HP 98640A Installation And Reference Manual

HP

Computer Systems

HP 98640A

7 -Channel Analog Input Interface

Hardware

Installation and Reference Manual

FIIOW

HEWLETT

~~

PACKARD

HP

Computer Systems

HP 98640A

7

-Channel

Analog Input Interface

Hardware

Installation

and

Reference

Manual

r!J~

HEWLETT

a!1!II

PACKARD

Fli

..

HEWLETT

~I!.II

PACKARD

Warranty Statement

Hewlett-Packard products are warranted against defects

in

materials and workmanship.

For

Hewlett-Packard Desktop

Computer Division products

sold

in

the U.S.A. and Canada,

this warranty

applies for ninety (90) days from the date of delivery.* Hewlett-Packard will, at its option, repair or replace equipment which proves to be defective during the warranty period. This warranty includes

labor, parts, and surface

travel costs, if any. Equipment returned

to

Hewlett-Packard

for

repair

must

be

shipped

freight

prepaid.

Repairs necessitated by misuse of the equipment, or by hardware, software, or interfacing not provided by Hewlett-Packard are not covered by this warranty.

HP

warrants that its software and firmware designated by

HP

for use with a

CPU

will execute its programming instructions

when properly

installed

on

that

CPU.

HP

does not warrant

that the operation of the

CPU,

software, or firmware will be

uninterrupted or error free.

NO OTHER WARRANTY

IS

EXPRESSED

OR

IMPLIED,

INCLUDING,

BUT NOT LIMITED TO, THE IMPLIED

WARRANTIES

OF

MERCHANTIBILITY AND

FITNESS

FOR

A PARTICULAR

PURPOSE.

HEWLETI-PACKARD SHALL

NOT

BE

LIABLE

FOR

CONSEQUENTIAL DAMAGES.

*For other countries, contact your

local Sales and Service

Office to determine warranty terms.

~

..

HEWLETT

a:~

PACKARD

ATTENTION:

Users

of

Series

300

Computer Systems

Please read this notice ber ore installing card.

The

HP

98640A has

one

application which may pose serious usage problems:

In Series

300 machines, the right angle posts which connect the ADC

card

to

its Wire

Termination

Assembly

can

short

out

on

the RFI suppression shield

of

the processor

or

other

card

if

the cards are in

adjacent slots. Since

the

HP

98640A must

be

installed in the lower

of

paired slots, this

occurance

is

likely.

There

are

two possible solutions.

The

recommended solution

is

to

apply an insulating material (such

as

electricial tape)

to

the

upper

surface

of

the RFI shield

on

the

processor

or

other ca rd.

The

second, while more difficult.

is

equally effective: Always place

the

ADC

card

in a slot

where

the

contacts are

cl4early

not

touching any conductor. This

is

not

always possible due

to

the

installation

constraint mentioned above.

HP

98640A

7-CHANNEL

ANALOG

INPUT

INTERFACE

FOR

HP

9000

SERIES

200

COMPUTERS

HARDWARE

INSTALLATION

AND

REFERENCE MANUAL

Fliii. HEWLETT

~~

PACKARD

Card

Assembly:

98640-66501

Date Codes: A-2.419

B-2.420

HEWLETT-]PACKARD COMPANY Roseville Networks Division

ManuaIPartN~98640-90001

E0784

Printed

in

U.S.A

July

1984

8000

Foothills Boulevard

Roseville, Callifornia

95678

[ PRINTING HISTORY

The Printing History below identifies the Edition of this Manual and any Updates included. be

merged into the manual, including

the update may contain

Periodically, update packages are distributed which contain replacement pages to

an

updated copy of this Printing History page.

write-in

instructions.

Each reprinting of this manual will incorporate all past updates; however, no new

that

are

Also,

informa-

tion will be added. Thus, the reprinted copy will be identical in content to prior printings

of

of the same edition with its user-inserted update information. New editions manual

will contain new information,

FIRST EDITION

as

well as updates.

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

July 1984

this

The information contained in this document

HEWLETT-PACKARD MAKES NO WARRANTY OF ANY KIND WITH REGARD TO

MATERIAL, INCLUDING, BUT NOT LIMITED

THIS OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Hewlett-Packard shall not

sequential damages in connection with the furnishing, performance, This document contains proprietary information which

are

rights the prior

reserved.

written

No

consent

NOTICE

is

subject to change without notice.

be

liable for errors contained herein or for incidental

part

of

this document may be photocopied

of

Hewlett-Packard Company.

