Gr 1214-a User manual

OPERATING

INSTRUCTIONS

otA

K'

i

TYPES

1214

-A,

-D,

a

nd

UNIT

OSCILLATORS

m

■

GR.

DtHitr

i

inisItIrIuImIeiniti

GEN

E

RAL

RAD

I

O

COMPANY

WEST

CONCORD,

AAASSACHUSETTS,

USA

H

Figure

1.

(Above,

left

to

right)

Types

1214-A,

1214-D,

and

1214-M

Unit

Oscillators.

SPECIFICATIONS

1214-A

1214-D

1214-M

FREQUENCY

400

or

1000

cps

120

cps

1

Mc

ACCURACY

+1

See

Note

A

±1%

MAX

OUTPUT

200

mw

into

8000R

400

mw

into

1,10,100,1000

52

(1611-B

Bridge)

300

mw

into

50(2

OPEN-CIRCUIT

OUTPUT

VOLTAGE

0-60V

45,13,4.5orl.3

0-7v

DISTORTION

355

into

sooon

355

into

matched

load

3.5%

into

50(2

POWER

INPUT

115

V,

40-60

cps

115

V,

40-60

cps

115

V,

40-60

cps

POWER

CONSUMPTION

16

w

16

w

12

w

DIMENSIONS

Width

Hei^t

Depth

4-3/4

inches

(120

mm).

5-1/4

inches

(135

mm).

6

inches

(155

mm).

4-3/4

inches

(120

mm).

5-1/4

inches

(135

mm),

6

inches

(155

mm).

4-3/4

In.

(120

mm).

5-1/4

in.

(135

mm).

6

in.

(155

mm).

NET

WEIGHT

4-1/2

lb

(2.1

kg)

4-1/2

lb

(2.1

kg)

2-3/4

lb

(1.3

kg)

Note

A:

±5%

when

used

with

Type

1611-B

Bridge.

Open-circuit

frequency

is

122

cps

±2%.

Form

1214-0100-H

January,

1965

TYPES

1214.A,

-D,

AND

-M

UNIT

OSCILLATORS

1

PURPOSE.

The

Type

1214

Unit

Oscillators

(Figure

1)

are

compact,

low-distortion

signal

sources

intended

primarily

for

use

with

compan

ion

General

Radio

instruments,

but

useful

also

as

general-purpose

labo

ratory

oscillators.

These

Unit

Oscillators

cover

the

following

fre

quencies:

Type

Frequency

1214-A

1214-D

1214-M

400,

1000

cps

120

cps

1

Mc

2

DESCRIPTION.

2.1

CIRCUIT.

The

Type

1214

Unit

Oscillator

includes

a

built-in

trans

formerless

power

supply,

which

operates

from

115

volts,

40

to

60

cps.

(Direct

current

may

be

used,

but

performance

may

not

be

within

speci

fications.)

The

oscillator

is

a

Hartley

circuit,

with

the

coil

tapped

for

1000-cps

operation

in

the

-A

model.

The

output

circuit

is

cou

pled

through

an

isolating

pickup

coil,

andean

be

operated

either

grounded

or

ungrounded.

2.2

CONTROLS.

Power

is

applied

by

means

of

an

OFF-ON

toggle

switch

on

the

panel.

Other

panel

controls

include

a

frequency

selector

toggle

switch

on

the

-A

model,

plus

the

following:

Name

Model

Type

Function

Output

Control

A,

M

Continuous

rotary

control

Varies

output

power

from

zero

to

maxi

mum.

SET

TO

BRIDGE

MULTIPLIER

4-pos

selector

switch

Matches

output

to

various

bridge

loads.

Af

M

Continuous

rotary

control

Varies

frequency

±1%

from

1

Mc.

GENERAL

RADIO

COMPANY

2.3

CONNECTORS.

The

output

terminals

of

the

Type

1214

Unit

Oscil

lator

are

jack-top

binding

posts

with

3/4-inch

spacing.

A

link

and

sep

arate

ground

binding

post

below

the

output

pair

permit

grounded

or

un

grounded

operation

of

the

oscillator.

On

the

Type

1214-D,

the

EXT

OSC

panel

jack

permits

use

of

the

Type

1214-D's

matching

transformer

with

an

external

audio

oscillator.

3

OPERATING

PROCEDURE.

3.1

TYPE

1214-A.

Connect

the

device

to

be

driven

to

the

output

binding

posts.

