Systron donner 6250a User manual

TELECOf

1

~

·

1

AUSTRALIA

RESEJ\RCH

LAPDRATORIES

APPARATUS

HISTORY

SHEET

RL

9878

COUNTER,

Frequency,

1'i.me.

Systron Dormer,

Type

6250A,

S/N

20005

Accessories

: 1 -

Power

Cord

[

This manual

contains

all

ECO's

through

#9454

1974

Systron-Oonner

Corporation

SVSTRDN

•E-111111111•®

DONNER

CORPORATION

Printed

in

U .S.

A.

\"\L

\OIU

INSTRUCTION

MANUAL

MODEL

6250A

COUNTER

TIMER

SERIAL

NO.

@

CONCORD

INSTRUMENT

DIVISION

10

Systron Drive •

Concord,

California

94518

• U.S.A.

Tel:

(415)

676

-

5000

•

TWX

:

910-481-9479

• Cable:

SYSTRONDONNER

FSCM

No

.

52542

B 0

e

NE

N

H

TE

ON

A

OPE

ON

MAINTE

IN

TABLE

OF

CONTENTS

(Cont'd)

CHAPTER

5 -

PRINCIPLES

OF

OPERATION

(Cont'd)

5.2

5.3

5.3.1

5.3.2

5.3.3

5.

3.

4

5.

3.

5

Logic

Devices.

. . . • . . . . . . . . · ·

Circuit

ue6cLiption

•..........

Mother

Baord,

Al,

Schematic

#7-0S3SSS01

Readout

Assembly,

A2,

Schematic

#4SS86-7-l

. . . . . . .

A

Amplifier,

A3,

Schematic

#7-0S3S7201

. . . . . . . .

B

Amplifier,

A4,

Schematic

#7-0S3S8401

. . . . . .

10

MHz

Osc~llator

Assembly,

AS,

Schematic

#45608-7-1

.....

.

CHAPTER

6 -

DRAWINGS

6.1

Introduction

. . . . . . .

053629

Test

Assembly

. . . . . . . . . . . . . .

053628

Rear

Panel

Assembly

. . . . . . . . . . .

7-053630

Wiring

Interconnect

Schematic

. . . .

7-053SSS01

Al,

Mother

Board

Schematic

(Sheet

1

of

2)

. . . . . . .

..

. . . . . .

7-053S5501

Al,

Mother

Board

Schematic

(Sheet

2

of

2)

. 0 . . . .

OS3SS501

Al,

Mother

Board

Assembly

. . . . . .

45586-4-1

A2,

Readout

Assembly

. . .

4S586-7-l

A2

,

Readout

Schematic

. . . .

053S7201

A3,

A

Amplifier

Assembly

. . . . . . .

7-05357201

A3,

A

Amplifier

Schematic

. . . .

05358401

A4,

B

Amplifier

Assembly

. . . . . . . . .

7-0S3S8401

A4,

B

Amplifier

Schematic

. -3 . .

45608-4-1

AS,

10

MHz

Oscillator

Assembly

. . . . . .

45608-7-1

AS,

10

MHz

Oscillator

Schematic

. . .

CHAPTER

7 -

PARTS

LISTS

7.1

Introduction

. . . . . . .

7.2

Manufacturer's

Index

. . . . .

OS3630

Final

Assembly

. . . . . . . .

053SS501

Al,

Mother

Board

Assembly

. . . . . .

4SS86-4-l

A2,

Readout

8

Digit

Assembly

. . .

053S7201

A3,

A

Amplifier

Assembly

. . . . . . .

OS3S8401

A4,

B

Amplifier

Assembly

. . . . . . .

4S608-4-l

AS,

10

MHz

Oscillator

Assembly

. . . .

CHAPTER

8 -

OPTIONS

8.1

Introduction

. . . . . . . . . . . . . . .

; v

Page

S-1

5-2

5-4

5-5

6-1

6-3

6-4

6-S

6-6

6-7

6-8

6-9

6-10

6-11

6-12

7-1

7-4

7-5

7-9

7-11

7-13

7-15

8-1

6250A-6-74

[

(

[

I [

[

TABLE

OF

CONTENTS

(Cont'd)

CHAPTER

8 -

OPTIONS

(Cont'd)

045836

045834

045841

04584901

04584902

04584903

053006

045787-4-1

Option

06

Internal

Battery

Operation

. .