Copyright

(c)

1984

by

HEWLETT -PACKARD COMPANY

ii

TO,

THE IMPLIED WARRANTIES

or

use of this material.

is

protected by copyright. All

or

reproduced without

or

con-

CONTENTS

98640A Analog Input Interface

Content!l

Preface

General

GENERAL

Overview

...••.........•....................•..............•...........•...

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

Safety

]tNFORMATION

.••••• Description Standard

Options

Product

.•••...

Identification

Specification5

Electrical Functional Cont",'ol

.••.................

INSTALLATION

Unpacking and

Caut!lons

In5pect

..•.

contents.

Preparation

Calculating Component Boot-up

Switch

Factory

ID

Set~in9s

Settings.

Interrupt

Inserting

Where How Removal

the

..

....

..

Checking a

Attaching

Cabl i

Wi

re

the

nB.

. . . . . . .

.......

Connection Removal

.....

Operational Return

Shipment

Con5ideration5

••. ..•

.. ...

.

...

.

Specifications

Inspection

for

use

...

power

requirement5

installation

number.

.....

Level

..

card.

new

A-to-D

wire

card.

termination

.

..

Con5iderations.

••..........

...

..

aS5embly.

...•.

..

iii

vi

•

vi

• • 1-1 1 -1

.1-2

1-2

· .

1-2

· .

1-3

·

1-3

·

1-3

•

1-4

.2-1

·

.2-1 .2-1

·

.2-2

·

.2-2

·

.2-2

·

.2-2

·

.2-2

·

.2-4

·

.2-4

..2-5

·

.2-5

·

.2-5

·

.2-6

·

.2-7 .2-7

·

.2-8

..2-8

.2-8 .2-11 .2-12 .2-13

i

THEORY

OF

OPERATION

Power and Timing.

Powelr System Clock

Supply

.• .••.••.•.•.•.

iii

.......

.

·

.3-3 .3-3

3-3

98640A

Analog

Input

Interface

Registers

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

3-3

])ata

Registers

.•.•...•....................•..•.......••...••••••.••.••••

3-3

Pace

Timi

ng

Regi

ster

•••..•••.....•..••.•.•.•.••...••.....•••.•..••••••••

3-4

ID

Regi

ster

....•.•..................•...................................

3-4

Status

Regi

ster

..••...•......................•..............•...•.......

3-4

Analog

Circui

try

••.....•..............•.................•...•.........••..

3-5

Vol

tage

Input

..•.•...•.•....•..........••.................•.•.•...•.•••.

3-5

Channe 1

Se 1 ec t ion

.•......•...••..•

L'

••••••••••••••••••••••••••••••••••••

3-6

Prograrrrnable

Gai n Ampl

i f

ier

(PGA)

..••..•••••••.....•......•..•••••......

3-7

Gain

of

1

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

3-7

Other

Gains

.••.•...•...•....•....••...•.•.••.....•.•...••..•.••••...•.

3-9

Examp

1 e

•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

3-9

Di

fferent

ial-to-Si

ngle-Ended

Converter

...•..•.....•....•.••..•.•..•.••.

3-1 0

Example

•••••••••••••••••••••.•.••••••••••••••.•••••••••••••••••••••

3-10

Sample

and

Hold

(StH)

Circuit

•.......•.••••..••••....•••.••.••.•.•..••.

3-10

Absolute

Value

Circuit

.•••..••........••..••.•.......••..•..••••..•..••

3-11

Analog-to-Digi

tal

Converter

(ADC)

......•....•.•.•....••..•.••..•.•...•.

3-12

Corrmon

Mode

Over

range

Detect

ion

........•......•.......••.••.••....•....

3-13

Digital

Conversion

Circuitry

...••..••...••.••....•......•..•••••.•....•..

3-13

Generating

Control

Signals

.........•.•.•.•••.•....••.••.•••.•••.•.....•

3-13

Stopping

the

Counter

.••.••••.....•....••..••••••...•.•••..•.•••.•......

3-14

Conversion

Cycle

Timing

.....•....••.•..•....••.....•.••...•.••...••....

3-17

The

BUSY

eye

Ie

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

3-18

The

Internal

Pacing

Timer

•...••....•••.••••••••••.••..•.•••.•.•...•..••

3-19

External

Pacing

..•...............•........•........•..•................