Connect

the

link

between

the

lower

two

binding

posts

if

grounded

output

is

desired.

Connect

the

Unit

Oscillator

to

a

115-volt,40-60-cps

source,

set

the

OUTPUT

FREQUENCY

switch

to

the

desired

frequency,

and

snap

the

power

switch

ON.

The

panel

lamp

should

light

to

indicate

application

of

power.

By

means

of

the

output

control

in

the

center

of

the

panel,

output

power

may

be

varied

from

zero

to

a

maximum

of

200

mw

into

an

8000-

ohm

load.

3.2

TYPE

1214-D.

When

the

Type

1214-D

Unit

Oscillator

is

used

with

the

Type

1611-B

Capacitance

Test

Bridge,

the

Unit

Oscillator

output

ter

minals

should

be

connected

to

the

EXT

GEN

terminals

of

the

bridge.

Connect

the

third

binding

post

of

the

oscillator

to

an

external

ground,

preferably

at

the

same

point

at

which

the

bridge

is

grounded.

For

grounded

output,

connect

the

link

between

the

lower

two

binding

posts.

Set

the

SET

TOBREXJE

MULTIPLIER

switch

to

the

position

correspond

ing

to

the

setting

of

the

bridge

MULTIPLY

CAPACITANCE

BY

switch.

Connect

the

Unit

Oscillator

toa

115-volt,40-60-cps

source,

and

snap

the

power

switch

ON.

The

panel

lamp

should

light

to

indicate

application

of

power.

If

an

external

audio

oscillatoris

to

be

usedwiththe

matching

trans

former

of

the

Type

1214-D,

connect

the

external

oscillator

to

the

EXT

OSC

jack,

and

connect

the

Type

1214-D

OUTPUT

to

the

bridge

EXT

GEN

con

nector.

Set

the

bridge

filter

switch

to

EXT

and

connect

an

external

filter

to

the

bridge

EXT

FILTER

jack.

Under

normal

operation,

the

output

voltages

delivered

to

the

Type

1611-B

bridge

are

as

follows:

Multiplier

Capacitance

Volts

Multiplier

Capacitance

Volts

X

1

37

X

100

4.8

10

31

1000

4.8

X

10

16

X

1000

1.6

100

15

10,000

1.6

TYPES

1214.A,

-D,

AND

-M

UNIT

OSCILLATORS

3.3

TYPE

1214-M.

Connect

the

device

to

be

driven

to

the

output

of

the

Type

1214-M,

using

either

the

side

multipoint

connector

(see

Figure

12

for

proper

coimections)

or

the

panel

jack-top

bindingposts.

For

grounded

output,

connect

the

link

between

the

lower

two

binding

posts.

Connect

the

Unit

Oscillator

to

a

115-volt,

40-60-cps

source,

and

snap

the

power

switch

ON.

The

panel

lamp

should

light

to

indicate

application

of

power.

By

means

of

the

output

control

in

the

center

of

the

panel,

output

power

can

be

varied

from

zero

to

300

milliwatts

into

a

50-ohm

load.

To

compensate

for

frequency

shift

with

changing

load

conditions,

or

to

match

the

output

frequency

to

the

frequency

of

an

external

filter

or

other

tuned

device,

theAf

control

will

vary

the

output

frequency

±1%

from

1

Mc.

4

SERVICE

AND

MAINTENANCE.

4.1

GENERAL.

The

two-year

warranty

given

with

every

General

Radio

instrument

attests

the

quality

of

materials

and

workmanship

in

our

products.

When

difficulties

do

occur,

our

service

engineers

will

assist

in

any

way

possible.

Incase

of

difficulties

that

cannot

be

eliminated

by

the

use

of

these

service

instructions,

please

write

or

phone

our

Service

Department,

giving

full

information

of

the

trouble

and

of

steps

taken

to

remedy

it.

Be

sure

to

mention

the

serial

and

type

numbers

of

the

instrument.

Before

returning

an

instrument

to

General

Radio

for

service,

please

write

to

our

Service

Department

or

nearest

district

office

(see

back

cover),

requesting

a

Returned

Material

Tag.

Use

of

this

tag

will

insure

proper

handling

and

identification.

For

instruments

not

covered

by

the

warranty,

a

purchase

order

should

be

forwarded

to

avoid

unnecessary

delay.

4.2

REMOVAL

OF

COVER.

