Philips PM 6670 Bedienungsanleitung

Dieses Handbuch passt für folgende Modelle

2

Inhaltsverzeichnis

Andere Philips Kasse Handbücher

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Delfield

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CardTronics

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Timer-Counters

PM

6670.

.

.72

Operating

Manual

PHiUPS

«

'

tufwasB

itm

,

ac

m

A-

-A

PHILIPS

important

As

the

instrument

is

an

electrical

apparatus,

it

may

be

operated

only

by

trained

personnel.

Maintenance

and

repairs

may

also

be

carried

out

only

by

qualified

personnel.

Please

note

In

correspondence

concerning

this

instrument,

please

quote

the

type

number

and

serial

number

as

given

on

the

type

plate.

Contents

1.

Technical

specification

4

2.

Installation

instructions

9

3.

Operating

instructions

10

Frontpanel

controls

10

Rear

panel

controls

11

Theory

of

measurements

12

Practical

measurements

18

4.

Performance

check

21

Bedienungsanleitung

25

Table

des

matieres

47

©Philips

Export

B.V.

—

Eindhoven

—

The

Netherlands

—

1984.

Printed

in

Sweden

1.

Technical

Specification

Measuring

modes

Frequency

Range:

0,1

Hz.

.

.120MHz

(PM

6670,

6671).

0.1

Hz.

.

.1GHz(PM

6672).

Mode:

Input-signal

synchronized,

high

resolution

computing

measuring

method

(reciprocal).

Signal

mode:

ON.

SINGLE

BURST,

MUL

TIPLE

BURST

FREQUENCY

AVERAGE.

In

the

FREQUENCY

AVERAGE

mode

(rear

panel

selectable),

the

counter

measures

the

average

of

a

multiple

of

frequency

samples.

Samples

are

taken

with

external

gate

control

(s^soons)

and

totalized

during

the

selected

measuring

time

(10ms.

.

.96s)

to

allow

multiple

burst

frequency

measurements

or

to

sample

frequency

sweep

profiles.

LSD

displayed:

10"'Hz.

.

.10^Hz(PM

6670,

6671).

10-'Hz.

.

.10<Hz(PM

6672),

de

pending

on

measuring

time

and

input

frequency.

At

least

7

digits

displayed

per

second

of

measuring

time.

Resolution:

LSD*.

Inaccuracy

(rel.error):

.

resolution

.

trigger*

error

:

rel

FREQ

base

error.

measuring

time

.

time

Period

average

Range:

100ns.

.

.100s

LSD

displayed:

10"'^.

.

.10"®s,

depending

on

measuring

time

and

period

duration.

At

least

7

digits

displayed

per

second

of

measuring

time.

Resolution:

LSD*.

Inaccuracy

(rel.error):

.

resolution

trigger*

error

:

rel

PERIQD

base

error.

measuring

time

Time

Interval

A

to

B

;

single

Range:

100ns.

.

.10®s.

LSD

displayed:

10''s.

.

.10°s.

Resolution:

LSD*.

Inaccuracy

(rei.error):

±

resolution

±

trigger*

error

±

rel

TIME

INT

base

error.

.

time

Pulse

width

A

Pulse

width

measurements

are

similar

to

single

time

interval

measurements.

Both

start

and

stop

triggering

take

place

in

channel

A,

with

common

trigger

level

setting

and

automatic

trailing

edge

trigger

slope

inversion

with

respect

to

selected

leading

edge

trigger

slope.

All

other

specifications

are

identical

to

single

time

interval.

High

resolution,

pulse-

width

measurements

on

narrow

pulses

can

be

made

in

the

time

interval

average

mode

with

manual

selection

of

common

source

and

stop

slope

polarity.

Time

Interval

A

to

B;

average

Range:

0ns.

.

.100s.

LSD

displayed:

10''^s

. .

.10"®s,

depending

on

measuring

time

and

time

interval.

Resolution:

10-'s

VTJ

Inaccuracy

(rei.error):

4

ns

±

resolution

trigger*

error

TIME

INT

VTJx

TIME

INT

±

rel.

time

base

error.

Number

of

Intervals

averaged

(N):

Measuring

time

x

interval

repetition

rate.

Minimum

dead

time

from

stop

to

start:

300

ns.

Note:

Input

signal

must

be

repetitive

and

asynchronous

with

respect

to

the

time

base.

'

or,

1

LSD

unit,

whichever

is

greather.

.

time

Count

A

Totalize

range;

1.

.10",

with

indication

of

M-pulses

and

G-pulses

beyond

the

10®

display

range.

Pulse

pair

resolution:

80

ns.

Mode:

Manual:

Start-stop

by

DISPL.

HOLD

push

button.

Sequential

start-stop

periods

are

accumulated

or

individually

totalized

after

reset.

External:

Totalizing

interval

controlled

via

input

B,

selectable:

count

A

gated

during

pulse

duration

on

B

or

count

A

gated

between

start

and

stop

pulse

on

B.

Inaccuracy:

Pulse

repetition

rate

A

x

trigger*

error

B.

Phase

A—B

Phase

is

the

result

of

a

simultaneous

time

interval

average

and

period

average

measurement.