3-20

Digi

tal

Backplane

Circui

try

..•.•...••....••••.••••.....•.•....••...•..••.

3-20

Select

Code

••.••••.........•••...•...••••••....•...••.••.....•....••.•.

3-20

The

Backplane

Handshake

••..•••...•••...•.....•••••..........•••...•..•.

3-21

Addressing

.•...•.•.•..•..•..•.•...•.••...••..•.....•..•..••.•••...•.•..

3-21

Reset!!

.........•..•..•.................•.....•.........................

3-22

Backplane

Data

Bus

...••..•.•....••........•.••....•••••...•.••....•.....

3-22

Reading

From

the

Card

..•...•........•..•..••••....••.........•...•.....

3-22

Wri

ting

to

the

Card

.•••..•.......••.••••..•..•.•...•.••...•.•••...•..•.

3-22

Interrupt5

.•.....•........................•............................

3-23

Sequence

of

Operations

.....•...•....•••.....•..............••.•.•..••.••.

3-23

The

Analog

Pipeline

•...•.....•••.•...••..•.••..•.•.........•..••.•..•....

3-25

PROGRAMMING

AND

EXTERNAL

PACING

Programning

Considerations

.•.....•.......•....••........•...•.••.•..•.•.•.

4-1

Channel

and

Gain

...•.•.....•.....•..•.....•..•••............•.....•.•...

4-1

Dealing

wi

th

Data

•••.•.•....•.••..•....•.....•............•....••.....•.

4-3

Calibration

.•••••..•••.....••......•....•...••.........••....•..•.....

4-3

Detailed

Calibration

...............•..............•..••....•........

4-4

Qu

i c k

Ca

lib

rat

ion.

. • . . . • . . . . . . . . • . . • . . • . . . . . . . . . . . • • . . . • . . . • . . . . . . • . 4 -5

Over

range!!

..••.••......•...•••....••......•••.......•.•.•.••.•••..••..

4-7

Horrra 1 mode

•••••••••••••••••.•••••••••••••••.••••.••••••••••••••••••

4-7

COlll'non

mode

•.•...•.....•..•........•..•....•..........•...••.•••..•.

4-

7

Simple

sample

•••.•.•.•.•.....•............••.•......•...••••••..•.•...

4-7

Pace

Interval

..•..........................•....•...•........•....••.....

4-9

No

i Sf!!

••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

4 -1 0

iv

98640A Analog

Input

Interface

External

Pac i"9

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

4-10

Control

Line5

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

4-11

Appl

iClat

ion5

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

4-11

Note

on

:8ASIC

Syntax

..••.•••••••••..••...•.•..•.•.•.....•.•..•....•...••.

4-13

MAINTENANCE

Ove

rv i ew.

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

5-1

Preparing

to

test

the

A-TO-D

card

.....••........•.••••.••.•..•••••••••••.•

5-1

Mi

nimunl

equipment

requi

rement s •••..•.....•.....••..•••.•••••.•.•.•••..••

5-1

Installing

test

assembly

..•.••..•••...•........•..•.....•.•.•...•..••.•.

5-1

Di5c1onnecting

the

WT'A

.........•.......•.........•.••.....•.•..•.......

5-1

I

nstiall

Peripherals

..•••..••...•••........•..•..•..••.•..•.••••••••...

5-2

Connecting

the

test

assembly

..••.•.•••...•.....•...........••.•.•.....

5-2

Verification

Test

.........••.....••.•...•..•......•..............•........

5-3

Ove

r v i

lew.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 3

Loading

the

verification

program

.•..•.•....•..••.•.•..•.......•....•.•..

5-3

Sequ1ence

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

5-

3

Test~5

Performed

.....................................•.........•.......

5-4

Prograrn

run

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

5-4

I

nsti~

lIed

ADCs

....•....................•...•..........•...............

5-4

Set

I~epet

i t

ions

...........................•................•..•.......

5-4

Pace

Timer

Test

.•.......•.................•.........•..•.....•.......•

5-4

Select

Readings

to

Display

.............•.....•...•••..•..•....•.......

5-4

Run-Error

Reporting

.............................•................•....

5-5

Succes~5ful

Verification

...........•.........•..•..•..•........•.•.......

5-5

On

Failure

•••..........•.....•....••.......•...•........................

5-5

Error'

Codes

....................•..........•.....•.....................