To

remove

the

cover,

loosen

the

thumb

screw

on

the

right-hand

side

of

the

instrument

and

slide

the

cover

off,

away

from

the

panel.

With

the

cover

off,

tubes

and

fuses

are

accessible.

4.3

TEST

VOLTAGES

AND

RESISTANCES.

The

following

test

voltages

and

resist£mces

are

given

to

aid

in

trouble-shooting.

Due

to

the

direct

connection

to

the

power

line,

the

oscillator

and

power-supply

circuits

are

not

grounded

to

the

chassis.

Voltage

measurements

are

therefore

referred

to

2

of

the

Type

117N7GT

tube.

DC

voltages

were

meas

ured

with

a

20,000-ohm/volt

meter.

Resistance

measurements

were

made

with

8

connected

to

2,

and

with

power

off.

GENERAL

RADIO

COMPANY

TABLE

OF

VOLTAGES

VI,

VOLTS

TO

2

1214-A

1214-D

1214-M

1

00

0

2

000

3

112

94

112

4

-10

-45

-43

5

92

96

112

6

0

00

7

115

ac

115

ac

115

ac

8

123

109

116

TABLE

OF

RESISTANCES

VI,

RESISTANCE

TO

GROUND

(in

ohms)

1214-A

1214-D

1214-M

1

00

00 00

2

000

3

330

350

300

4

1

M

1

M

300

k

5

4.7

k

295

300

6

00

0

7

180

8

0

NOTE:

For

conditions

of

measurement,

refer

to

paragraph

4.3.