The

maximum

phase

range

is

therefore

limited,

due

to

the

300

ns

dead

time

between

stop

and

start

of

the

next

time

interval,

and

consequently

frequency

dependent.

For

phase

measure

ments

between

180°

and

360°

on

high

frequency

signals,

it

is

recommended

to

measure

the

complementary

phase

0°.

.

.

180°

by

changing

the

input

leads

(phase

B

to

A).

Phase

range:

0.1°.

.

.360°x

|1-(300nsx

FREQ)1

,

Example

0.1°.

. .

359.995°

at

50

Hz

0.1°.

.

357.3°

at

25

kHz

0.1°.

.

.

180°

at

1.666

MHz

Frequency

range:

0.03Hz.

.

.

1.6

MHz

LSD

displayed:

10"®

.

10'^

degrees,

de

pending

on

measuring

time

and

phase

difference.

„

.

..

10-'sx

FREQ

X

360°

Resolution:

-=

VTT

Inaccuracy

(rei.error):

^

4

ns

X

360°

x

FREQ

^

resolution

PHASE

~

PHASE

trigger*

error

x

FREQ

x

360°

Vrpx

PHASE

Number

of

Input

cycles

averaged

(N):

Measuring

time

x

FREQ

A.

Minimum

Input

signal:

100

mVfmg.

Phase

jitter

tolerance:

The

tolerated

phase

jitter

peak-value

?£

phase

difference,

i.

e.

phase

jitter

around

0°

should

not

cause

consecutive

measurement

results

of

slight

ly

above

0°

and

slightly

below

360?,

since

the

toltal

measurement

result

is

the

statisti

cal

average

of

all

individual

results.

Ratio

Range:

FREQA

0.

.

.10MHz

(all

models)

FREQ

B

0.

.

.10MHz

LSD

displayed:

10"'.

.

.

10°

Resolution:

LSD*.

Inaccuracy

(rei.error):

,

resolution

^

.

RATIO

trigger*

error

B..

Note:

Frequency

ratio

measurements

FREQ

A

(or

C)*_

0.01

Hz.

.

.120

MHz

(orl

GHy)

FREQD

50kHz.

.

.10MHz

can

also

be

made

in

the

frequency

mode,

by

making

use

of

the

external

reference

input

D.

However,

this

arrangement

does

not

give

correct

decimal

points.

**

Conly

on

PM

6672.

RPM

The

RPM

(revolutions

per

minute)

mode

is

similar

to

the

frequency

mode.

The

measured

frequency

is

multiplied

x

60,

before

being

displayed.

Range:

0.6

RPM.

.

.10°RPM

(with

one

pulse

per

revolution).

LSD

displayed:

10"'

RPM

. .

.

10°

RPM,

de

pending

on

measuring

time

and

RPM.

Resolution:

LSD*

Inaccuracy

(rei.error):

resolution

trigger*

error

±

rel

RPM

base

error.

measuring

time

.

time

'

see

definitions.

Input

and

output

specifications

Inputs

A

and

B

Frequency

range:

Decoupled:

0.

.120MHz

AC

coupled:

50

Hz

.

.

.120

MHz

Rise

time:

Approx.

4

ns.

Sensitivity:

Decoupled:

lOmVprps

sine

wave

or

30mVpp(0.

.

.75MHz).

20mVrms

sine

wave

or

60mVpp(75.

.

.120MHz).

AC

coupled:

lOmVrms-

-lOOrnVrms

sine

wave(50

Hz.

.

.75MHz).

20

mVcnig.

.

.

100

mVrrps

sine

wave(75.

.

.120MHz).

Attenuation:

x

1

/x

10

fixed.

For

frequency

related

measurements,

tfie

fixed

attenuator

can

be

used

in

combina

tion

with

the

continuously

variable

attenu

ator

x1.

.

.

xlO

(AC

coupled

position).

Noise

immunity/tiysteresis

band:

Decoupled:

approx.

20mVpp/200mVpp.

AC

coupled:

approx.

20mVpp.

.

.2Vpp.

Dynamic

input

voitage

range:

Decoupled:

30mVpp.

.

.5Vpp/

300

mVpp.

.

.

50

Vpp.

AC

coupled:

lOmV^ms

-

-SVrms/

100

mVrms

■ ■

20

Vrms-

Trigger

levei:

Decoupled:

-2.5V.

.

.-1-2.5V/

-25

V.

.

.-1-25

V.

AC

coupled:

fixed

OV;

level

control

acts

as

continuously

variable

attenuator,

which

is

more

suitable

for

frequency

related

measurements.

Trigger

level

output,

not

available

on

PM

6670:

Set

trigger

voltages

-2.5

V.

.

.-1-2.5

V,

avail

able

on

1

mm

jacks

at

the

front

for

moni

toring

of

set

trigger

level.

Trigger

indicators,

not

available

on

PM

6670:

Tri-state

LED

trigger

lights

to

indicate

trigger

status:

On:

trigger

level

is

too

low.

Blinking:

triggering

occurs,

input

signal

crosses

hysteresis

band.

Off:

trigger

level

is

too

high.

Coupling:

DC/AC

Impedance:

Approx.

1

MOhm//35pF,

inde

pendent

of

sep/com

switch

position.