5-6

PARTS

LISTS

Organization

......................................................•.......

6-1

Ava i

lab

i

.1

i t y

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

6-1

A-to-D

card

•.•..........................................................

6-2

wire

tl~rmination

assembly

................•......•...•...................

6-5

test

a!5sembly

...•...............................•.......•..•............

6-6

DIAGRAMS

Resistor

network

......................•....•.....•..•....•........•.......

7-2

Component

Location

A-to-D

card

and

wire

term.

assy

..........•..•.........•....•............

7-3

T

est a !5 s emb

I y. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 -4

Schematic:

diagrams

A-to-D

card

.........................................................•...

7-5

wi

ret

I:!

rm.

as

sy

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

7 -11

t

est

a!5 s emb I y.

. . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

......•.•..•...........

7 -1 2

PROM

code

.................................................•............

7-13

INADVERTANT

GROUND: A SAFETY

CONSIDERATION

............••..........••..•..•.

A-1

Glossary

.......................................................•............

G-1

INDEX

v

98640A Analog

Input

Interface

PREFACE

The HP

98640A

Analog Interface

is

designed to make

putting

an

HP

9000

Series 200 computer

in

touch

with

the

IIreal

world

ll

easy. In this manual

we

explain how to install

the

interface

in

your

com-

puter.

We

also present a very simple example of

an

assembly language program

for

making a single

reading from

an

input. This example, in section four,

is

aimed

at

advanced assembly language

programmers.

This manual's Appendix briefly explains how

the

HP 98640A Analog Input Interface may

affect

an

existing application. A glossary follows

the

Appendix. Also in the back

are

two

different

reader

comment forms.

One form asks you to evaluate this manual,

the

other

asks

what

follow-on products

you may have a

future

need for.

One product

that

is

already available

is

the HP 98645A Measurement Library. The library's set

of

subroutines

that

you can call from high level languages may save considerable development time. The

following languages can call rou tines from

the

library:

BASIC

3.0 and 2.0 with

2.1

extensions

Pascal 3.0,

2.1,

and 2.0

Contact your

Hewlett-Packard

sales representative for more information about

the

HP

98645A

Measurement Library.

We

strongly recommend

the

following books to anyone who intends to write his

or

her own assembly-

language application programs

for

9000

Series 200 computers:

·Pascal 2.0 System Designer's Guide,

part

number

09826-90074

·MC68000

User's Manual,

part

number

09826-90073

If you

are

interested

in

producing applications software, ask your

Hewlett-Packard

representative

about

HP+. We can help you get

the

word

out

about your application.

vi

SAFETY

CONSIDERATIONS

I

GENERAL -This

product

and

relation

documentation

must

be

reviewed for familiarization with safety

markings

and

instruc-

tions

before operation,

CAUTION

SAfETY

SYMBOLS

Instruction

manual

symbol:

the

product

will be

marked

with

this

symbol when it

is

necessary for

the

user

to refer to'

the i n-

struction

manual

in

order

to protect

the

product

against

damage,

Indlcatt.·s

hazardous \'oltages,

Indicatt.·s

t'arth

'groundl

terminal

Isome-

tmlt.'s lIsed

in

manual

to indicate circuit

('OmnlOn

connt.·cted to grounded chassisl,

The

WARNING

sign

denotes a hazard.

It

calls

attention

to a procedure.

prac-

tice.

or

the

like.

which.

if

not

correctly

performed

or

adhered

to.

could

result

in

injury.

Do

not

proceed

beyond

a

WA

RNING

sign

until

the

indicated

conditions

are

fully

understood

and

met.

The

('A

l"rI()!\; sign d('not('s a hazard

It

calls attt.·ntion to an opt'r"t ing pron·dure. practin·.

or tht.·like. which.

ifnot

cOITectl.\'

pl'ri'ol'llwd or adht'red to. could result

in

damagt.· to or dt.·structlon of part or all of

tht.·

pl'Oduct.

Do

not proceed heyond a

CA

l'TION

sign until

the

Indicated ·condi-

tions

are

full~'

undt.·rstood

and

met.

CAUTION

STATIC SENSITIVE DEVICES

When

any

two materials make contact,

their

surfaces

are crushed on

the

atomic level

and

electrons pass

back

and

forth between

the

objects, On separation,

one surface

comElS

away with excess electrons (nega-

tively charged) while

the

other

is

electron deficient

(positively

chargt~d).

