HP 400E Service manual

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MODEL

400E/EL

AC

VOLTMETER

Serials

Prefixed:

532,

536

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PRELIMINARY

OPERATING

AND

SERVICE

MANUAL

MODEL

400E/EL

AC

VOLTMETER

Serials

Prefixed:

532,

536

Copyright

Hewlett-Packard

Company

1965

P.O.

Box

301,

Loveland,

Colorado,

80537

U.S.A.

Model

Sectio

I

Sectio

II

Sectio

Til

Sectio

IV

Sectio

400E/EL

Table

of

Contents

TABLE

OF

CONTENTS

n

Page

GENERAL

INFORMATION

.......-62

2-2

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eevee

1-1

Je.

“DESETIPLION.

“ee

aos

iS.

eS

,

wo

eA

LS.

BSE

ee

wR

1-1

1-4.

Instrument

and

Manual

Identification

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

1-1

n

Page

INSTALLATION

|.)

dase

6

od.

BSS

Bre

YR

RO

ww

aes

2-1

Dat.

ANEPOOMCHON:

<<

a

&

Swi

Gee

ee

Se

ae

Se

2-1

2-3.

Initial

Inspection.

.: «6

2

6

&

heh

ee

eG

2-1

2-5.

Power

Requirements

...

2...

2.

ee

tee

eee

ee

es

2-1

2-7.

Grounding

Requirements

........-2+4

eee

2-1

2210.

Installation.

cS)

e-

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Be

a

Be

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Se

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ay

2-1

2-12

Bench

Mounting

«206

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6

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ew

ee

2-1

2-14.

Rack

Mounting:

=.

©

3)

heise

sai

bs

ew

we

SEE

Rs

2-2

2-16.

Combination

Mounting

.........+4-+

252

eee

2-2

2-18.

Repackaging

for

Shipment

.....

2...

2+

ee

eeeee

2-2

n

Page

OPERATING

INSTRUCTIONS

.......6+2-0+60022ee88

8-8

3-1

S23.

Introduction:

-3-

4G.

6

4

Bo

a

atte

ewes!

W

wee

2

3-1

3-4.

Location

of

Controls

and

Indicators

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

3-1

3-6.

Operating

Instructions

......

2.2.

eee

ee

eee

3-1

3-7.

Standard

400

B/E

DL.

-x.4.

©

s

«Sok

Gow

&

Nee

A

ae

6

3-1

3-12.

A400B

with

Option

01.

.

2.4

6.8

eee

ee

es

3-5

3-14.

400E/EL

with

Option02

..........-+.00086-

3-7

3-17.

400E/EL

with

Option03

..........6.220868-

3-7

n

Page

THEORY

OF

OPERATION

|

“ics-a°

dy

9

Gy

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use.

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4-1

AQT.

(General

io

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4-1

4-6.

Input

Attenuator

(See

Schematic,

Figure

6-1)

.....

4-1

4-8.

Impedance

Converter

...

1...

ee

eee

eevee

4-1

4-11.

Metér

Amplifier

o5-c-6:.

4

4%

BeOS

SE

ER

ee

Soars

4-2

4-14.

Meter

Bridvte:

tase

go

OS

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ee,

oe

A

4-2

4-17.

AC

Output-Citcult:

<0

s9-e

eve

68

See

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4-2

4-19.

Power

Supply:

wx.

6-

e658

Gis:

Be

ea

ae,

SE

4-2

n

Page

MAINTENANCE:

so-55-3.

4.4

2

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ed

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5-1

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Int¥Oduetion®

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he

as

5-1

5-3.

Required

Equipment

.....

2...

eee

ee

eens

5-1

5-5.

Mechanical

Zero

Adjust

(400E

Only)

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

5-1

5-7,.

Performance

Checks

«2.606

«6

6

Riek

ke

koe

Be

ae

eG

5-1

5-9.

Accuracy

and

Frequency

Response

Test

.......

5-1

5-19.

Input

Impedance

Check

...........2.2.20808.

5-8

5-24.

Alignment

and

Calibration

Procedure

...........

5-9

5-26.

Cover

Removal

sé

2-4

eG

Se

OK

A

AO

RES

5-9

ili

Table

of

Contents

TABLE

OF

CONTENTS

(Cont'd)

Section

V

MAINTENANCE

(Cont'd)

5-29.

Bias’AQist.

..

2

a8

2060s

a5:

4

ecm

eS

5-31.

AC

Output

Zero

..........-..

5-33.

CaliDFation:

2:4.°45.4

06

+5.

}

ake

Sea

wee

5-36.

Troubleshooting

............4..-.

5-40.

Power

Supply

2.4:

4.40

44%

4

ees

5-42.

