Valhalla Scientific 2734A Service manual

2734A

DIRECT

VOLTAGE

REFERENCE

OPERATION

MAINTENACE

BANK

AND

MANUAL

tlE

VALHALLA

SCIENTIFIC

9955

San
Phone

Telex

Diego,Ca

Mesa

(6

181 75O

Rim

19)457

Rd.

92121

-SSZ6

REVTSED

1

/ 87

CERTIFICATION

valhalla

scientif

thoroughly

published

valhalla

measurements

the

to

The

invoice
appropriate

instrument

valhalla Scientif

to

specif

scientif

extent

warranty

and

during

is expressed

damages.

obtained

be

returns.

permission.

Permission

No

ic,

tested

and

ications

ic, Inc.

traceable

are

allowed

by

period

packing

warranty

the

ic, Inc.

implied.

or

directly

liability

Inc. certif

inspected

when

further

NBS's

WARRANTY

for this

list.

dates.

warranty

and

from

ies that

was shipped

it

certifies

to the

Please

f reight

we

National

calibration

instrument

will

We

period

are

a return

factory

the

refer to

prepaid. No other

will be accepted

this

and

found

f

that

Bureau

facility.

is stated

these

repair

provided it is

liable

not

authorization

for

returned

if

instrument

meet

to

rom the

factory.

it's calibration

of Standards

on

determine

to

replace

or

returned

warranty

consequential

for

number

warranty

without

lYas

it's

your

the

must

repair

such

TABLE

OF CONTENTS

SECTION
SECTION
SECTION
SECTION
SECTION
SECTION
SECTION
SECTION
SECTION
SECTION
SECTION
SECTION

SECTION

NUMBER

I

UNPACKING AND INSTALLATION

-

II

SPECIFICATIONS

-

III

AVAILABLE

-

IV

FRONT PANEL

-

V

REAR PANEL

-

VI

MANUAL

-

VII

REMOTE

-

VII

CALIBRATION

-

IX

MAINTENANCE

-

X

THEORY

-

XI

PERFORMANCE

-

XII

USEFUL HINTS

-

OPTIONS

CONTROLS AND

CONTROLS AND

OPERATION
OPERATION

AND TROUBLESHOOTING

OF OPERATION

VERIFICATION

CONNECTIONS

CONNECTORS

PAGE

t-l

2-1

1l

:1 I

t- |

5- l

o-l

l-l

8- r

9-l

r0-

Il-l

t:-

r

I

SECTION
SECTION
SECTION

XIII

XIV
XV

MANUAL

-

SCHEMATIC AND ASSEMBLY

-

PARTS LISTS

-

CHANGE

INFORMATION

DIAGRAMS

l3- r

t4- I

r5-

l

l-l

1.1

Unpacking

If

the

shipping

2734A

carriers'

is

Scientific
internal

verify

to

Section II,

Retain

the

TO VALHALLA

AUTHORIZATION

1.2

Initial

Adjustments

carton

unpacked.

or

Service

who

should authorize

in

transit that may

agent

damage

performance.

then

notify

shipping

SCIENTIFIC

SECTION I

is damaged,

If the 2734A

Center. Even

If

the 2734A

the carriers'

carton

TO DO

for

the carriers

OR ANY

SO.

.

UNPACKING

request

appears

repairs

if

not

agent

that

damaged when

the 2734A

be evident

fails

to

and

inspection.

OF

AND INSTALLATION

the carriers'

unpacked,

before

ITS

the 2734A

appears

until

meet

the

Valhalla

SERVICE

undamaged,

the 2734A

performance

Scientific

DO

NOT

be

present

then

agent

is returned

it

is

operated

specifications

or Service

RETURN

CENTERS

when

notify

to Valhalla

may

have

Center.

EQUIPMENT

PRIOR

the

the

suffered

or testecl

in

TO

OBTAINING

The

only adjustments

of the local

fitted.

105

210

The

panel,

Either

THE

2734A IS

RECON{NIENDED

UNPACKING

ENSURE

27

31A.

1.3

Instructions

The

manner
source,
connector

The

to l28VAC

to 256VAC

user

should note

and

20mm.

SHIPPED IN

IN

THAT

2134A

are not required.

the user

(see

prior

voltage

and fuses

I Amp

0.5 Amp

power

supply

50/60H2
50/60H2

required

source

voltages

that both fuses

are automatically

1.25" fuse

or

selected

sizes may

''TRANSIT

THAT

ORDER TO MAINTAIN

THE

for Bench

is delivered for

THE

UNIT HAVE

CORRECT SELECTION

Use

operation in

However,

should

the Safety Precautions

verify

that

to

operation

and

verify

to

are listed

Slo Blo Fuse

Slo Blo Fuse

are contained within

when

the

be used.

