BRUEL & KJAER 1022 - Applications; Automatically Recording Harmonics

BRUEL & KJAER 1022

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2.

Press

pushbutton

marked

SINGLE

CHART

and

hold

in.

(Paper

will

move

and

the

reference

voltage

commences

to

record).

Release

push-

button

when

paper

has

moved

to

about

the

"200"

c/s

line.

3.

Units

are

correctly

synchronized

when

switching

from

the

80

cis

to

the

100 c/s

filter

takes

place

on

the

90

c/s

line.

4.

As

a

means

to

see

how

far

the

paper

has

to

be

shifted,

it

is

re-

commended

to

draw

a

line,

by

means

of

the

"100

mV

Ref."

button

on

the

front

plate

of

the

Recorder,

at

the

point

where

the

paper

has

stopped.

By

using

this

line

as

a

reference

the

paper

can

be

shifted

the

appro

·

priate

distance

to

give

correct

synchronization.

5.

To

check

the

synchronization,

run

the

recording

until

the

pen

is

stopped

on

for

example

the

2ooo

c/

f>

line.

When

correctly

syn-

chronized,

the

switching

of

the

800

c/s

to

the

1ooo

c/s

filter

should

now

take

place

at

the

900 c/s

line.

If

this

is

not

the

case

repe

•

at

from

item

2.

G.

Finally

reset

the

Writing

Speed

on

250

mm

or

lower

if

the

large

figures

are

being

used,

and

to a

figure

of

500

mm

or

less

if

using

the

small

figures.

To

complete

the

synchronization

sequency

the

B.F.O.

Type

10·22

must

be

synchronized

with

the

f~·equency

cal

·

ibration

on

the

paper.

1.

Rotate

main

scale

of

B.F.O.

manually

until

it

corresponds

to

the

frequency

denoted

by

the

stylus,

firstly

moving

it

to

a

higher

fre-

quency

and

then

rotating

it

back

until

it

arrives

on

the

desired

frequency.

This

will

take

up

any

possible

backlash

with

the

gears

of

the

B.F.O.

2.

Move

the

switch

AUTOMATIC

SCANNING

of

the

B.F.O.

to

the

"on"

position.

All

units

should

now

be

in

complete

synchronization

and

on

switching

the

toggle

switch

of

the

PAPER

DRIVE

on

the

Recorder

to

"start",

the

combination

will

operate

in

complete

unison.

EXAMPLES

OF

APPLICATIONS

Applications

for

the

combined

B.F.O. 1022

and

Level

Recorder

2305

have

been

described,

and

illustrated,

under

this

heading

in

the

earlier

phase

of

this

manual.

Now

one

important

use

for

the

treble

combination,

B.F.O.

+

Level

Recorder

+

Spectrometer

(i.e.

the

AF

Response

and

Spectrum

Re-

corder

Type

3332)

will

be

described,

followed

by

another

example

using

the

Spectrometer

and

Level

Recorder

with

the

exclusion

of

the

B.F.O.

1022

section

.

Automatically

Recording Harmonics.

The

Type

3332

combination

is

well-suited

for

the

automatic

recording

of

harmonic

distort

•

ion,

as

the

Spectrometer

can

be

switched

to

select

any

specific

harmonic

component

of

the

fundamental

in

use,

up

to

and

including

49