Option

07

External

Battery

Operation

. .

Option

08

Oscillator,

Temperature

Stability

±1

Part

in

10

6

.......

.

Option

11

Oscillator,

Temperature

Stability

±3

Parts

in

10

9

••••••

Option

12

Oscillator,

±1

Part

in

10

9

Per

Day

. . • • . . • . . . . • . . •

Option

13

Oscillator,

±5

Parts

in

10

Per

Day

.

..

.

..

• .

..

.

..

. . . . .

Option

32

Rear

Signal

Inputs

. • . . .

Page

OPT

06/

OPT

07-1

OPT

08-1

OPT

11,

OPT

12,

OPT

13-1

OPT

32-1

OPT

35-1

Option

35

BCD

Cpnversion

Cable

Rack

Mount

Assembly

• . . . . . . ACCESSORY-1

CHAPTER

9 -

SUPPLEMENTAL

INFORMATION

9.1

Introduction

. • • 0 • • • • • • • • •

9-1

LIST

OF

FIGURES

Figure

3.1

Front

Panel

. . "

..

. " "

..

"

..

"

..

" .

3-3

3.2

Rear

Panel

.. ..

"

..

" " "

..

" " " " .

..

" "

3-3

3.3

Gating

Ambiguity

. .

..

. .

..

3-6

3

..

4

Triggering

Levels

.. ..

0 .

..

.

3-6

3.5

Spurious

Counts

Due

to

Noise

Transients

3-7

3 "6

Missing

Counts

Due

to

Amplitude

Modulation

" "

..

"

..

3-7

3

..

7 Mono

polar

Pulses

Intersecting

Only

One

Trigger

Level

.. ..

. "

..

. .

..

.

..

3-8

3.8

Ringing

On

Pulse

Waveform

Causes

Count

Error

.. ..

..

.

.. ..

.

..

.

..

"

.. ..

" "

..

3-8

3

..

9

Period

and

TIM

Triggering

Error

Caused

By

Signal

Noise

" "

..

.. .. ..

..

.

..

.

.. ..

"

3-9

3.10

Measurement

Error

vs

Frequency

3-9

5.1

Functional

Block

Diagram

..

5-2

5

..

2

Expanded

Time

Base

Timing

"

.. .. ..

5-6

5

..

3

Time

Base

Timing

..

. .

5-7

LIST

OF

TABLES

Table

1

..

1

Specifications

..

.

..

. .

..

1-1

1..2

Standard

Options

.

..

. .

..

" " . 0

..

1-4

3.1

Front

Panel

Functions

.

..

.

..

.

3-1

3.2

Rear

Panel

Functions

..

"

..

.

..

. .

3-4

4

..

1

Recommended

Test

Equipment

"

..

. .

4-1

7 "1

Code-to-Name

Cross-Reference

..

7-1

OPT

35

..

1

Rear

Panel

BCD

Connections

.. ..

.

OPT

35-1

6250A-6-74

v

1. 1

INTRODUCTION

This

tions,

test

and

schematic

drawi

The

instrument

is

Systron-Donner

ha

display.

An

eig

standard.

Al

b

re

cha

Maximum

the

operator

a

time

most

appropr

Light

weight

comb

anywhere.

A

as

a

power

1

1.

2

SPEC

PERIOD

Sine

6250A-6-74

N

HAPTER

INFO

TION

specifications,

operat

instruc-

parts

lists,

and

assembly/

Model

6250A

Counter/Timer.

sal

counter,

which

features

the

im

a

highly

readable

seven-se

leading

zero

blanking

is

lable

four-bit

parallel,

group-

on

a

rear

panel

connector.

In

counter

may

be

powered

by

an

internal

±

de

voltage

source.

ts

the

proper

range

to

pro-

the

frequency

being

measured.

second.