Ct^annel

input:

Separate

A

and

B

or

common

A.

Noise

filter:

Switchable

50

kHz

Low

pass

filter

in

channel

A.

Noise

suppression

approx.

40dB

at

1

MHz.

Maximum

voltage

wittiout

damage:

DC;

300

V.

AC;

260

Vrms

al

-440

Hz

declining

to

12Vrms

a'

-1

MHz

(in

ATT

x

1

position),

260Vrms

(in

ATT

x

10

position).

input

C,

PM

6672

only

Frequency

range:

70MHz.

.

.1GHz.

Operating

input

voitage

range:

15mVrms.

.12Vr,ms(

70

MHz.

.

.800

MHz).

2o

mVpms.

.

.

12

Vrms

(800

MHz.

.

.

1

GHz).

Impedance:

50

Ohm

nominal;

VSWR

<2.

Coupling:

AC.

AM

tolerance:

98%,

minimum

signal

must

exceed

minimum

operating

input

voltage.

Maximum

voitage

without

damage:

12

Vrms;

overload

protection

with

PIN

diodes

Ext.

reference

and

Ratio

input

(channel

D),

not

available

on

PM

6670

Frequency

range:

1

kHz.

.

.10MHz.

Sensitivity:

500mVrms

Impedance:

Approx.

2

kOhm

Coupling:

Ac

Max.

voltage

without

damage:

25

Vrms

Note:

As

external

reference

frequency,

only

10

MHz

will

give

correct

decimal

point

and

unit

indication.

With

the

optional

frequency

multiplier

PM

9697

references

of

1

and

5

MHz

can

also

be

accepted.

Internal

standard

output

(channel

D),

not

available

on

PM

6670

Crystal

frequency:

10

MHz.

Output

level:

LS-TTL

compatible.

Output

impedance:

Approx.

400

Ohm.

Coupling:

DC.

Overload

protection:

Short-circuit

proof.

Ext.

arming/Freq-avg/

Reset

(channel

E),

not

available

on

PM

6670

A

3-position

rear

panel

switch

gives

choice

of

external

control

over:

ARMING:

In

this

position,

the

counter

is

prevented

from

starting

a

new

measure

ment

when

input

E

is

high.

A

high-to-low

going

pulse

arms

the

counter

to

start

a

new

measurement.

Note:

Arming

not

applicable

in

COUNT

A,

manual

mode.

FREQUENCY

AVERAGE:

Frequency

measurements

(max.

100MHz)

and

period

measurements

are

interrupted

when

input

E

is

high.

The

measurement

is

con

tinued

again

when

input

E

is

low.

Each

individual

frequency

sample

must

contain

at

least

20

pulses

(FRED

mode)

or

2

pulses

(PERIOD

mode).

The

effective

measurement

time

(defining

resolution

and

accuracy)

is

the

sum

of

external

gate

times

that

occurs

during

the

selected

measurement

time.

EXT.

RESET-START:

Electrical

reset,

equivalent

to

the

front

panel

RESET

push

button.

(See

HOLD

and

RESET).

Counter

is

reset

when

input

E

goes

high.

A

new

measurement

can

be

made

after

input

E

has

returned

low.

input

ieveis:

High:

'^

2\/.

Low:

=£0.5V.

Input

impedance:

Approx.

2kOhm.

Max.

input

voltage

without

damage:

±25

V

Minimum

puise

duration:

Arming

and

frequency

avg:

500

ns.

External

reset:

200>js.

Gate

monitor

output

(rear),

not

available

on

PM

6670

The

gate

status

monitor

output

permits

observation

on

an

oscilloscope

of

the

measured

time

interval

and

the

trigger

hold-off

time

(PM

6671

only).

Output

level:

Main

gate

open:

approx.

0.4

V.

Hold-off

active:

approx.

1.2

V.

Main

gate

closed:

approx.

2.5

V.

Output

impedance:

Approx.

1.5

kOhm.

Delay:

Internal

delay

between

actual

trig

gering

and

gate

monitor

output

is

approx.

150

ns.

Overload

protection:

Short

circuit

proof.

Auxiliary

functions

Measuring

time

The

measuring

time

is

"continuously"

vari

able

(33

steps/decade):

10ms.

.

.96s.

with

clear

setpoints

at

10ms,

100ms,

Is,

10s

and

96s.

Selected

measuring

time

is

dis

played,

without

any

delay,

when

depres

sing

the

measuring

time

control.

The

actual

measuring

time

equals

the

selected

measuring

time

plus

the

time

needed

to

synchronize

the

measurement

with

an

integer

number

of

cycles

of

the

input

signal

(Reciprocal

measurements

are

synchronized

with

multiples

of

10

in

put

cycles).

In

the

FREQUENCY

AVERAGE

mode,

the

measuring

time

can

be

externally

con

trolled

to

make

burst

frequency

average

measurements.

Hold-off

PM

6671

only

With

trigger

hold-off

activated,

the

counter

ignores

re-triggering

(channel

A)

or

stop

triggering

(channel

B)

during

the

set

hold-off

time.

The

hold-off

time

can

be

digitally

measured

by

pressing

CHECK.

Applicable

in

all

time

modes.

Range:

200>js.

. .