MODE'"

POWER

THE

TRACEABILITY

IS

bench

before connecting

power

the

of the 2734A

that the

below:

power

POWERED

APPLIED

MADE

use and

cord is

in 1.5).

are

the correct

correct fuse

power

the

voltage

line

BY

AS

PRIOR

special instructions

2134A

the

equipped

selection is

INTERNAL

SOON AS

OF THE

TO APPLYING

to the AC

with

a three-terminal

selection

for

socket

voitaee

this

on the rear

macle.

BATTERIES.

POSSIBLE

SPECIFICATION.

POWER

for

use in

power

is

IT

AFTIII

TO-|IIE

this

IS

1.'1 Instructions

Optional

an,rinment ranlq.

2134A

the

(by

the use

thEN it MUST

MOVEMENT.

for

Rack Mounting

rack

mounting

These

dictate that

"trays"

of

BE

brackets are

listed

are

the unit should

"slides"). If it

or

SUPPORTED SO AS

available for mounting

in

Section III

of this manual. The

be supported

is

to be transported

PREVENT

TO

l-t

2734A

the

rrrqrruqr, r tru

on both

sides along it's

while

UPWARDS AND

in

size and

JIz!

mounted

a standard l9'

weieht

enrire length

in

a

DOWNWARDS

of

rack

The

user should

temperatures.

2734A.

below the

This may

2734A in

note

that the specifications

of the

It is recommended that sufficient

achieved by

be

rack.

the

placing

least l.75" high blank

at

2734A

room be allowed

become

degraded at

for

airflow around

panels

above and

high

the

If

the unit

it is not

and

"reflector"
Under

allowed

1.5

Safety

power

The
the area in

contact connector

provided
throughout this cable to

FAILURE

THE

TO PRO\/IDE A

UNIT UNSAFE

is

plate

no circumstances should the ambient air temperature

to exceed 50C

Precautions

connector

which

through

placed

possible

beneath the

to alter

between this unit and the

while

should be a three-contact device

2734A is

the

where

an extension

FOR

the

the

CONTINUOUS

USE.

2734A has an

its location,

in

operation or

to be used,

third

cable

2734A.

exceptionally

user is recommended

the

2'734A.

while

70C

and

should

contact

provides ground

then the

GROUND CONNECTION

ground

connection

hot

exterior

to fit

surrounding the

in

not

meeting the safety

only be

operation.

mated

with

connection.

must

If

be continuous

TO THE 2734A I\{AY RENDER

top

surface,

an aluminum

2718A be

requirements

a three-

power

is

of

t-2

2.1

2.2

General

The

specifications

paragraphs.

Stability

of the

SECTION II

2734A

Direct

.

SPECIFICATIONS

Voltage

Reference

Bank

are

listed

in

the

followine

The

and

Each2734A

USA, the initial
error against

specifications
48 hours

following

of each

2.3

Settability

Each

in

the table

stability figures

assume continuous

OUTPUT

l.0V

l.0l

8V I

Y7

lOV

is shipped

the US national volt

above

(144

hours if

2 hours

output

of

the

2734A

below :

given

below are

application

30 days

l.Oppm

.Oppm 2.0ppm

0.4ppm

0.5ppm l.3ppm

(in

"hot"

adjustments made

as a traceable

shipped in

stabilization.

quoted

on

outputs

a certificate

may

transit mode)

of

option TC34)

Each 2734A

be adjusted

OUTPUT ADJUSTMENT

valid

for

power.

of

90 days

2.0ppm

0.8ppm

by Valhalla

l.5ppm.

uncertainty

with

0.lppm resolution.