The

level

of

charge

that

is

devel-

oped depends upon

the

type

of

material. Insulators

can easily build

up

static charges in excess of 20,000

volts. A person working

at

a bench or walking across a

vii

floor can build

up

a charge of

many

thousands

of

volts.

The

amount

of

static

voltage developed de-

pends

on

the

rate

of

generation

of

the

charge

and

the

capacitance of

the

body holding

the

charge.

If

the

discharge

happens

to

go

through a semiconductor

device

and

the

transient

current

pulse

is

not

effective-

ly

diverted by protection circuitry,

the

resulting cur-

rent

flow through

the

device can raise

the

tempera-

ture

of internal junctions to

their

melting points.

MOS

structures

are also susceptible

to

dielectric

damage

due

to

high fields.

The

resulting damage can

range from

complete

destruction to

latent

degrada-

tion.

Small geometry semiconductor devices are espe-

cially susceptible to damage by static discharge.

The

basic concept of

static

protection for electronic

components

is

the

prevention

of

static

build-up where

possible

and

the

quick removal of already existing

charges.

The

means by which these charges are re-

moved

depend

on whether

the

charged object is a

conductor or

an

insulator.

If

the

charged object

is

a

conductor such as a metal

tray

or a person's body,

grounding

it

will dissipate

the

charge. However, if

the

item to be discharged

is

an

insulator such as a plastic

box/tray or a person's clothing, ionized air

must

be

used.

Effective

anti-static

systems

must

offer start-to-

finish protection for

the

products

that

are

intended

to be protected.

This

means protection during initial

production,

in-plant

transfer, packaging,

shipment,

unpacking

and

ultimate

use. Methods

and

materials

are in use today

that

provide this type of protection.

The

following procedures are recommended:

1.

All semiconductor devices should be

kept

in "antis-

tatic" plastic carriers. Made of

transparent

plastics

coated with a special

"antistatic" material which might wear off with excessive use, these inexpensive carriers are designed for

short

term

service

and

should be discarded

after

a period

of

usage.

They

should

be checked periodically to see

if

they

hold a

static

charge greater

than

500 volts

in

which case

they

are rejected or recoated, A 3M

Model 703

static

meter

or equivalent can be used

to

measure

static

voltage,

and

if needed, carriers

(and

other

non-conductive surfaces) can be recoat-

ed with

"Staticide" (from Analytical Chemical

Laboratory

of

Elk Grove Village, Ill.) to make

them

"antistatic. "

2.

Antistatic carriers holding finished devices are stored in

transparent

static

shielding bags made by

3M

Company.

Made

of

a special three-layer mate-

rial (nickle/polyester/polyethylene)

that

is

"antis-

tatic"

inside

and

highly conductive outside, they

provide a

Faraday

cage-like shielding which pro-

tects devices inside. "Antistatic" carriers which

contain semiconductor devices should be kept

in

these shielding bags during storage or

in

transit.

Individual devices should only be

handled

in a

static safeguarded work

station.

:3.

A typical

static

safeguarded work

station

is shown

below including grounded conductive

table

top,

wrist

strap,

and

floor

mat

to

discharge conductors

as well as ionized

air

blowers

to

remove charge from nonconductors (clothes). Chairs should be metallic or

made

of

conductive materials with a

grounding

strap

or

conductive rollers.

SAFETY

EARTH

GROUND -This

is a safety class I product

and

is provided with a protl,('ti\'t'

l'arthin~

terminal.

An

uninter-

ruptihle

safet~·

l'arth

ground

must

Ix-

provided from

the

main

power

sourn'

to tht, produ(·t input

wirin~

terminals,

power cord.

or

supplied

pOWt'r

cord set. Wht'fl('\'t'r

it

is likeiy

that

tht' protec-

tion

has

Ix-t'n impairt'd. thl' product

must

be madt'

inoperative

and

nt,

,.;t'(·un·d

against

an~'

unintl'ndt'd

operation.

BEFORE

APPLYING

POWER.

-

\'erif~'

that

the

product is

(:onfiJ,.rurt'd

to

match

thl'

a\'ailahll'

main

power source

per

tht'

input powt'r

confj~urati()n

in"tructions

provided in

this

manual.

If

this

product is

til

hI' l'lll'rl-:ll.l'd

\1;\

an

auto-transf()rmer

tfor

\"oltClgt'

n,duct ion I milk!'

sun'

tIll'

wmmon

tl'rminal

is connected

til tht, l',II1h (t'rminal

of

tht,

Illalll

powt'r

SCHliTt'.