200

ms,

in

period,

time

interval

arid

pulse

width

mode,

the

set

hold-off

time

is

visible

with

CHECK

de

pressed.

On/off

indication:

LED

indicates

when

hold-off

is

activated.

Monitor:

The

selected

hold-off

duration

can

be

made

visible

via

the

gate

monitor

output

On

Stand

By

In

"ST

BY"

position,

power

is

available

to

maintain

an

ovenized

crystal

oscillator

heated

and

to

recharge

the

optional

bat

tery

pack.

Check

10

MHz

internal

reference

connected

to

logic

circuitry.

Self-test

of

most

measuring

functions

can

be

selected.

By

using

this

mode,

the

COUNT

function

provides

a

stop-watch

facility

Display

hold

Depressing

"DISP

HOLD"

button

sets

display

time

to

infinite

and

freezes

the

last

measurement

result

A

new

measurement

can

be

initiated

using

reset.

In

the

COUNT

mode,

the

"DISP

HOLD"

control

is

used

to

start

and

stop

manual

totalizing.

Reset

Manual

via

pushbutton

or

electrical

via

input

E.

General

Display

Read

out:

8

digits,

7,6

mm

high-efficiency

LED's.

Microprocessor

control

of

display

format,

decimal

point

and

unit

indication:

Hz,

kHz,

MHz,

GHz,

ns,

ps,

ms

and

s.

Display

lime:

Continuously

variable

80ms.

.

.96s

plus

DISP

HOLD.

Gate

lamp:

Indicates

that

main-gate

is

opened

and

measurement

takes

place.

ST

BT:

Stand-by

indication

with

LED

when

instrument

is

not

switched

ON.

REMOTE:**

Indicates

when

control

over

counter

is

taken

by

the

installed

BUS

interface

option

(lEC

625

—

IEEE

488).

Low-battery:**

Indication

by

blinking

display

some

15

min.

before

recharging

is

needed.

Power

requirements

In

addition

to

the

normal

line

voltage

supply,

the

PM

6671

and

PM

6672

can

also

be

powered

from

an

optional

battery

pack

or

external

DC

voltage.

Line:

115/230V

±15%;

45.

.

.440Hz;<25

VA,

Internal

battery

unit:**

PM

9693.

External

DC

Cource:**

Voltage:

11

8V.

28V;

4.5.

8W

depending

on

version

and

options

installed.

Connector:

Battery

jack

fitting

DIN

45323.

Line

interference:

Below

VDE

0871

(B)

and

MIL

STD461

Safety:

According

to

I

EC

348

and

CSA

556

B.

**

not

available

on

PM

6670.

Dimensions

and

weight

Width:

210

mm

(8.25

in)

Height:

89

mm

(3.8

in).

Depth:

280

mm

(11.0

in).

Weight:

Net:

approx.

2.5

kg.

Shipping-

approx

3.6

kg.

Environmentai

conditions

Temperature:

Rated

range

of

use:

—

5°C.

. .

+

50°C

Storage

and

transport:

—

40°C.

.

.

+

70°C,

Humidity:

Operating:

10

.

90?/,

RH,

no

condensation.

Storage:

5

,

95%RH.

Altitude/Barometric

pressure

Operating.

5000m(15000ft)-53.3kN/m7

Storage:

15000

m

(50000

ft)-

15.2

kN/m^.

Vibration

test:

According

to

I

EC

68

Fc.

Bump

test:

According

to

lEC

68

Eb

Handling

test:

According

to

lEC

68

Ec.

Transport

test:

According

to

NLN-L88

For

TIME

INTERVAL

AVG:

LSD

2.5

X

10"'S

Definitions

LSD

displayed

Unit

value

of

Least

Significant

Digit,

displayed.

For

FREQUENCY,

PERIOD

AVERAGE,

RPM

and

PHASE:

2.5

LSD

X

=

measuring

time

FREQ

or

PERIOD

or

RPM

or

360°

10'Hz

For

RATIO:

LSD

=

_

2.5

X

prescaling

factor

(P)

x

RATIO

measuring

time

x

FREQ

A

or

C

(P)

=

1

Channel

A,

all

models

(P)

=

256

Channel

C,

PM

6672.

For

SINGLE

TIME

INTERVAL

and

PULSE

WIDTH:

LSD

=

100ns

(for

times

<10s).

LSD

=

(for

times

^i^lOs).

10®

meas.

time

x

time

int.

rep.

rate

in

Hz

All

calculated

LSD

s

shall

be

rounded

to

nearest

decade

(e

g

5

ns

will

be

10ns

and

0.4

Hz

will

be

0.1

Hz)

and

cannot

exceed

the

8th

digit

Resolution

For

multiple

event

measurements:

FREQUENCY.

PERIOD

AVERAGE,

RPM

and

RATIO,

the

resolution

is

the

smallest

increment

between

two

measuring

results

being

most

often

1

LSD

unit.

Due

to

arith

metic

truncation,

the

resolution

can

be

2

LSD

units

if:

LSD

X

measuring

time

FREO

oTp^RlOD

w'^M

or'RAT

10

but

can

then

be

reduced

to

1

LSD

unit,

by

doubling

the

measuring

time.