RANGE

ambient

temperatures

180

3.0ppm

3.0ppm
l.6ppm

2.5ppm

from

Valhalla

Scientific

This figure

acheives

if the 2734A

of leaving

is

shipped

over the range

with

RESOLUTION

days

Scientific

may

be used

has

AC

Valhalla

the

with

and

between

in

worst

a

with

power

Scientific

actual measured values

the

l8

and 28C

year

I

5.0ppm

5.0ppm

3.0ppm

4.0ppm

San Diego,

case

traceable

the

applied

Inc

and

resolution

CA,

within

shorvn

2.4

Temperature

The

40C
conditions.

l.OV
l.0l8v

Y7
Y7

refs) 70ppm

@

ref)

Q

lOV

Coefficients

temperature
temperature

OUTPUT

l

OV

I

.018V 0.Ippm/C

Y7

lOV

l0ppm

lOppm

280ppm

5ppm total

coefficients listed

ranges

following

COEFFICIENT

0.Ippm/C

0.02ppm/C

0.05ppm/C

total
total
total

total

l5 minutes

below

0.02ppm

0.02ppm

0.l4ppm

0.56ppm

0.0lppm

are applicable

of stabilization at

z-l

within

the

the

0 to

new

18C

and

ambient

28

to

Temperature Shock

2.5

Ambient temperature

accumulative

The

output

below

Drive

:

2.6

Output

OUTPUT

l.OV

l.0l8v

Y7

lOV

(or

Any

external application

up to

2.7

Supply

The maximum change

minimum

second delay.

source

all) of

l00mA

Regulation

is less

greater

changes

change

and

resistance of

in

Resistance

output

of

voltage

each output at the

MAX DRIVE

3mA

l2mA 0.005 ohm

may

the outputs

of transients

current

of

to the

maximum

The maximum change in output

than

without

in

output

0.05ppm

be shorted

up to

permenant

voltage

value/frequency specified

following

than

greater

no

of

respective

RESISTANCE

857.14

869.95

0.05 ohm

indefinately,

1200V

damage.

caused by a

l0

a

second

per

l0C

ohm
ohm

maximum

maximum

peak,

voltage

delay.

minute may cause

than 0.0lppm/C

terminal

+/-

0.0050/o

+/-

0.0050/o

are

may continuously

and

change in supply

is less

caused by a change

is as listed

protected

0.05ppm

than

non-

a

change.

in

the table

against the

source or sink

voltage

following a l0

in supply

from the

2.8

If

a complete

less than

Output

Noise

loss

0.lppm

OUTPUT 0.01

l.0V 0.luV
l.0l8v

Y7 luV

lOV

I Add 2uV RMS maximum

power

of

may occur

0.luV

luV

occurs

following

then a non-accumulative change

stabilzation

after

to l0Hz BANDWIDTH

peak

maximum 3uV

peak

maximum 3uV

peak

maximum

peak

maximum l0uV

if

operating

from

AC

power

in output

re-application

l0Hz

20KHz

to

RMS maximum
RMS maximum

l0uV RMS maximum

source

voltage

power.

of

BANDWIDTHI

RMS maximum

of

,ta

2.9 Miscellaneous
Settling

Internal Batteries

time to

Transit

Fully

Change

TYPe

Charging time

Replacement

Normal mode life

to normal mode

drained

in

Transit mode

External

AC Line

DC

Supply :
Voltage range
Current drain

Protection

Supply :

Voltage/Frequency
Power requirements

within

batteries to

suplly

:

Interval

life

0.lppm of

operational

source

final value

Sealed

l2

hours

years

5

At

OC

:

Lead-Acid

typical

recommended

At 20C
At 40C
At

0c

At 2OC
At 40C

+24

to +40VDC

0.2A typical

Internally

protected

fuse

105

to l30V

60VA maximum while

normal

operation.

:
:
:

(36

l5 hours

24 hours
40
30
48 hours

100

at 20C

protected

(l

Amp)

or 210

<

l0 minutes

<lhour

<

l0

seconds

hours maximum)

minimum

minimum

hours
hours

(0.8A

against reverse

to

minimum
minimum
minimum

hours minimum

maximum)

against

260VAC

charging, 20VA

over

at

connection

voltage.

45

440kIz.

to

maxinrunr

ancl

irr

Safety : Designed

Maximum voltages

2.10 Physical

Size :

Weight

: l6Kg

to comply

:

Guard terminal
Guard to

89mm H x432mmW

(35

t9Ke

Q2

29Ke

(64

with

Chassis Ground

Lbs) Net
Lbs)

Shipping

Lbs)

Shipping

IEC-348

and IJL|244

to Common

terminal

x432mm D(3.5"

(without

(with

TC34)

TC34)

z-)

: 50V

: l00V

x 17" x 17")

peak

peak

maximum

maximum

2.1 1 Environmental

Temperature

Range

: Operating : 0 to

Storage :

Humidity

Altitude

: 0 to 95o/o

0 to

-1000

700/o

to

RH

at temperatures

RH

at temperatures

10.000 ft.