Manual

selection

of

s

,

enabling

selection

of

the

gate

applicationo

make

this

counter

usable

connectors

provide

for

use

unit.

specifications

for

the

Model

C F

ATIONS

to

5

MHz

0 Hz

in

100

Hz

steps

±

base

accuracy

µs

to

50

000

µs

to

999999.99

µs

l - l

TABLE

1.1

SPECIFICATIONS

(Cont'd)

PERIOD

MEASUREMENT

(Cont'd)

Resolution:

Automatic

Manual

Display:

TIME INTERVAL A~B

Range:

Resolution:

Slope

selection:

Display:

RATIO

MEASUREMENT

Function:

Range:

Multiplier

range:

Automatic

Manual

TOTALIZE

Rate

limits:

Register

capacity:

Control:

STANDARD

TIME

BASE

Aging

rate:

Temperature

stability:

1- 2

.01

µs

to

.0000001

µs

by

period

average

of

10

2

to

10

6

periods.

Automatically

searches

multiple

average

to

fill

register.

Selection

of

multi~le

period

aver-

age

from

10

1

to

10

periods.

Counts

10

MHz.

µs

with

autopositioned

decimal

point.

.0001

ms

to

9999999.9

ms

Manual,

.0001

ms

to

.1

ms

Independent

for

positive

or

nega-

tive

start

and

stop

inputs.

ms

with

autopositioned

decimal

point.

f A +

fB

f A;

20

Hz

to

50

MHz

fB;

20

Hz

to

1

MHz

100

to

10

6;

automatically

searches

multiple

average

to

fill

register.

10

to

10

6

20

Hz

to

50

MHz

10

8

events

Front

panel

switch

for

totalize/

hold

<±3

parts

in

10

7

per

month

<±5

parts

in

10

6

from

0°

to

50°C

(32°

to

122°F);

±2

parts

in

10

6

from

20°

to

40°C

(68°

to

104°F)

typical.

6250A-6-74

TABLE

.1

SPECIF!

ATION

(C

nt

d)

Line

Vol

External

GENERAL

Trigger

Registration:

Display

storage:

Sensitivity:

S

wave

input

Input

impedance:

Attenuation:

input

without

damage:

Power~

• 3 N

f

6250A

6-74

7

0%

ms

9

II

l 3

1-4

TABLE

1.2

STANDARD

OPTIONS

Option

Description

06

with

an

operating

07

08

*11

*12

*13

*32

35

*

Contains

an

Provides

operation

from

an

external

de

source

Time

base

oscillator;

improves

time

base

tempera-

ture

stability

to

±1

part

in

10

6

from

0

to

50°C.

Time

base

rate

±3

parts

10

9

per

day.

±1

part

10

8

from

0

to

Time

base

per

day.

from

0

to

Time

base

per

day

..

from

0

to

50°C

..

Rear

panel

BCD

conversion

outputs

into

including

Not

aging

rate

±1

part

in

stability

±1

part

aging

rate

±5

parts

stability

±1

part

in

converts

group-

8-

4-

2-

l

paral

legend

units

..

06

or

0

1010

8

6250A-6- 4

2.1

IN

RODUC

IN

The

and

the

2.2

REC

2 .

5)

6)

6250A

E

the

cond

damage

..

and

recei

shipping

car-

shipment.

of

controls,

your

nearest

COUNTER UNTIL

INSTRUCT-

ser

a

summary

on

all

sides

ional

movement

of

INSTRUi'ft.i.ENT"

to

en-

2 l

Be

certain

that

all

correspondence

refers

to

full

instrument

nomenclature

(model

and

serial

number)

.

2.4

POWER

REQUIREMENTS

6250A

Counter/Timer

a

standard

three-con-

power

cord,

which,

when

plugged

into

an

appropriate

power

re-

,

grounds

the

chassis

to

protect

operating

personnel

from

electrical

hazards.

When

the

power

cord

is

mated

to

a

two-

conductor

outlet,

a

cord

adapter

plug

( )

will

pro-

same

protection.

trument

operates

from

either

0,

115,

200,

or

230

V

at

50

to

and

consumes

approximately

19

W

of

Taps

on

the

primary

power

transformer

are

provided

to

accommodate

these

power

line

Use

a

0.5

A

fuse

for

100,

115

V

ac

and

a

0.25

A

fuse

200,

230

V

ac.