Amplifiers

«<6

4.494.

ee

3

el

oud

%

5-45.

AC

Output

Circuit)

ob

eo

me

Pa

ey

Section

VI

CIRCUIT

DIAGRAMS

............e8.+e-.

6-1.

Introduction

..............0e8e8-4

Section

VII

REPLACEABLE

PARTS

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

7-1.

Imtroduction

..........6+4-+e5+80848-8

7-4.

Ordering

Information

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

7-6.

Non-Listed

Parts

.............-.

Model

400E/EL

models

OE/400EL

AC

VOLTMETERS

..

PACKARD

TECHNICAL

DATA

12

AUG

65

li

fT

‘Ap

&

EWLETT

|

goot

AC

voLTMeTet

:

ci)

peer

PACKARD

9

“INDIVIDUALLY

~TAUT

B

‘

SOLID.

STATE.

i

P.

O.

Box

301,

Loveland,

Colorado,

80537,

Tel.

(303)

667-5000

®

Europe:

54

Route

Des

Acacias,

Geneva,

Switzerland,

Cable:

“HEWPACKSA"

Tel.

(022)

42.81.50

Page

2

DESCRIPTION

The

@

400E/EL

Solid-State

AC

Voltmeters

are

ruggedly

built

solid-state

precision

instruments

for

measuring

ac

voltages

from

1

millivolt

to

300

v

rms

full

scale.

They

cover

a

frequency

range

from

10

cps

to

10

mc

and

have

constant

10

megohm

input

resistance

on

all

ranges.

Input

capacity

is

24

pf

on

the

1

mv

to

1

volt

range

and

9

pf

on

the

3

vole

to

300

volt

range.

The

instruments

are

simple

to

operate

and

give

direct

voltage

and

dbm

readings.

These

ac

voltmeters

have

exceptional

long-term

stability

because

their

calibration

is

not

dependent

on

active

com-

ponent

parameters

which

are

subject

to

aging.

The

400E/

EL

may

also

be

used

as

stable,

high-gain

ac

amplifiers

or

ac-to-de

converters.

The

400E

has

all

the

characteristics

mentioned

above

with

1%

of

reading

accuracy

on

a

4-1/2”

mirror-backed

taut-band

meter.

The

meter

scale

is

individually

calibrated

for

its

particular

movement

with

100

divisions

to

give

an

added

measure

of

readability.

The

400

EL

has

all

the

characteristics

above

with

1%

of

reading

accuracy

on

a

linear

12

db

logarithmic

scale.

This

meter

is

also

individually

calibrated

with

120

divisions

and

is

ideal

for

db

measurements.

The

specifications

in

the

chart

on

the

show

these

compact,

lightweight,

solid-state

voltmeters

will

give

premium

performance

at

an

economical

price.

CIRCUIT

DESCRIPTION

The

Model

400E/EL

AC

voltmeters

use

high-gain

am-

plifiers

having

high

stability

and

wide

bandwidth.

The

solid-state

metering

circuit

is

stabilized

by

an

overall

feed-

back

loop

to

provide

maximum

stability.

The

impedance

converter

circuit

also

uses

a

large

amount

of

overall

feed-

back.

These

features

ensure

a

high

degree

of

accuracy

in-

dependent

of

line

voltage

changes

or

other

external

effects.

AC-to-DC

CONVERTER

The

Models

400E/EL

provide

a

dc

output

(1

volt

dc

for

full

scale

meter

deflection)

proportional

to

meter

de-

flection

which

can

be

used

to

drive

a

potentiometer

or

galvanometer

recorder.

This

dc

output

is

available

at

the

rear

panel

of

the

instrument

which

is

illustrated

in

figure

1.

Figure

|:

External

Battery

Terminals,

DC

Recorder

Output

Terminals

and

AC

Amplifier

Terminals

Model

400E/EL

HIGH

GAIN

AMPLIFIER

Additionally,

the

400E

and

400EL

provide

a

stable

low

distortion,

high-gain,

wideband

ac

amplifier

with

a

50-ohm

output

impedance.

Frequency

response

is

from

10

cps

to

10

mc.

The

ac

output

is

150

mv

rms

for

full

scale

meter

deflection

on

all

ranges

except

on

the

1

mv

range

which

is

105

mv.

LOGARITHMIC

MODEL

400EL

The

@

400EL

is

designed

for

greater

resolution

in

db

measurements.

This

instrument

is

useful

for

acoustical

and

communications

applications.

It

incorporates

an

@

taut-

band

mirror-backed

logarithmic

meter

movement.

