUM-COUNT

OUTPUT

GROUND

PARALLEL

COUNT

ENABLE

INPUT

SERIAL

COUNT

ENABLE

INPUT

RIPPLE-BLANKING

OUTPUT

CLEAR

INPUT

DECIMAL

POINT

INPUT

BLANKING

INPUT

CLOCK

INPUT

SUPPLY

VOLTAGE,

vcc

NUMERIC

DISPLAY

WITH

LOGIC

vcc

• • •

_

Schlumberger HEATH SM-128A User manual

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