Test

Assembly

drawing

#053629

shows

the

of

trana

the

line

voltage

selection.

Prior

to

connecting

power

to

a

line

source,

ensure

that

the

transformer

jumpers

are

proper-

connected

for

the

available

line

voltage.

See

4,

Section

cover

removal

.

. 5

CIRCUIT

CHECK

operational

checkout

of

all

modes

is

contained

in

Chapter

4

4.4.

6250A-6-74

A R

OPE

ON

3. 1

INTRODUCTION

Front

and

rear

panel

controls

ed

in

this

chapter.

Figures

3.

panels

while

Tables

3.1

and

3 2

Information

covering

factor

a

step-by-step

operating

included.

3.2

FRONT

PANEL

FUNCTIONS

Table

3.1

descr

s

the

control

front

panel

of

the

instrument

number

location.

Index

1

2

3

TABLE

3.1

Name

LINE

BATT

RESOLUTION

AUTO

MAN

4

RATE

descr

measurement

accuracy

descr

and

rear

of

the

operat

is

6250A-6

74

3-1

3-

BLE

3.1

F

ndex

Name

5

TIM

A+B

6 PERIOD B

7 RATIO

A+B

8

TOTAL

A

9 RESET

10

11

2

13

14

15

16

INPUT A

20

Hz -

50

MHz

1

Mrl

SLOPE

ATTEN

LEVEL

ATTEN

0

se-

B

se-

on

I

[

I

!

l

\

16

17

18

19

20

21

15 14

2 3 4 5 6 7

FIGURE

3.1

FRONT

PANEL

8 7 6 5 4

+ .

f)y

-

ET

IA'fT

.

2

FIGURE

3.2

REAR

PANEL

22 23

13 12

8 9

10

11

3

6250A-6-74

3-3

TABLE

3.

1

FRONT

PANEL

Index

Name

17

LEVEL

over

..

18

OFF-SCALE

19

GATE

LED

20

Readout/Digits

21

KHz

22

ms

LED

FUNCTIONS

(Cont'd)

script

ion

controlling

a

trigger

level

PRESET

position

centers

approximately

zero

cross-

when

the

readout

lights

when

gate

is

f

eight-digit

readout;

measurement

data

with

..

5

uni

ts

(kHz)

Does

not

is

depre

mode

(TIM

A~B)

the

uni

ts

(ms)

and

lit.

23

µs

LED

mode

3.3

REAR

PANEL

FUNCTIONS

The

following

table

describes

panel

of

the

instrument.

Refer

to

location.

TABLE

3.2

R R

Index

Name

the

uni

ts

(

µs)

and

lit.

s

and

connectors

on

rear

3..

index

number

NEL

FUNCTIONS

cription

1

Power

Plug

Socket

Connects

to

2

Fuse

Holder

3

HOLD/NORM

10

MHz

5

INT/EXT

time

6250A-6-

4

TABLE

3.2

REAR

PANEL

FUNCTIONS

(Cont'd)

Index

Name

Description

6 A

AMPL

B

Option

32;

BNC

connectors

accept

rear

panel

input

of

both

"A"

and

"B"

mea-

surement

data.

7

OSC

ADJ

Oscillator

adjustment

available

on

rear

panel

when

an

optional

high-stability

oscillator

is

installed.

8 6 V

EXT

BATT

Connectors

for

an

external

battery

when

option

07

is

installed.

9

BCD

Card

edge

connector;

provides

serial,

four-bit

parallel

BCD

information.

3.4

ACCURACY

OF

MEASUREMENT

There

are

certain

factors

inherent

in

any

digital

counter

which

may

cause

measurement

errors.

Close

attention

to

control

settings

and

proper

operation

will

reduce

these

errors

to

a

minimum.

3.4.

1

Oscillator

Stability

The

gating

precision,

and,

therefore,

the

accuracy

of

the

count,

is

dependent

upon

the

stability

of

the

internal

oscillator.