Vibration Per MIL-T-28800C, Type III,

2.12 Recommended
The

calibration interval for

maintain.

days between calibrations

The

Calibration

user should

Interval

the 2734A is

consult the accuracy tables

to obtain the required

40C

+

to

-20

dependent on the accuracy the user

60C

below 35C

between 35

Class 5, Style

in 2.2

accuracy.

40C

and

E

to determine

the

wishes

number

to

of

L-.+

3.1 General

This

utility

3.2

Option

section

of

the

BBL

describes

2734A.

SECTION

several

III

AVAILABLE

-

options available

from

OPTIONS

Valhalla

Scientific

to increase

the

Option BBL

with

recommended

3.3

Option RSK-3

Option RSK-3

of a 2734A

recommended

3.,1

Option RX-3

Option

rack.

3.5

Option

Option

gold plated

acuuracies

3.6

Option

This

years

is

dual

banana

whenever

in

an equipment

that

RX-3

SL-48

SL-48 is a 48

SP-2

option

of

provides

copper

greater

of

provides

operation.

a dual

is

plugs

heavy

a

shielded

of the highest

option RSK-3

all

inch

spade

than

a selection

cable

accuracies

duty rack

rack.

parts

required

long

shielded

lugs.

0.5uV

The

are desired.

of the most likely

equipped with

quality

greater

of

slide kit which

Option RX-3

factory

be

installed.

for mounting

cable

use

of this

banana

and low

than luv

allows

rack

terminated

option is recommended

parts

plugs.

leakage.

are

ears

This

desired.

simple mounting

are

also

the 2734A

at

each end

fail

to

during

in

It is

48 inches

cable

is

and removal

recommended.

a l9 inch

by

whenever

the first

high

equipment

quality

two

long

It is

3.7 Option

This

2734A.

repeated

TC-34

option

provides

The

use of this

transportation

rugged

a

option is

or

carrying

strongly recommended

whenever

the

case

and rechargeable

utmost

transfer

3-l

battery

if

accuracv is

the

2734A

supply for

is

to

be used for

desired.

the

4.1

General

This

section

user is

the 2734A.

The

figure

J.1.1

"CHASSIS

This

whenever

ground

2734A

.1

.1.2

''''TRANSIT MODE''
This

for

advised

paragraph

4-

terminal is

connection.

is

LED

details).

SECTION

outlines

to read

numbers

l.

GROUND"

connected

the 2134A

It

operating

is illuminated

This

from DC

LED

LED

IV

- FRONT

the

use

of each

Section

used in

Terminal

VI

this

to

directly

is

operated

is

also recommended

whenever

being illuminated

from

supply

PANEL

of the front

obtain

section

to

the chassis

AC

line

(internal

the 2734A

indicates

CONTROLS

panel

full

descriptions

correspond

of the 2734A

and

the line

that

this terminal

or external)

is

in

"Transit

that

AND

controls

of the method

to the

the 2i34A

cord

and

Mode"

reference

and

be

no AC

CONNECTORS

and

connectors,

to

numbers

should

does

grounded

1r."

is not

be

not

contain

line

cord is

S..tions

ready

whenever

the

operate

used in

grounded

a

presenr.

V

and

for

use

the

VI

{.I.3

4.1.4

.I

.I.5

,{.1.6

''BATTERY

This

LED is illuminated

(from

not have
''OVEN

This

temperature

not

temperature

use

in

''AC

This

switch

"BATTERY
This

the
indicates
invalid.

the AC

sufficient

FAULT''

LED

yet

settled from

if

this LED is

the

"Transit

ON'' LED

LED is

(on

LED

minimum

that the 2734A

is illuminated

the rear

O.K." LED

is illuminated whenever

CHARGING''

supply).

charge

LED

by more

high

regulation

LED

whenever

This LED

to maintain

whenever

than

5C. This

storage temperatures

circuitry is faulty.

illurninated.

Mode".

illuminated whenever

panel)

required

for

is not

is

in the

correct

ready

the internal

being illuminated

the

battery life

the internal

LED

being illuminated

Whichever

This

LED

is

always

position

for

use

power

of the 2134A.

and that

an AC

ON

the internal

operation

batteries

oven temperature

or, if

source is

(see paragraph

batteries

in

the 2i34A

indicates

specifications

the condition

the

extinguished whenever

that the

indicates

cause

present

or external

This

LED

the

are

internal

paragraph

in

exceeds

that

prevails,

the 2734A

and

the AC

5.1.1).