For

single

event

measurements:

PULSE

WIDTH

and

SINGLE

TIME

INTER

VAL,

the

measuring

resolution

is

100

ns

(one

clock

pulse)

The

counter

can

accu

mulate

up

to

10'®

clock

pulses,

of

which

only

the

8

most

significant

digits

are

shown

For

statistical

measurements:

TIME

INTERVAL

AVERAGE

and

PHASE,

the

measuring

resolution

is

the

smallest

increment

between

two

measuring

results,

with

confidence

level

of

95%.

Trigger

error

Trigger

error

is

the

absolute

measurement

error

due

to

noise

on

the

input

signal

causing

a

too

early

or

too

late

triggering

For

any

waveform

(FREO,

PERIOD,

RATIO,

RPM

and

PULSE

WIDTH):

peak-to-peak

noise

voltage

signal

slope

(V/s)

For

sinewave

(FREO,

PERIOD,

RATIO,

RPM):

1

FREO

X

TTx

S/N

ratio

Example:

For

S/N

ratio

of

100

(40

dB)

and

1

second

measuring

time,

the

trigger

.

.3x10"®

error

is.

For

separate

source

TIME

INTERVAL:

peak

noise

voltage

(input

A)

^

signal

slope

A

(V/s)

peak

noise

voltage

(input

B)

signal

slope

B

(V/s)

For

PHASE:

1

FREOx27r

1

X

1

S/N

ratio

(input

A)

S/N

ratio

(input

B)

Note:

S/N

ratios

calculated

with

peak-to-

peak

signal

and

noise

values.

Accessories

Supplied

with

the

Instrument:

•

Line

power

cord

•

Fuse,

1.6A

fast-blow

•

Front

cover

•

l\/lanual

To

be

ordered

separately:

PM

9678:

TCXO,

1

XlO-'/montti,

Included

in

version

/02.

PM

9679:

Proportionally

oven

controlled

oscillator

1

xiO'Vmonth.

Included

in

version

/03.

PM

9690:

Proportionally

oven

controlled

oscillator

1.5XlO-724h.

Included

in

version

/04.

PM

9691:

Proportionally

oven

controlled

oscillator

5

xi0''°/24h.

Included

in

version

/05.

PM

9693:

Battery

unit.

PM

9694:

BCD

output

and

display

offset

unit.

PM

9695:

Analog

recorder

output

(DAG).

PM9696:

IEC625/IEEE488

BUS

interface.

PM

9483/50:

lEEE-to-lEC

adapter.

PM

9487/10:

IEEE

cable,

1

m.

PM

9487/20:

IEEE

cable,

2m.

PM

9487/40:

IEEE

cable,

4

m.

PM

9697:

External

reference

frequency

multiplier.

PM

8923:

120MHz,

1Mohm

probe

set,

1:1

and

1:10.

PM8943:

650

MHz,

50ohm/1

Mohm

FET

probe

set,

1:1-10-100.

PM

9639:

1.5GHz,

500ohm

probe

set

1:10.

PM

9581:

50ohm

feed-through

termination,

1W.

PM

9585:

50ohm

feed-through

termination,

3W.

PM

9074:

Coaxial

cable.

50ohm,

BNC

to

BNC,

1m.

PM

9588:

Set

of

15

coaxial

cables,

50ohm,

BNC

to

BNC.

5

cables

(20.7

cm),

4

cables

(40.5

cm),

3

cables

(60.3

cm),

3

cables

(198.6

cm).

PM

9669/01:

19"

rack

mount

adapter

to

fit

one

instrument.

PM

9669/02:

19"

rack

mount

adapter

to

fit

two

instruments,

PM

9672:

Carrying

case.

NOTE:

The

timebase

oscillators,

PM

9678,

-79,

-90

and

-91,

can

also

be

ordered

sepa

rately

for

later

upgrading

of

the

counters.

The

counters

can

not

simultaneously

be

equipped

with

more

than

one

of

the

follovi/-

ing

options:

PM

9693,

PM

9694,

PM

9695

and

PM

9696.

The

multiplier

PM

9697

can

only

be

instal

led

simultaneously

with

the

.'01

osci

llator.

In

702,

.

,705

versions

the

osci

llator

must

be

removed

before

a

PM

9697

can

be

plugged

in.

2.

Installation

Instructions

General

information

This

counter

has

been

designed

and

tested

in

accordance

with

lEC

Publication,

Safety

Require

ments

For

Electronic

Measuring

Appartus

For

Class

1

Instruments,

and

has

been

supplied

in

a

safe

condition.

The

present

manual

contains

information

and

warnings

that

shall

be

followed

by

the

user,

to

ensure

safe

operation

and

to

retain

the

counter

in

a

safe

condition.

Before

connecting

the

counter

to

the

line

(mains),

visually

check

the

cabinet,

controls,

connectors,

etc,

to

ascertain

whether

any

damage

has

occurred

in

transit.

If

any

defects

are

apparent,

do

not

connect

the

counter

to

the

line.

All

components

on

the

primary

side

of

the

line

transformer

are

CSA

approved

and

should

only

be

replaced

with

original

parts.

In

the

event

of

obvious

damage,

missing

parts

or

if

the

safety

of

the

counter

is

suspected,

a

claim

should

be

made

to

the

carrier

immediately.