In

the

standard

instrument,

the

oscillator

is

initially

set

to

within

±1

part

in

10

7

of

a l

MHz

frequency

standard

having

at

least

an

order

of

magnitude

higher

stability.

Deviation

of

the

oscillator

from

this

frequency

then

becomes

a

func-

tion

of

several

factors;

the

most

significant

being

time.

Due

to

certain

processes

in

the

frequency

determining

elements

of

the

oscil-

lator,

an

"aging"

rate

is

established

that

can

be

measured

and

speci-

fied

for

the

oscil

This

aging

rate

is

specified

to

be

less

than

±3

parts

in

10

7

per

month.

Generally,

this

aging

rate

decreases

with

time

(providing

the

instrument

remains

continuously

energized)

•

The

error

due

to

oscillator

instability

may

be

estimated

from:

Max %

error

=

(±3/10

7 X

M)

X

100

where;

M

is

the

number

of

months

since

last

calibrated.

Oscillator

stability

is

also

a

function

,of

line

voltage

and

tempera-

ture.

To

achieve

the

highest

accuracy

of

measurement,

the

following

considerations

apply:

1)

Maintain

the

instrument

plugged-in

and

continuously

energized.

2)

Maintain

constant

environmental

conditions.

3)

Monitor

or

regulate

line

voltage.

4)

Calibrate

instrument

at

intervals

consistent

with

maximum

al-

lowable

error.

6250A-6-74

3-5

As

counted;

I

st

MEASUREMENT~

5

FIGURE

3.3

GATING

AMBIGUITY

fl

GURE

r

ve

t

3-6

ect

to

an

irreduc-

of

the

display

..

not

coherent

gate.

of

the

input

during

se-

error

due

to

ss

significant

percentage

of

pulses

selected

time

gating

of

UTP

- - - - - - - - - - -

L

TP

- - - - - - - - - - -

(\

REF

_

__..

__

v---

TRIGGERING

LEVELS

nominal

levels;

s

to

complete

reference

It

analysis

a

variety

6250A-6-74

of

situations

leading

to

inaccurate

counting

and

some

poss

tions.

solu-

Ul

P

Ll

p

1)

2)

PROBLEM:

Spurious

counts

from

superimposed

noise

trans

of

suf

ient

amplitude

to

cross

trigger

levels,

(Figure

3.

5)

.

PROBLEM:

Missing

count

due

to

amlitude

modulation

of

input

signal,

(Figure

3.

6)

.

NOJ

SL

TRA:;s I

ENTS

FIGURE

3.5

SPURIOUS

COUNTS

DUE

TO

NOISE TRANSIENTS

3)

PROBLEM:

Monopolar

sect

only

one

level

(Figure

3.7).

4)

PROBLEM:

POSSIBLE SOLUTIONS:

a.

Adjust

LEVEL

control

for

trig-

gering

on

steepest

portion

of

signal

slope.

b.

Provide

attenuation

(either

in-

ternal

or

external)

to

reduce

noise

peaks

below

trigger

hys-

teresis

..

c.

Connect

low-pass

filter

between

signal

source

and

instrument

input.

POSSIBLE SOLUTION:

a.

Adjust

LEVEL

control

for

trig-

gering

on

steepest

portion

of

slope.

Modulated

signal

must

be

of

sufficient

amplitude

to

cross

through

both

trigger

levels.

1.JTP

LTP

RU

FIGURE

3.6

M!SSING

COUNTS

DUE

TO

M\PLITUDE

MODULATION

POSSIBLE SOLUTIONS:

a.

Offset

LEVEL

control

so

that

pulses

intersect

levels.

Pulse

amplitude

must

be

greater

than

hysteresis

value.

b.

Externally

differentiate

the

pulses.

POSSIBLE SOLUTION:

Ringing

on

leading

and

a.

Properly

terminate

input

signal

cable

at

INPUT

connector

on

front

panel

of

instrument

trailing

edges

of

signal

pulse.

Usually

a

result

of

mismatch

between

strument

input

and

signal

source

when

source

impedance

is

50

or

75

Q

(Figure

3.8).