DC

supply

LED

being

indications

being

charged

bateries

2.9.

the regulation

the 2134A

the

internal

is

not ready

the 2734A

power

exceeds

extinguis6ecl

may

be

clo

has

for

is

4-l

4.1.7

''OVEN

READY''

LED

This LED

final

is illuminated

value. This LED being extinguished

4.I.8''CALIBRATION

This removable

details.

4.1 .9

"1.0V",

These terminals

"1.018V",

internal circuitry

whenever

ACCESS COVER''

gives

cover

"Y2",

provide

access to the

"10Y", "COMMON"

voltage

the

within the 2734A

internal oven

the

indicates that

calibration

and

outputs

from

from common

temperature

the

adjustments.

"GLIARD"

2734A and the

the

voltages.

mode

within

is

2734A

Terminals

is not ready

See section

0.5C of

means to

for

VIII

guard

its

use.

for

the

4-2

5.1

General

SECTION V

REAR

-

PANEL

CONTROLS

AND

CONNECTORS

The functions
paragraphs.

5.1.1

"INSTRUMENT

This

power

is

depressed,

selection is 105

lowermost.

connector,

5-2 for

5.1.2

"OVEN

This

reduces

unit

"OPERATE"

5.1.3

"EXTERNAL

The

to the 2734A.

voitages

of the rear

The

connector

ON/OFF

contains the

switch and fuses.

and

to l30v

The

selection may

this is

details

MODE"

switch selects

the internal

while

terminals

on these terminals.

on changing

Switch

maintaining

mode must

BATTERY"

provide

The

paragraph

POWER"

is

in

the OFF

if

also

the case if

either

power

power

be selected

the means

provides

fuse

panel

controls

numbers

Connector

AC

correspond

power

The

position

connector,

'll0-120v'is

only be made if

the fuses

the fuses

"Transit Mode"

consumption

to, and

Terminals

or line voltage

the temperature

whenever

and

which

by

protection

and

connectors

to the reference

AC

power

AC

if

the

lowermost,

are

switch is

"0" is

the

to be

or "Operate

of the 2734A

it is

desired

"FUSE"

an

external DC

for

the internal

are

power

depressed.

and is 210

power

cord is not

changed
selection.

Mode"

to

extend

of,

the

to tise

power

described

voltage

in

the

in

numbers

selection

position

ON

The

AC line voltage

to 260v

inserted

or inspected.

of operafion.

the battery

internal

circuitry

references.

the 2l34A.

source

against

the following

Fieure

of

switch,

if

the " l,'

,,220-240y,,is

if

into

the

See figure

Transit

life

may

mode

of

the

The

provided

be

excessive

5-1.

AC

5-l

6.1

General

SECTION VI

MANUAL

-

OPERATION

This

transportation

between laboratories.

6.2

Power

The

of sufficient

require

from

Inspection

virtually

power

6.3 When
The

i)

AND

ii)

AND

section

Connections

2734A

one

source for

is

2734A

The BATTERY

The

provides

methods recommended

has

internal

external AC

it)

from

the AC

power

unaffected

of the

source

specifications

the application.

the 2734A

is ready

OVEN READY

information

batteries

power

to

by the

Ready

for

use

O.K. LED

DC

or

input

another is

(see

power

for

Use?

whenever

LED

is illuminated

regarding

for

use

to maintain

power,

these

if it

is

automatic

Section II)

source,

thus

the following

is illuminated

the

normal

of

all

batteries

connected

2734A

the

circuitry within

and turned

and virtually

shows

the

that

user may

conditions

use of the 2734A

in

transfer

are automatically

measurements

the unit

ON. The

transient

the accuracy

select the

exist

free.

most

:

and the

in

the

charged

switch

2734A

convenient

absence

(if

js

thel'

over

iii)

AND
iv)

AND

v)

6.,1

Using the

The

GUARD

"box"

It

should

being
the COMMON

connect

DISCONNECTED

The

OVEN FAULT

The TRANSIT

The

CALIBRATION

GUARD

Terminal

terminal

completely

always

operated in

surrounding

be connected

excessively

terminal

this terminal

WHEN

LED

is

extinguished

MODE

LED is

ACCESS

on the front

the reference

to a low impedance

electrically

of the 2734A

to chassis

ground.