For

ut-

most

accuracy,

the

meter

scale

is

individually

calibrated,

using

the

new

@

logarithmic

meter

calibrator,

The

meter

scale

provides

maximum

readability

and

+1%

of

reading

accuracy

on

the

upper

half

of

the

scale

and

+1.5%

of

read-

ing

accuracy

on

the

lower

half

scale.

The

decibel

scale

is

more

than

4-3/8”

long,

and

voltage

scales

spread

across

the

full

length.

A

range

switch

changes

sensitivity

in

10

db

steps

which,

combined

with

the

12

db

scale,

provides

the

overlap

desirable

in

decibel

level

measurements.

EASY

TO

USE

A

front

panel

range

switch

which

changes

sensitivity

in

10

db

steps,

combined

with

the

db

calibration

of

the

me-

ter,

permits

reading

of

dbm

directly

without

calibration

or

conversion

from

—72

to

+52

dbm

(0

dbm=1

milliwatt

into

600

ohms).

In

addition,

the

10

db

range

spacing

pro-

vides

2

voltage

scales

so

that

readings

are

always

greater

than

one-third

full

scale.

Consequently,

the

highest

possi-

ble

readability

and

accuracy

are

provided.

OPTIONS

Special

db-measuring

option—The

Model

400E

reads

directly

in

volts

and

db,

with

the

voltage

scale

uppermost.

The

Model

400E

(Option

01.)

with

db

scale

uppermost

is

recommended

for

greater

resolution

in

db

measurements.

Refer

to

figure

2.

1

MW

6000

DeciBELS

gt

a

VOLTS

HEWLETT

PACKARD

Figure

2:

Meter

face

on

Model

400E

(Option

O1).

Model

400E/EL

Page

3

Relative

signal

reading

option—Available

on

special

order,

the

400E/EL

(Option

02.)

provides

a

front-panel

relative

measurement

control

allowing

a

3

db

reduction

in

sensitivity

on

each

calibration

range.

This

feature

enables

the

user

to

set

the

meter

to

a

convenient

level

(such

as

0

db)

for

relative

measurements.

The

control

is

detented

in

the

absolute

position

to

disconnect

the

relative

measuring

weciais

circuitry

and

to

ensure

calibration

accuracy.

d

tun

ena

BEWLETT

Gp

racanee

Constant

Input

Capacity

Option—Available

on

special

order,

the

400E,EL

(Option:03)

provides

constant

input

capacity

(28

pf)

on

all

ranges

and

10

megohms

input

resistance.

y

ABSOLUTE.”

Figure

3:

Option

02

(400E

and

EL)

provides

relative

or

absolute

measurements.

SPECIFICATIONS

he

Model

|

te

4008

|

mv

to

300

v

full

scale,

12

ranges

Frequency

range

10

cps

to

10

mc

Calibration

reads

rms

value

of

sine

wave;

voltage

indication

pro-

portional

to

absolute

average

value

of

applied

wave;

3

MV

to

300

V

RANGES

db

scale

—10

to

+

2

db,

10

db

between

ranges:

100

Frequency

10CPS 20CPS

40CPS

500

KC

2MC

divisions

on

0

to

|

scale.

1MC

4MC

10

MC

AT

FULL

SCALE

AT

1/3

FULL

SCALE

reads

rms

value

of

sine

wave;

voltage

indication

propor-

tional

to

absolute

average

value

of

applied

wave:

linear|'

db

scale

—10

db

to

+2

db.

10

db

between

ranges:

logarithmic

voltage

scales

0.3

to

|

and

0.8

to

3:

120

divisions

from

—

10

to

+2

db.

HP

MODEL

400E

ACCURACY

%

Of

Reading

ACCURACY

%

Of

Reading

1

MY

RANGE

Frequency

10CPS

20CPS

40CPS

100

CPS

100

KC

500

KC

2MC

6MC

200

KC

1MC

4MC

AT

FULL

SCALE

AT

1/3

FULL

SCALE

—

10

AT

1/10

FULL

SCALE

Page

4

Model

400E/EL

SPECIFICATIONS

(Cont.)

HP

MODEL

400EL

ACCURACY

%

Of

Reading

3

MV

to

300

V

RANGES

Frequency

10CPS 20CPS 40CPS

AT

FULL

SCALE

==]

AT

1/3

FULL

SCALE

+4,

[a2

500

KC

2Mc

IMC

4MC

10

MC

|

MV

RANGE

Frequency

AT

1/3

FULL

SCALE

ele

10CPS

20CPS

40CPS

ACCURACY

%

Of

Reading

500

KC

2MC

6

MC

200

KC

1MC

4MC

HP

MODELS

400E/EL

AC-to-DC

CONVERTER

OUTPUT

ACCURACY

%

Of

Reading

10CPS

20CPS

40CPS

100

CPS

3

MV-300

V

RANGES

Frequency

AT

1/3

FULL

SCALE

|

MV

RANGE

Frequency

AT

FULL

SCALE

+2

&

AT

1/3

FULL

SCALE

10CPS 20CPS

40CPS

100

CPS

“For

15°C

-

40°C

on

1

mv

-

1

volt

ranges

only

HP

MODEL

400E/EL

Input

Impedance:

10

megohms

shunted

by

24

pf

on

the

1

mv-lv

ranges

and

10

megohms

shunted

by

9

pf

on

the

3v-300v

ranges.