PARTS

LIST

Ref

No

Model

CAPACITORS

Part

No

C1

D

Oil,

0.5

|jF

±10%

600

V

4510-4800

CIA

A

0.27

or

0.33

pF

±5%

400

V

*

CIA

D

Oil,

0.068

pF

±10%

400

V

1214-0406

ClA^

30

pF\

CIB

>

M

Electrolytic,

30

pF

^300

V

4450-3400

CIC

j

90

pF,j

CIB

A,

D

*

400

V

♦

C2

A

Mica,

0.01

pF

±10%

300

V

4760-0100

C2

D

Wax,

0.047

pF

±10%

400

V

5020-1000

C2

M

Mica,

35

pF

±10%

500

V

4660-1600

C3

M

Mica,

130

pF

±10%

500

V

4660-3200

C3A

1

30

pF

C3B

>

D

Electrolytic,

30

pF

300

V

4450-3400

C3C

1

90

pF

C3

30

pF

C4

A

Electrolytic,

30

pF

300

V

4450-3400

C5

90

pF

C4

M

Air,

4-50

pF

4380-0300

C5

M

Air,

2.8-16

pF

4380-3400

C6

M

Ceramic,

0.001

pF

1000

V

4404-2109

C7

M

Ceramic,

0.001

pF

1000

V

4404-2109

C8

M

Ceramic,

0.001

pF

1000

V

4404-2109

C9

M

Ceramic,

0.001

pF

1000

V

4404-2109

RESISTORS

R1

A,

D

Thyrite

6740-0300

R1

M

POTENTIOMETER,

250

n

±10%

6020-0100

R2

A

Composition,

1

M£2

±5%

6100-5105

R2

D

Composition,

510

kfl

±5%

1/2

W

6100-4515

R2

M

Composition,

300

kU

±5%

1/2

W

6100-4305

R3

M

Composition,

75

±10%

1/2

W

6110-0755

R4

A

Composition,

4.3

kfi

±5%

1/2

W

6100-2435

R4

M

Composition,

100

±5%

1/2

W

6100-1105

Ref

No

Model

RESISTORS

Part

No

R5

A,

D

Composition,

1

MU

±10%

1/2

W

6100-5105

R5

M

Composition,

100

kfl

±10%

1/2W

part

of

7510-1940

R6

A

POTENTIOMETER,

10

kfi

±5%

0214-4120

R6

M

Composition,

100

n

±5%

1/1

W

6100-1105

R7

A,

D

Composition,

75

a

±5%

1/2

W

6110-3755

R8

A,

D

Composition,

100

k£l

±10%

1/2

W

part

of

7510-1940

R9

A,

D

Composition,

100

n

±5%

1/2

W

6100-1105

RIO

A,

D

Composition,

470

±10%

1/2

W

6100-1475

Rll

A,

D

Composition,

100

n

±5%

1/2

W

6100-1105

F1

F2

LI

L2

L3

L4

PI

SI

32

T1

T2

VI

A,

D

M

A,

D

M

MISCELLANEOUS

FUSE,

0.4-A,

Slo-Blo

FUSE,

0.5-A,

Slo-Blo

FUSE,

0.4-A,

Slo-Blo

FUSE,

0.5-A,

Slo-Blo

INDUCTOR

5330-0900

5330-1000

5330-0900

5330-1000

1330-2032

M

CHOKE,

Air,

M

CHOKE,

Air,

A,

D,

M

PILOT

LAMP,

A,

D,

M

SWITCH,

dpst

A

SWITCH,

dpdt

2.2

mH

wafers

Type

C1059

2.2

mH

wafers

Type

C1059

115-V

Type

NE-51

ON-OFF

OUTPUT

FREQUENCY

4290-

8390-

7910-

D

SWITCH,

rotary

wafer.

A

TRANSFORMER

D

TRANSFORMER

D

TRANSFORMER

A,

D,

M

TUBE,

Type

117N7-GT

BRIDGE

MULTIPLIER

7890-

0345-

0746-

7530-

3600

0600

1300

1780

4552

4670

4280

2700

Value

and

type

determined

by

laboratory.

GENERAL

RADIO

COMPANY

Figure

2.

Interior

View,

Type

1214-A

Unit

Oscillator.

note:ReStSTANCe^tN

OHMS

UNLESS

WH-OR^

OTHERWISE

SPECIFIED

H'lOOO

M

MEGOHM

MAX.

POWER

OUTPUT

0^0

WATT

APPROX.

WITH

8000

OHM

LOAD

CAPACITANCE

IN

MICROFARADS

UNLESS

OTHERWISE

SPEQPIED

WH-BL

OUTPUT

V'l

j

(htnT'GT)

J'JiO

R-IO

400

\

R-9

R-ll

FREQUENCY

CYCLES

WH-6N

ON

WH-BR

lOOK

WH'YE

^WH-VT

INPUT

II

5

V.

40-60C

-<

-o

m

C/)

ro

►

P

>

Z

O

k

o

</•

n

o

cn

Figure

3,

Schematic

Diagram,

Type

1214-A

Unit

Oscillator.

GENERAL

RADIO

COMPANY

Figure

4.

Top

Interior

View,

Type

1214-D

Unit

Oscillator.

Rl

RIO

Figure

5.

Bottom

Interior

View,

Type

1'214-D

Unit

Oscillator.

note:

RESISTORS

1/2

WATT

UNLESS

OTHERWISE

SPECIFIED.

RESISTANCE

VALUES

IN

OHMS

UNLESS

OTHERWISE

SPECIFIED

If'1000

OHMS

M'I

MEGOHM

CAPACITANCE

VALUES

ONE

S

OVER

IN

MICRO-MICROFARADS

LESS

THAN

ONE

IN

MICROFARADS

UNLESS

OTHERWISE

SPECIFIED.

SET

TO

BRIDGE

MULTIPLIER

XI

XIO

XlOO

XIOOO

ENGRAVING

WH-BL

SIOK

R2

CiB

C2

0.047

o.oia

OUTPUT

WH-BH

VI(II7N7-GT

FRAME

30fjf

SOfif

0.4

amp

R8

lOOK

INPUT

lISv

40-60C

PI

(NE'SU

0.4

amp

wM-er

WH-SM

SCHEMATIC

DIAGRAM

FOR

I2I4-D

120c

OSCILLATOR

■0

m

K>

>

b

►

z

o

k

c

z

o

</»

o

70

in

Figure

6.

Schematic

Diagram,

Type

1214-0

Unit

Oscillator.

GENERAL

RADIO

COMPANY

Rl

PI

Ti

;^(Dc

Figure

10.

Top

Interior

View,

Type

1214-M

Unit

Oscillator.

C3

C4

02

Figure

11.

Bottom

Interior

View,

Type

1214-M

Unit

Oscillator.

10

rCLLOW

rL'.SO!

II7N7-GT

2.8-16

g

300K

F!

INPUT

nsv.

40-60c

'

4^..

T

L3

22mh

-/00000^

C6

-.00!

1

C7

00/

-tOQQQQr-

L4

2.2mh

orP.

ON

A

/OOK

-C8

'^.00/

^C9

-.00/

MAX.