6250A-6-74

(usually

a

50

or

75

Q

termina-

tion

in

shunt

with

INPUT)

..

3-7

I

L

TP

FIGURE

3.

7

MONOPOLAR

PULSES

INTERSECTING

ONLY

ONE

TRIGGER LEVEL

N

UTPl--

-V·

- -

----

LTP - - - - - - -

~

REF

FIGURE

3.8

RINGING

ON

PULSE

WAVEFORM

CAUSES

COUNT

ERROR

count

gating

error

is

small

,

however,

the

error

in

Section

3.4.2

and

is

in

3.10

for

different

a

factor

of

ten

increases

limit

of

the

oscillator

accuracy

base,

when

measuring

a

100

to

±1

part

in

10

3

or

0.1%.

For

measurement

is

used

for

greater

accura-

one

complete

cycle

of

measures

the

time

of

lOn

displays

the

average

triggering

of

the

of

the

input

wave.

midpoint

or

measurements

are

subject

to

a

signal

(Figure

3.9).

signal

with

a

ideal

signal,

instant

for

stop

for

a

ideal

signal

at

T

is

the

actual

the

maximum

as:

6250A-6-74

At

signal

frequenc

s

the

effect

of

the

±1

count

time

base

guity

is

additive

to

the

triggering

error

as:

f

± s

Nf

TB

where

=

signal

frequency

(Hertz)

base

frequency

(

10

MHz

in

this

instrument)

Thus,

the

total

maximum

error

in

a

period

measurement

± Vn +

The

horizontal

curves

3

10

are

plotted

to

show

this

error

for

N

from

1

to

10

5

and

assume

a

typical

signal

to-noise

ratio

o

40

dB

(100:1)

a

time

base

frequency

of

10

MHz

By

using

both

sets

of

curves,

figure

shows

type

of

measurement

(frequency

or

period)

will

y

ld

the

lowest

gating

SIGNAL

+

PEAK

NOISE

i I

PEAK-TO-PEAK

NOISE

'r~-

·1

1/;"

_1-t-,;~_

1

-'~-+;\,-----vs

--+/_,_~

1

__

TA

IGGER

I{

\~\

/I

LEVEL

lti

\\ .

1/

)/I

\\1~

i

'(I

- ; I

! :-- T .

SIGNAL-PEAK

NOISE

t =

MAXIMUM'

POSSIBLE

ERROR

<>

~

,

io·'

~~.:;.:.:.;.,:;:.:.....:..:.~__,--

>-

z:

;;..:

~

±lo·'

1--------1----1--~"-.--~J'(---?>!'<:-.;;--~("I

<(

:>::

FIGURE

3.9

PERIOD

AND

TIM

TRIGGERING ±1

o·'

'-------''---------'--------~---1

100

Hz

1 kHz

10

kHz

100

kHz 1

MHz

l 0

MHz

ERROR

CAUSED

BY

SIGNAL

NOISE

MEASURED

FREQUENCY,

fs

V

Assur.ies

10

MHz

Time

Base

and

4C

dB

signat-to-no-:.'se

ratio.

3 5

OPERATING

PRO

EDURES

FIGURE

3.

l 0

MEASUREMENT

ERROR

vs

FREQUENCY

The

Model

6

modes;

RATE

A,

TIM

A~B

PERIOD B

RATIO A+B,

and

TOTAL

A

RATE

A

measures

frequencies

from

0 Hz

to

50

MH

TIM

A+B

measures

the

inputs

to

the

and

B

connectors.

PERIOD

measures

of

the

B

RATIO

A+B

measure

ratio

of

and

B

inputso

TOTAL

A

count

of

to

automatic

selection

used

for

1

opera-

A+B

Manual

re

must

be

s

Ensure

transformer

jumpers

are

correct

for

the

input

Zine

voltage

be

re

operating

the

instrument.

See

Test

As

draw-

#0536

9o

3 5 e 1

Rate

A

Mea

20

Hz

to

50

MHz,

use

6250A 6

74

3-9

SYSTRON DONNER 6250A User manual

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