Amplifier

AC

Output:

150

mv

rms

for

full

scale

meter

indication;

output

impedance

50

ohms,

10

cps

to

10

mc

(105

mv

on

the

1

mv

range).

AC.DC

Converter

Output:

1

vdce

output

for

full

scale

meter

deflection.

Output

Resistance:

1000

ohms.

Response

Time:

1

second

to

within

1%

of

final

value

for

a

step

change.

AC

Power:

115

or

230

volts

+10%,

50

to

1000

cps,

approx.

5

watts.

Temperature

Range:

0

to

+55°C

(except

where

noted

on

accuracy

charts).

External

Battery

Operation:

Terminals

are

provided

on

rear

panel;

positive

and

nega-

tive

voltages

between

35v

and

55v

are

required;

current

drain

from

each

voltage

is

approx.

54

ma.

(External

switching

and

on/off

monitoring

should

be

used

for

battery

operation).

a

500

KC

2MC

100

KC

500

KC

2MC

6

MC

200

KC

Cc

Weight:

Net

6

Ibs.

(2,7

kg),

Shipping

9

Ibs.

(4

kg).

Dimensions:

6-1/2”

high,

5-1/8”

wide,

11”

deep

(165,1

x

130,2

x

279,4

mm).

Price:

400E

$285.00

A00EL

$295.00

Option:

01

(400E

only)

reads

directly

in

wolts

and

db

with

db

scale

uppermost.

Add

$10.00

Option:

02

(400E

or

400EL)

front

panel

relative

control.

Add

$10.00.

Option:

03

(400E

or

400EL)

Constant

Input

ca-

pacity

(10

megohms

shunted

by

28

pf)

add

§25.00

Option:

04

(400E

only)

includes

all

three

options;

01,

02,

and

03.

Add

$45.00.

Note:

When

ordering

2

options

or

less

pleae

desig-

nate

each

option.

Prices

f.0.b.

factory

Data

subject

to

change

without

notice

&

Indicates

change

from

prior

specifications

12

\.UG

65

Model

400E/EL

.

Section

I

Paragraphs

1-1

to

1-6

SECTION

I

GENERAL

INFORMATION

1-1.

DESCRIPTION.

1-2.

The

-hp-

Models

400E

and

400EL

are

versatile

ac

voltmeters

and

db

meters.

Both

models

can

be

used

as

ac

to

de

converters

or

wideband

ampli-

fiers.

The

Model

400E

is

primarily

intended

for

voltage

measurements,

whereas

the

Model

400EL

is

primarily

a

db

meter.

However,

both

meters

indicate

both

volts

anddb.

The

400E

has

a

linear

ac

scale

with

a

logarithmic

db

scale

underneath,

and

the

400EL

has

a

linear

db

scale

with

a

logarithmic

ac

scale

underneath.

Since

the

difference

in

scales

is

the

only

difference

between

the

two

instruments,

this

manual

will

use

the

term

400E/EL

in

ref-

erence

to

both

instruments.

1-3.

The

enclosed

data

sheet

contains

a

complete

description

of

the

400E/EL

along

with

a

list

of

specifications.

1-4,

INSTRUMENT

AND

MANUAL

IDENTIFICATION.

1-5.

Hewlett-Packard

instruments

are

identified

by

a

two-section,

eight-

digit

serial

number

(000-00000).

If

the

first

three

digits

of

the

serial

num-

ber

on

your

instrument

do

not

agree

with

those

on

the

title

page

of

this

manual,

change

sheets

supplied

with

the

manual

will

define

differences

be-

tween

your

instrument

and

Model

400E/EL

described

in

this

manual.

1-6.

If

the

first

three

digits

of

the

two-section,

eight-digit

serial

number

are

prefixed

with

an

E

or

G,

your

instrument

was

produced

in

Europe.

An

E000-00000

serial

number

indicates

that

the

instrument

was

manufactured

in

England;

a

G000-00000

serial

number

indicates

that

the

instrument

was

manufactured

in

Germany.

1-1

HP 400E Service manual

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