A

PHILIPS

sales

or

Service

organisation

should

also

be

notified

in

order

to

facilitate

the

repair

of

the

counter.

External

battery

operation

(PM

6671

and

PM

6672)

For

field

applications,

PM

6671

and

PM

6672

can

be

operated

from

an

external

11

.8...28Vd(s

supply,

connected

to

the

EXT

BATT

socket.

Connecting

the

counter

to

both

the

line

and

an

external

battery

at

the

same

time,

gives

a

power

back-up

facility

that

maintains

heating

of

the

oven

oscillator

and

recharges

the

optional

internal

battery

pack

PM

9693

when

fitted.

Fuses

The

counter

is

protected

by

a

thermal

fuse,

located

in

the

line

transformer

and

a

secondary

fuse,

1.6A

fast-blow

(not

PM

6670)

on

PCB

U1.

Remove

the

line

plug

before

fitting

a

fuse.

Ensure

that

only

fuses

of

the

specified

type

are

used.

If

the

counter

is

set

for

operation

on

11

5V

line

voltage,

but

is

connected

to

a

220V

supply,

the

thermal

fuse

will

blow

im

mediately

to

protect

the

counter.

Grounding

The

counter

is

connected

to

ground

via

a

three-core

line

cable,

which

must

be

plugged

into

a

socket

outlet

with

a

protective

ground

contact.

No

other

method

of

safety

grounding

is

permitted

for

this

counter.

When

the

counter

is

brought

from

a

cold

to

a

warm

environment,

condensation

may

cause

a

hazardous

condition.

Therefore,

ensure

that

the

grounding

requirements

are

strictly

met.

Any

interruption

of

the

protective

ground,

inside

or

outside

the

counter

is

dangerous.

Line

extension

cables

must

always

have

a

protective

ground

conductor.

Opening

of

the

cabinet

The

counter

shall

be

disconnected

from

all

voltage

sources

before

it

is

opened.

If

adjustment

or

main

tenance

of

the

counter

with

the

covers

removed

is

inevitable,

it

shall

be

carried

out

only

by

a

qualified

person,

who

is

aware

of

the

hazard

involved.

Bear

in

mind

that

capacitors

inside

the

counter

may

still

retain

their

charge,

even

if

the

counter

is

discon

nected

from

all

voltage

sources.

Opening

of

the

cabinet

or

removing

of

parts,

except

those

to

which

access

can

be

gained

by

hand,

is

likely

to

expose

live

parts

and

accessible

terminals

that

can

be

dangerous

to

life.

Line

voltage

setting

Before

connecting

the

counter

to

the

line,

ensure

that

it

is

set

to

the

local

line

voltage.

On

delivery,

the

counter

is

set

to

either

11

5V

or

220V,

as

indicated

on

the

line

voltage

selector

on

the

rear

panel.

If

the

voltage

setting

is

incorrect,

set

the

line

voltage

selector

in

accordance

with

the

local

voltage,

before

connecting

the

counter

to

the

line.

Type

Thermal

fuse

1.6A

fast-blow

fuse

5x20mm

Service

code

number

4822

252

20007

4822

253

20022

Operating

position

The

counter

can

be

operated

in

any

desired

posi

tion.

A

fold-down

tilting

handle

can

be

rotated

and

locked

in

several

fixed

positions

by

first

depressing

the

knob

in

the

centre

of

each

hinge.

Front

cover

The

front

panel

controls

and

connectors

can

be

protected

by

a

plastic

snap-on

front

cover.

Cleaning

the

counter

covers

The

top

and

bottom

covers,

lacquered

with

suede

coating,

need

special

treatment

if

the

surface

gets

soiled.

The

3M

Company

has

developed

a

"Doodle

bug

Pad"

(Catalog

l^o.

8440)

which

when

soaked

in

water,

ethanol

or

common

household

cleaning

agent,

will

penetrate

holes

and

pores

to

restore

its

former

lustre.

Abrasive

cleaning

pads

will

result

in

surface

scratches.

Although

the

Nextel

suede

coating

is

ethanol

resistant,

it

is

susceptible

to

methyla

ted

spirit,

which

could

damage

the

surface

due

to

one

of

the

denaturing

substances

present.

10

3.

Operating

Instructions

PM

6671

high

resolution

timer/counter

120MHz

PHILIPS

TRIGGER

LEVEL

SENSITIVITY

O

MHi

O

GHi

-

Z

5V

OO

gate

MIN

POWER

CHECK

RESET

DISPL

HOLO

OOOO-

I

ON

M

ST

BY

MEASURING

TIME

PULSE

WIDTH

A

COUNT

A

MANUAL

TIME

INT

L-

SINCLE

A-B

AVERAGE

A-B

'

96s

PUSH

TO

READ

PERIOD

A

—

RPM

A

REMOTE

ATT

SLOPE

SOhHi

COM

SLOPE

ATT

kIO

FILTER

v<a

A

"L.

*10

PHASE

A-B

'

IN

DEGREES

RATIO

A/B

MAX

260V_,

KOKI

51

FRONT

PANEL

POWER

Supplies

power

to

the

counter

in

the

ON,

depressed

position.