SERVICING

viii

Any

servicing.

adjustment.

maintenance.

or

re-

pair

of

this

product

must

be

performed

only

by

qualified

personnel.

Adjustments

described

in

this

manual

may

be

performed

with

power

supplied

to

the

product

while

protective

covt'rs

are

removed.

Energy

available

at

many

points

may.

if

contacted.

re-

sult

in

personal

injury.

Capacitors

inside

this

product

may

still

be

charged

even

when

disconnected

from

its

power

source.

To

avoid a fire

hazard.

only

fuses

with

the

re-

quired

current

rating

and

of

the

specified

type

(normal

blow.

time

delay.

etc.)

are

to

be

used

for

replacement.

'iU·';U"hi

EYE

HAZARD

Eye

protection

must

be

worn

when

removing

or

inserting

integrated

circuits

held

in

place

with

retaining

clips.

OVERVIEW

GENERAL INFORMATION

IF'!'H',

The HP

Hewlett~Packard

for measuring small differential voltages 98640A a 117 the two

channel serves as a reference you can use

The

readings by programmatically setting automatically. voltage range or

minus 10 volts. The minimum full-scale voltage range mum voltage

The interface's cuits to thermocouples. The voltage ranges

the

by

512. This allows

volts.

The rest of this section describes

98640A

leads

HP

98640A

differential

minus one least significant bit

card.

7-channel

9000

-channel" interface because of

one channel may be shorted together

can

sample its inputs in any order. You

It

can send an

for

a channel can be changed between samples. The maximum voltage for inputs

voltage measurable

four

input

Y--ou

can select any of 4 gains

the

ADC integrated circuit

Analog

Series 200 computers. On each HP

voltage ranges will accommodate signal sources ranging from control

Input

the

interrupt

is

(Isb)

the

interface and includes

Interface

with

13-bits

in

applications where

to

correct readings made on

interface's pace timer. The

to

the

plus or minus 9.99756 volts (best case)

value).

are

for

(IC)

computer when a sample

determined by

any

on

is

an

analog-to-digital

98640A

resolution (including sign-bit). We call

an

and

grounded.

can

is

plus

the

channel. The

the

card

to

always see a voltage between 0 and 10

the

operational specifications.

8 analog channels are available

input

offset voltage

The

the

other

control

or

the

interface

minus 19.5 millivolts. The

amplification of

four

gain factors are

converter (ADC)

is

reading from

channels.

amount

will

h'as

at

of time between

then

been taken. Even

a gain

the

less tolerable

the

shorted

do

the

pacing

is maxi-

of

1 (full scale

input

voltage

1,

8,

64,

for

HP

the

plus

cir-

and

DESCRIPTION

The HP

which includes backplane plate

The second PCA are

pacing. The wire is PCA has two captive thumbscrews (dog bolts) to secure

puter. The main PCA should never be operated unless a WTA or test assembly

98640A

interface

is

not

attached

peA

the

wire

clamped in a

is

actually two

the

analog-to-digital

circuitry. Unlike most interface cards

to the main card. Instead,

plus

the

attached

termination

block's receptacle by

printed

blocks,

blocks accept individual solid hook

circuit

converter, programmable gain amplifier (PGA), pace timer,

cover plate

input

assemblies

the

plate

is

called

protection circuitry, and the control inputs for external

turning

1-1

(PCA).

for

is

attached

the

wire

a setscrew. The cover plate

the

entire

The main PCA

9000

Series 200 computers,

to the second PCA.

termination

-up

wires

assembly

assembly (WTA). On this

up

to

is

the

A-to-D

18

gauge. Each wire

attached

the

back of

attached.

the

card

and

cover

to

the

com-

98640A Analog

Input

Interface

NOTE

Additional wire termination assemblies may be ordered. By

using several assemblies you can readily switch

be-

tween

several predetermined wiring arrangements. The

assembly's

part

number

is

98640-66502.

Contact your HP representative or Hewlett-Packard's Corporate Parts Center

(CPC) to place

an

order.

Also on

the

wire

termination

assembly are 9 termination receptacles tied to chassis ground and one

receptacle tied to a low

current

(less

than

Sarna) +5 volt source,

for

use

with

the

external control

in-

puts. THIS +5 VOLT SOURCE

IS

NOT INTENDED FOR USE

AS

A POWER SUPPLY. The

ter-

mination receptacles

are

listed

in

Section

II.