OUTPUT

ZOOMW.

/NTO

SOP

NOTE-

RES/STOPS

//2WATT

UNLESS

OTHERW/SE

SPEC/F/ED.

RESISTANCE

VALUE

/N

OHMS

UNLESS

OTHERW/SE

SPEC/F/ED.

K=

/OOO

OHMS

M-

/

MEGOHM

CAPACITANCE

VALUES

ONE

8

OVER

/N

M/CRO-

M/CROFARADS,

LESS

THAN

ONE

/N

M/CROFARADS.

OkNOB

CONTROL

^SCREWDR/VER

CONTROL

-<

-0

m

</»

>

P

>

z

o

k

o

</*

n

Figure

12.

Schematic

Diagram,

Type

1214-M

Unit

Oscillator.

O

70

</*

GENERAL

RADIO

UNIT

INSTRUMENTS

Type

201

Unit

Regulated

Power

Supply

Type

203

Unit

Power

Supply

Type

205

Adjustable

Regulated

Power

Supply

Type

206

Unit

Amplifier

Type

208

Unit

Oscillator

65

to

500

Mc

Type

209-C

Unit

Oscillator

250

to

920

Mc

Type

209-CL

Unit

Oscillator

180

to

600

Mc

Type

210

Unit

RC

Oscillator

20

cps

to

.5

Mc

Type

211

Unit

Oscillator

0.5

to

50

Mc

Type

212

Unit

Null

Detector

Type

213

Unit

Time/Frequency

Calibrator

Type

214-A

Unit

Oscillator

400

and

1000

cps

Type

214-D

Unit

Oscil

lator

120

cps

Type

214-M

Unit

Oscillator

1

Mc

Type

215

Unit

Oscillator

50

to

250

Mc

Type

216

Unit

l-F

Amplifier

Type

217

Unit

Pulser

Type

218

Unit

Oscillator

900

to

2000

Mc

Type

220

Unit

Klystron

Oscillator

Type

263-B

Amplitude

Regulating

Power

Supply

Type

264-A

Modulating

Power

Supply

Type

361-A

UHF

Oscillator

12

GENERAL

RADIO

COMPANY

WEST

CONCORD,

MASSACHUSETTS,*

01781

617

369-4400

617

646-7400

SALES

ENGINEERING

OFFICES

METROPOLITAN

NEW

YORK*

Broad

Avenue

a1

Linden

Ridgefield/

New

Jersey^

07657

Telephone

N.Y.

212

964-2722

N.J.

201

943-3140

SYRACUSE

PIckard

Bulfding

East

Moffoy

Road

Syracuse,

New

York,

13211

Te/ephone

375

454-9323

PHILADELPHIA

General

Radio

Company

Fort

Washington

Industrial

Park

Fort

Washington,

Pennsylvania

19034

Telephone

275

646-8030

WASHINGTON*

AND

BALTIMORE

Rockville

Pike

at

Wall

Lane

Rockville,

Maryland,

20852

Telephone

301

946-1600

ORLANDO

7

73

East

Colonial

Drive

Orlando,

Florida,

32801

Telephone

305

425-4671

*

Repair

services

ore

available

at

these

district

offices.

CHICAGO*

5605

West

North

Avenue

Oak

Park,

Illinois,

60302

Telephone

312

848-9400

CLEVELAND

5579

Pearl

Road

Cleveland,

Ohio,

44129

Telephone

276

886-0750

LOS

ANGELES*

7000

North

Seward

Street

Los

Angeles,

Call/ornra,

90038

Telephone

273

469-6207

SAN

FRANCISCO

1186

Los

Altos

Avenue

Los

Altos,

California,

94022

Telephone

415

948-8233

DALLAS

2501

-A

West

Mockingbird

Lane

Dallas,

Texas,

75235

Telephone

214

FLeetwood

7-4031

TORONTO*

99

Floral

Parkway

Toronto

15,

Ontario,

Canada

Telephone

416

247-2171

MONTREAL

Office

395,

1255

Laird

Boulevard

Town

of

Mount

Royal,

Quebec,

Canada

Telephone

514

737-3673

General

Radio

Company

(Overseas),

8008

Zurich,

Switzerland

General

Radio

Company

(U.K.)

Limited,

Bourne

End,

Buckinghamshire,

England

Representatives

in

Principal

Overseas

Countries

Printed

in

USA

GR 1214-A User manual

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