In

the

ST

BY,

released

position,

the

counter

is

switched

off,

but

power

is

still

available

for

an

optional

oven

oscillator

and

a

rechargeable

battery.

A

decimal

point

marked

STBYindicates

the

stand-by

mode.

This

is

a

secondary

power

switch.

Even

in

the

stand-by

mode

the

counter

contains

live

conductors

and

parts.

The

line

cord

(mains

lead)

must

be

removed

to

disconnect

power

from

the

counter.

CHECK

When

depressed,

the

internal

10MHz

standard

signal

is

connected

to

the

logic

circuits.

In

conjunction

with

the

function

selector

rotary

switch,

CHECK

enables

a

self-test

of

most

measuring

functions.

RESET

When

depressed,

resets

the

counter

and

blanks

the

display.

On

release,

RESET

initiates

a

new

measurement.

DISPL

HOLD

When

DISPL

HOLD

is

depressed,

the

display

time

is

set

to

infinity.

A

new

measurement

can

be

initiated

with

the

RESET

push-button.

MEASURING

TIME

PUSH

TO

READ

The

measuring

time

can

be

set

between

10ms

and

96s

for

optimum

resolution

and

measuring

speed.

When

pushed,

the

set

measuring

time

is

displayed.

HOLD

OFF,

PM6671

only

During

the

set

hold-off

time,

the

counter

ignores

all

input

events

that

should

have

ended

the

measuring

cycle.

To

display

the

set

hold-off

time,

select

TIME

INT

SINGLE

A-B

and

press

CHECK.

Function

selector

rotary

switch

RPM

A

Sets

the

counter

to

perform

a

revolution

per

minute

measurement

on

the

signal

connected

to

input

A,

provided

that

the

transducer

sends

one

pulse

per

revolution.

FREQA

FREQ

A

or

C,

PM6672

only

Sets

the

counter

to

perform

frequency

measurements

on

the

signal

connected

to

input

A

or

input

C.

In

the

frequency

average

mode,

rear

panel

selectable

on

PM6671...72,

the

counter

measures

the

average

of

several

frequency

samples,

controlled

by

an

external

gate

signal

via

Input

E.

RATIO

A/B

Sets

the

counter

to

measure

the

ratio

between

signals

connected

to

input

A

and

B

up

to

10MHz.

To

obtain

full

frequency

range

on

PM6671

...72,

a

ratio

measurement

can

be

done

in

the

FREQ

A

or

C

mode

by

using

input

D

set

to

EXT

STD

IN.

However,

this

method

does

not

give

correct

setting

of

the

decimal

point.

PHASE

A-B

Sets

the

counter

to

measure

the

phase

(in

degrees)

between

signals

connected

to

input

Aand

B.

Max

frequency

is

1.6MHz.

The

sensitivity

knob

should

be

pulled

and

set

fully

clock-wise.

The

ATTxlO

push-button

should

be

released.

COUNT

A

MANUAL

Sets

the

counterto

totalize

events

(pulses

or

periods)

on

input

A

during

the

time

interval

between

releasing

and

depressing

the

DISPL

HOLD

push-button.

An

event

is

defined

as

a

positive-going

slope.

The

result

can

be

accumulated

with

another

count

sequence

or

reset

with

the

RESET

button.

COUNT

A

_|

1_

Gated

by

B

The

counter

will

totalize

events

on

input

A,

between

the

leading

and

trailing

edge

of

the

input

B

signal.

COUNT

A

n

n

Start

and

Stop

by

B

The

counter

will

totalize

events

on

input

A,

between

the

start

and

stop

event

on

input

B.

PULSE

WIDTH

A

Sets

the

counter

to

measure

the

pulse-width

of

the

signal

connected

to

input

A.

TIME

INT

SINGLE

A-B

Sets

the

counterto

measure

the

time

interval

between

pulses

on

input

A

and

B.

11

o

ARMirUC

FREQ

AVERAGE

EXT

RESET

INCL

OPTION

THERM

FUSED

MAINS

TRANSF

GATE

MONITOR

©

©

EXT

BATT

11.8-

28

©

©

o-

©

TIME

INT

AVERAGE

A-B

Sets

the

counter

to

measure

the

time

interval

average

of

a

repetitive

signal

that

is

not

synchronized

with

the

used

standard

frequency.

PERIOD

A

Sets

the

counter

to

measure

the

average

period

time

of

the

signal

connected

to

input

A.

Input

amplifier

ATTxIO

When

depressed,

the

sensitivity

is

attenuated

by

a

factor

10

for

input

A

or

B.

In

DC

mode

the

equivalent

trigger

level

is

multiplied

by

10.

SLOPE

©_

When

depressed,

the

triggering

occurs

on

the

trailing

edge

instead

of

the

normal

leading

edge.

50kHz

FILTER

A

low-pass

filter

to

improve

triggering

of

noisy

signals

with

frequencies

below

50kHz.

Applies

to

input

A

only.

COM

via

A

Connects

channel

A

and

8

internally.

In

this

mode

input

B

is

disconnected.

TRIGGER

LEVEL

When

the

rotary

knob

is

depressed,

the

DC

mode

is

selected

and

the

trigger

level

is

adjustable

between

-

2.5Vand

-f-2.5V.