USING THE 2734A.

extinguished

COVER is in

panel

of the 2734A

and

noisy

will

environments.

be sufficient,

NEVER

6-l

place

output

node,

LEAVE

is internally

amplifier

circuitry

particularly

In

however

THIS

TERMINAL

connected

if

general

it may

to

of the 2:'34A.

the 2i34A

connection

be necessary

a

js

guarcl

to

to

6.5

Making

Connections

to the

27344

The

terminals on

thermal emfs are

in the connections

and/or act as

equipment, the

particularly

air,

wires

are

point

to the terminals.

heat

good

conductors

2734A

the

reduced to the

to the terminals

conductors

internal

if

temperature of

unit

the

of heat then thermal emfs can

Thus the

is near

i) Accuracies in excess of

ii)

Accuracies

iii)

Best

The

user should

impedance

output
very

possible

milliohms).

levels,

low impedances

performance

possible

in

excess of 0.5uV

accuracies

note that the type i)

levels

(typically

type

ii)

cable offers

(typically

at the cost of ease of use

5 to 25 milliohms)

made from high

are

possible.

least

if the

to or

wires

from the

the 2734A

to an air-conditioning

following

luV

3 to

: Good

cable offers ease of

good general purpose

l0 milliohms),

quality gold

Thermal emfs can

used are

terminals.

is higher

plated

not made

with

As

than

duct, thus

produced

be

wires

connection

quality

used.

and

quality

pair

wire.

good

Good
shielded cable.

Twisted
solid copper conductor,

coated

while

impedance

and

types are

"dual"

copper spade

24AWG

of

use and relatively low

performance

use at all

iii)

type

levels

tellurium copper, thus

however

pure

from

piece

any

that of the surrounding

produced

be

copper

of electronic

if the connecting

at the

recommended :

banana

(or

Teflon

at the V7

voltage

cable offers the

(typically

contact

leads mt1,

type

lug

terminated

smaller)

(or

levels and

25

high

simular)

l0V

and

best

200

to

be

prritr

Transportation

6.6
There

range of methods for

are a

of the output

described

than

precautions

6.6.1

Short-Range Moiements

For

provided

this type of
that the
CHARGING LED
movement). For
minimal

soon as the

temperature

below. Using

0.lppm can be achieved, if less

need

movements within

short

within

batteries

stabilzation time is required

OVEN

of the

voltage

2734A

specifications, the

these

taken.

be

(no

2734A

the

movement,

have

this

thus no

sufficient charge for

is

extinguished

type

READY LED

differences are

transporting

various

methods

temperature extremes, less than t hour)

a building the internal

provided

are

special

movement

of

encountered then

of shipping 2734A's transfer

accuracy and integrity is required

for

precautions

the

powered

when

it is not necessary

when

the

is illuminated

2734A

the

methods for

protection

are necessary

movement

from AC line

2734A reaches its final

the

will

this

while

each type of movement

batteries and thermal

against

(check

to select

2734A is ready

immediate).

be

maintaining

accuracies of better

loss

of integrity during

other than ensuring

the

then less

lagging

that the BATTERY

prior

to disconnection

TRANSIT

destination

for

if no major

use,

integrit)'

are

and

mode, thus

(as

6-2

6'6.2

Short or Medium-Range
For

short

or

changes

the movement

internal

or

adverse

battery

is recommended

6.6.3

shocks

excellent).

from

ready

minutes,

Long-Range

For

long range

power

AC

then

wrapping

by

Upon reception

power

AC

for

use as

immediately

for

precautions

the

followed with

also recommended

withstanding

Scientific

then
the

trunk,

extremely wide
the 2734A
mark receiving

soon

shipping

it is recommended

and should not

is

possible)

as

Movements

medium

may

range

weather

take

over one hour

supply may

that the

unit

it in weather

as

soon as

soon as

Movements

movements

extended

indicated

the

addition

that

typical shipping

container for

range

not

be

"personally" transported

intructions

on the exterior

possible

the OVEN READY

if

the conditions were

(less

or

periods

of the

the 2734A

that

be

of temperatures

(i.e.

(exposure

movements

conditions

where

(i.e.