STANDARD PRODUCT

When

the

HP

98640A

was ordered one

of

three options had to

be

specified. The option specified

determines

what

equipment you received. When you unpack

the

cards you may

want

to

refer

to

the

following lists:

Options

Standard Product

•

A-to-D

card,

part

number

98640-66501

• Wire

termination

assembly (WTA),

part

number

98640-66502

• Test assembly,

part

number

98640-67950

• This installation manual,

part

number

98640-90001

• Verification option (only one may

be

selected)

VERIFICA

TION OPTIONS

001

- Deletes test assembly

630

- Adds verification software on

3.5

inch disk,

part

number

98640-13301

655

- Adds verification software on 5.25 inch disk,

part

number

98640-13601

IDENTIFICA TION

Five digits and a

letter

(98640A) identify

the

Analog

Input

Interface.

As

with most

Hewlett-Packard

products used

with

9000

computers these five digits identify

the

product. The

letter

suffix represents

the

revision level

of

the

product.

The main printed

circuit

assembly or PCA (printed circuit board with all components in place) is

identified

by a part

number (also called a card assembly number) followed by a date code. On

the

1-2

98640A

Analog

Input

Interface

A-to-D

card

the

part

number

is on the component side near

the

right-angle

posts. The

part

number

is

98640-66501.

The

line of characters below

the

part

number

is

called

the

date code.

It

identifies

the

circuit

(by letter)

and

electrical characteristics (the

four-digit

encoded date).

If

there

is

a suffix

(typi-

cally a lower-case letter»)

it

identifies additional revisions

to

the

PCA.

If

the

date code on

the

A-to-D

card does not correspond to

the

date

code

printed

on the title page

of

this manual)

there

are differences between

the

interface described

in

this

manual

and

the

Analog

Input

Interfa.ce you have received. Contact your nearest

Hewlett-Packard

Sales

and

Service office

(listed

at

the

back

of

this manual) for manual update information.

SPECIFI<:A

TIONS

ElectricaJ

Power Requiirements:

.672W

(@

+12V)

.228W

(@

-12V)

+ 2.570W

(@

+5V)

3.5

Watts

total

Input

overvolltage protection: Transorbs redirect voltage

in

excess of ±

15

volts to ground.

Input

resistance, each channel: 1

OOmegohms

(power on)

WARNING

Each input

is

routed through a 1 k (one thousand) ohm

resistor

to

ground when the power is

off

..

Functional

Specifications

On-board

clock: 1.667Mhz

Resolution

of

Internally

clocked Pace rate:

600

nanoseconds

Sample and hold

aperture

time: 25 nanoseconds

Time

from

first

Read

to

Hold

at

55k

samples/second: 7 microseconds

Minimum sample cycle: 18usec.

Linearity:

0.02%

of full scale

Temperature

coefficient

for

voltage offset: 10 microvolts per degree centigrade.

Common-mo.le rejection

ratio

(CMRR): 90db @ 60hz

1-3

98640A

Analog

Input

Interface

Input voltage ranges: These ranges only specify the voltages acceptable

at

a particular gain. The

differential voltage between a channel's inputs should not equal or exeed full scale

(see

below).

1 1

GAIN

1 INPUT

VOLTAGE

RANGE

1

------------1-----------------------1

1 1

1 1 +

to -10V

1

1 1

8 1 +

to

- 1.25V 1

1 1

64 1 +

to -156mV

1

1 1

512 1 +

to

- 19.5mv 1

Other sampling characteristics are listed in table 1

-1.

Control

Minimum

external

trigger pulse width:

2.3

microseconds

Trigger voltage: +2 to

+50volts (trigger voltage must not

go

below ground)

1-4

GAIN

FULL

SCALE

LSB

RMS

NOISE*

STD

DEVIATION

OFFSET

AFTER

CALIBRATION

(WORST

CASE)**

ACCURACY

AFTER

CALIBRATION

(WORST

CASE)**

INPUT AMPLIFIER SLEW

RATE

MAX.

SAMPLE

RATE

(ACHOSS

CHANNELS) MAX.

SAMPLE

RATE

(ON

A

SINGLE

CHANNEL)

98640A

Analog

Input

Interface

Table

1-1

SAMPLING

CHARACTERISTICS

1 8

64

512

±10V

±1.25V

±156mV

±19.5mV

2.