Tri-state

trigger

indicators

on

PM6671

...72

light

to

indicate

trigger

status:

On

=

trigger

level

is

too

low

Blinking

=

triggering

occurs,

i.e.

input

signal

crosses

hysteresis

band

Off

=

trigger

level

is

too

high

The

trigger

level

output

on

the

front

panel

of

PM6671...72

makes

it

possible

to

measure

the

set

trigger

level.

When

ATTxlO

is

depressed,

the

trigger

level

is

adjustable

between

-

25\/

and

-I-

25V,

but

the

output

level

is

still

-2.5V...-I-2.5V.

SENSITIVITY

When

the

rotary

knob

is

pulled,

the

AC

mode

is

selected

and

the

sensitivity

is

adjustable

between

approx

10...100mVR|\/]s

IGHz,

PM

6672

only

When

depressed,

input

C

is

connected.

The

sensitivity

is

adjusted

automatically.

LED

indicators

REMOTE

Indicates

that

the

counter

is

in

the

remote-controlled

mode

via

the

optional

Bus

Interface

PM9696.

GATE

Indicates

that

a

measurement

is

in

progress.

UNIT

INDICATOR

A

multi-purpose

4-LED

unit

indicator.

For

FREQ.

read:

Hz,

kHz,

MHz,

GHz.

For

PERIOD,

TIME

and

PULSE

WIDTH

read:

ns,

ps,

ms,

s.

For

COUNT

read:

ps/kHz

=

10®

pulses

ms/MHz

=

10®

pulses

s/GHz

=

10®

pulses

REAR

PANEL

EXT

STD

IN/INT

STD

OUT

Input

D

Two-position

switch

selection

of

using

BNC

connector

D

either

as

an

output

for

the

internal

10MHz

standard

signal

or

as

an

input

for

an

external

standard

signal.

ARMING/FREQ

AVERAGE/EXT

RESET

Input

E

Three

position

slide

switch

for

selecting

the

functions

of

input

E.

GATE

MONITOR

Enables

observation

of

the

measured

time

interval

and

the

trigger

hold-off

time

on

an

oscilloscope.

EXT

BATT

Input

from

an

external

DC

source

11.8...28V.

12

Theory

of

Measurements

Introduction

The

microcomputer-based

PM

6670...72

provide

a

wide

range

of

frequency

and

time

measuring

func-

tinons,

including

period

average,

time

interval

average

as

well

as

three

count

modes.

Resolution

down

to

lOps

is

possible

with

time

interval

average.

In

ad

dition,

these

timer/counters

offer

pulse

width

measurements,

phase

delay

directly

in

degrees

and

tachometer

readings

i

RPM.

PM

6670...72

feature

automatic

truncation

of

digits

and

automatic

calculation

of

displayed

LSD

(

Least

Significant

Digit).

Only

significant

digits

are

displayed

and

no

overflow

can

occur,

except

for

RPM

measure

ments.

A

block

diagram

is

shown

in

Fig.

3.1.

To

identical

channels

are

used

for

accurate

time

interval

measure

ments.

£XT

R£F

FRtQ

^

COUNT

RCC.

{INPUT

CYCLES)

IEEE

-psaaus

BCD

OUTPUT

ANALOG

OUTPUT

Fig.

3.1.

Block

diagram

Input

triggering

functions

As

the

input

signal

can

have

very

different

wave

forms,

it

is

necessary

to

pulse

shape

the

signal.

Ohterwise,

the

counting

circuits

could

not

handle

the

signal.

The

input

circuits

consist

of:

•

AC/DC-coupling

selector;

•

an

input

step

attenuator

(xlO),

to

attenuate

exces

sive

input

signals

to

fit

the±

2.5V

trigger

level

off-set

range;

•

a

switchable

low-pass

filter

for

noise

rejection;

•

a

differential

amplifier

that

allows

trigger

level

setting;

•

trigger

circuits

with

variable

hysteresis

band;

The

functional

difference

between

AC-

and

DC-

coupled

input

is

illustrated

in

Fig.

3.2.

Input

A,

AC

-

coupled

Input

A,

DC'COupled

TCT!

A

^NSITIVITV

(

HYS

TERLS

/

5)

(XlO)

Fig.

3.2.

Block

diagram

of

the

input

circuits.

In

AC-coupled

mode,

which

is

the

normal

case

for

frequency

measurements,

the

trigger

level/sensi

tivity

potentiometer

controls

the

Schmitt-trigger

sensitivity.

In

combination

with

the

xlO

attenuator,

this

enables

a

variable

trigger

hysteresis

band,

thus

a

variable

input

sensitivity

(variable

noise

immunity).

This

is

essential

for

correct

triggering

for

frequency

measurements

of

noisy

signals.

In

DC-coupled

mode,

which

is

the

normal

mode

for

time

measurements,

the

trigger

level/sensitivity

potentiometer

controls

the

differential

amplifier.

This

results

in

a

continuous

variable

trigger

level

setting.

The

Schmitt-trigger

sensitivity

is

not

influenced,

but

is

set

to

minimum.

It

is

of

utmost

importance

to

have

as

narrow

hysteresis

band

as

possible

for

time

measurements.