(but

still

be used

be shielded

proof

of the 2734A

to recharge

than

30 hours)

whenever

of time

for

medium

selection

be

shipped in

shocks

it is

left

(it

purpose).

this

placed

in

the

and humidities

instructions

of

the shipping

to

ambient

the 2734A

movement

definitely

and TRANSIT

from

the

material

after the

the internal

LED

not

possible

it is

(but

less

range

from

less

weather

(plastic

movement

is illuminated (typically

severe).

that the 2734A

than

30 hours,

movements

of TRANSIT

a

shipping

is recommended

If

the 2734A

in

vehicle

passenger

the

overnight,

then it is

to unpack

container.

present

recommended

the

changes,

may

be exposed

one building

than

l8 hours)

mode is

"bubble

MODE

that

compartment,

unit

unnecessary,

conditions

pack"

the unit

batteries,

e.g. between

(6.6.2

afove)

prior

container

the user retain
is to

transported

protect

to

in

the

and apply AC

less

than

12 hours)

to large

to

another)

then

the

however

and temperature

material

should

the 2734A wili

be

within

may

be left without

facilities)

should

to shipment.

capable

of

the

in

rather

the 2734A

trunks

that

than in

of cars.

the user

power

ambient

or

is

powered

be

1

or 2

be

It is

Valhalla

a car

from

If

clearly

as

it

the

NOTE

(E.G.
RECOMMENDED.

6.6.4 Long-Range

For

user

the
when

damage

should have

Very

6.6.5
The

minimum

the

2134A
Center

the four
reception,

: IF

AIR

very

long

should

carrying

powered

and

Long-Range

2134A

of user

performance.

then

prior

internal

if

THE TRAVEL

TRAVEL

Movements

range

place

case have

thermal

movements

the 2734A

from

AC

shock,

TRANSIT

Movements

has

been designed

support, however

If very

the user is recommended

to

shipping

references

any reference

MAY

DELAYS

(less

BE

DUE

than

or

in

an

been fully

power).

MODE

charged

The
powering

while

selected if

and/or

withstand

to

adverse conditions

2734A.

the

prior

to

movement

DELAYED

TO

SNOW ETC.)

6 days)

whenever

option TC-34

the

(neither

option TC-34

the 2734A

the transit

Very

Adverse

very

a

some conditions

are expected

to consult

The

user

shipment

does

the nearest

may

and then

occur it is

6-3

BY

PREVAILING

THEN

utmost integrity

carrying

has

unit

offers

for

THE

case where

a CHARGING

protection

the entire

time is longer

Conditions

wide

range

of temperatures with

may

adversely

during

Valhalla

wish

to individually

compare

extremely

WEATHER

PROCEDURE

is required

both

the unit

against

(the

time

rhan 3

days).

then

LED

shipping

illuminatecl

2i34A

CONDITIONS

affect the integrit)'

transportation

Scientific

measure

of the

Service

each

their measurements

unlikely

that

all four

IN

the

ancl

6.6.4 IS

a

of

of

upon

references
voltage
references
Section VIII)

will

can be

themselves,

be affected,

maintained

at the

receiving

no

integrity

major

thus the

since

the other outputs

end.

of the absolute

elements effect

can then be ratiometrically

value

this output other

of the Y7

than the

calibrated

output

(see

i) Possibility

The internal

temperatures

amplifiers. However,

temperatures
source used

Nickel-Cadmium

are recommended. The

conditions,

the 2734A.

Possibility

ii)

Experience with

85C may

damaged

remove

direct

air temperature

cause

Possibility

iii)

The

between 24Y

operation

construct

(or

storage)

becomes ineffective

output

measurements.

cause

by such extreme

the internal

sunlight

surfaces

of extended

external DC

for inputs

any

voltage

very

of

low

circuitry is

low

as

as

temperatures

ovened

-40C

the internal

thus they

to maintain

should be

the

batteries have

possibility

thus the user is

very

of

high

temperatures

semiconductor

in

shifts

while

does not

their

batteries

being transported

to exceed

time

and

power

40VDC

input

down

power

source if

of the 2734A

then

of 0.lppm

(e.g.

travel in

when

even

will

not

adversely affect

lead-acid

removed

internal

excellent

temperature during movement.

and

performance

of extreme temperature

strongly recommended

(e.g.

travel in the

references

voltages,

temperatures.

and

to ensure that

attain these

even l00C in

periods.

may

be

and

the internal

I5VDC

to

length

the

becomes

the

which

extensively

2734A

is

adaquate for

is

has

also

Thus

in

these

very

high

these

connected to

circuitry of

under normal

of the

specified

Polar regions).

the

in TRANSIT

the

batteries

some

will

form

at sub-zero temperatures

to

thoroughly

equatorial

shown

the

that temperatures in

internal

the user is

2734A

the

conditions

temperatures

conditions).

any convenient

the

conditions,

journey

extended

yield

to

all

but the most

mode,

references

thus

even

and

withstand

not

of external DC

outpur

these

power

Lithium

shock

lead-acid

strongly recommended

is mainatined

(in general,

2734A will

is known.

and

worst

a

exists in these

thermally insulate

desert regions).
batteries may

the ambient

but

direct sunlight

source

maintain

thus the

If

the

power

the

case change in

decerning

source

excess

away from

of

user

journey

of

or some

and

of

be

to

can

power

may

Typical

6.7

Connections

of this

connected in

internal

bCSt iN

POTENTIALS,

Connection.s

and

typical usages

section. The

series

battery

PCTfOTMANCC

supplies

CARE MUST

and

Usages

user

should note

of

the

2734A

that

to obtain higher voltages

and the

(NOTE

THIS

-

BE

CHASSIS

MAY

TAKEN).

are

shown in

two

(or

units

terminals

when

then the

GROUND

CAUSE THE

6-4

various

the

more)

2734A

should

left

CHASSIS

figures

units

are

powered

be

open circuit

TO HAVE

at the

end

by their

for

the

DANGEROUS

THIS

SECTION

SECTION VII

IS INTENTIONALLY

REMOTE

-

LEFT BLANK

OPERATION

FOR

PROPOSED

FUTURE

DEVELOPEMENT.

7-l

8.1

General

SECTION VIII

- CALIBRATION

The 2734A

and

switches is made

Removing

8.2

panel.

preserve

A

calibration certificate

calibration

the Calibration

To remove

about 1/8".

ensure that
holes in

until they

8.3

Calibration Following

If

elapsed

range.

shorting

made

enclosure

General

8.4

The
on user

the front

are seated.

a component

since the factory

The

plugs

removing

by

top cover

Calibration

calibration

requirements

is

calibrated with

by

integrity.

the calibration

Pull

evenly

plungers

panel

has been replaced,

range

on the

on the two

are in the withdrawn

and

Component Replacement

of the

resistor

the

upper front

and then the

Philosophy

of the 2734A

:

the covers

removing

Cover

access

gently

calibration,

potentiometers

the calibration

sticker may

cover,

plungers

press

damaged

the

banks in

bezel,

upper insulation

can

be acheived in

Access

on.

be

gently pull

to remove

position.

the

cover into

by

calibration

may

be moved

reference

the

instrument

the

to the

access

placed

over the

out

the two

Line

misuse,

or

potentiometers

by changing

enclosure.

covering

one

of three

adjustment

port

cover

located

access

plungers

the

cover.

the

place.

long

a

top

cover, the reference

(see

To replace

grommets

Push

the two

period

may

Access

figure

differing

potentiometers

on

port

cover

on the

the cover,

with

up

plungers

of time

not

have

positions

the

to these

8-l).

ways,

dependant

the front

to

cover

the

has

enough

of the

plugs

in

is

i)

For most

necessary

2734A,

case it is not necessary

necessary

is

dependant

method

ii)

Where it is not
voltages (similar

be checked

the

averaging

ACCESS

will

is

outlined in

iii) When

nominal

potentiometers

usages

it

used by Valhalla

COVER

required.

be

it is required

or

removed.

8.7

below.

and for routine

to actually correct
is

to

required

only

measure

personal

on

to exactly "know"

remove

to

the

actual output
preference

Scientific Inc.

necessary

to

measurements

then

i)

above)

to adjust

of these "cells"

must

be

procedure

The

paragraph

realign

will

procedure

The

8.6 below.

to correct for

individual

the

required

be

which

periodic

for

any deviations in

the

CALIBRATION ACCESS

voltages.

and the

the outputs

but the

integrity

of each individual

will

be required.

removed,

however no

which

deviations

reference

and the

Valhalla

8-l

calibration

and record

equipment

is

outlined in

of the 2734A

Valhalla

of the actual

"cells"

of the 2734A it

the

output

the

procedure

The

available however

paragraph

to exactly

reference "cell"

In

this case the

adjustments

Scientific Inc.

then adjustments

the correct, nominal,

output

voltages

actual

absolute

CALIBRATION

of the

uses

CALIBRATION ACCESS

Scientific

Inc.

uses is

outlined in

is not

of the

values.

COVER, it

performing

for

the

8 5 below.

voltage

and

checking

potentiometers

perform

to

voltages

of the

COVER must

from

internal

paragraph

In

is

is

this

only

this

ro

of

this

the

be