44mV

305uV

38.1UV

4. 77uV

5mV

600uv

lOOUV

18uv

±7.3mV

±915uV

±152UV

±24uv

±18mV

±3mV

±250uV

±75uV

400mV/usec

50mV/usec

4mV/usec

40uV/usec

20k/sec

14k/sec

lk/sec

55k/sec

*

By

averaging readings noise

can

be reduced

to

less

than

one least

significant

bit

(Isb).

**

These figures

are

based on

an

HP

98640A

whose

data

were

processed

and

controlled

by

routines

from

the

HP

98645A

Measurement

Library.

The

accuracy

figures show

the

worst case

affects

of

noise

after

the

library's noise

reduction

routine

is

used.

1-5

INST ALLATION -

"-

________

----r[[]

UNPACKING AND

INSPECTION

The procedures for unpacking this interface are described below. Please follow these procedures to preserve your rights under the laws governing freight shipments

and

to protect

the

hardware. You

will find these procedures

in

many

Hewlett-Packard

hardware

manuals.

Look for obvious signs

of

damage to

the

package. If the outside

of

the

box

is

damaged or has

water

stains, or the box rattles, contact

the

carrier. Ask

that

a carrier's

agent

be present when you open

the

box.

If there

is

no obvious reason to have

the

carrier's agent present read

the

cautions below and on

the box before proceeding.

Cautions

Please read "Safety Considerations"

at

the

front

of

this manual, especially

the

portion dealing

with

static electricity.

CAUTION

The

A-to-D

card

(see

figure

2-2

for

an

outline drawing

of

this card) contains static sensitive devices. Use

anti-

static handling procedures when working

with

it.

When you re:move the A

-to-D

card from its packing material handle

it

by

the

edges

or

the

plastic

levers (extractors)

in

the

corners next to

the

right-angle

posts. Do

not

touch the gold-plated contacts

at

the

end

of

the

card opposite the

right-angle

posts.

If

you

do

get a fingerprint

on

the

gold-plated

contacts or

the

right-angle

posts, clean them

with

a lintless tissue moistened with a small

amount

of

isopropyl alcohol.

CAUTION

Never clean

the

contacts

or

the

right-angle

posts

with

an

abrasive cleaner such

as

an

eraser because

the

plating

may

be damaged.

Inspect

c:ontents

Check

the

contents of

the

package to verify

that

you have received

the

product and options you

or-

dered. Refer to

the

description of

the

Standard Product and options

in

Section

I,

and your invoice.

If

any parts appear to be missing, notify your

Hewlett-Packard

Sales and Service office.

Inspect

the

contents carefully for hidden damage such as detached components, corrosion, or cracks

and dents. Notify

the

carrier

who delivered this product and your

Hewlett-Packard

Sales and Service

office

if

you find any damage. Save

the

packing material for

the

carrier. A representative

at

our

Sales and Service office. will arrange for repair or replacement

without

waiting for

the

settlement

of

the

claim against

the

carrier.

2-1

98640A Analog Input Interface

PREPARATION FOR USE

Calculating

power

requirements

Check your computer system manual to find how much power (in watts)

is

available from the

com-

puter's power supply

at

each voltage the supply provides. Add the power requirements

at

each voltage

for all of the cards you already have

in

the computer. Then add

the

power requirements of each

A

-to-D

card you will install to the totals.

If

the power required

at

any

voltage

is

greater

than

the power supply's rating

at

that

voltage, you must make some adjustment to your computer. Either reconfigure your system by omitting unnecessary cards or arrange to buy bus expanders through your

Hewlett-Packard Sales and Service office.

Component Installation

There are

no

loose components

to

install on the A

-to-D

card or the wire termination assembly.

Boot-up

10

number

The

10

number

of

the card

is

a feature required by the operating system. The

10

register on the card

is

hardwired to respond, "18", when polled during system boot-up. The operating system also checks

the address (which

we

will explain how to set below) of the A

-to-O

card. The

10

number and address

are used by

the

operating system to associate the card with

an

application program.

SWITCH

SETTINGS

The

A-to-D

card has a DIP (dual

in-line

package) block of switches (SWl) located as shown in figure

2

-1. Switch numbers

are

on

the

switch block. These switches control the card's address and the

priority level of any

interrupt

the card transmits. You must select part

of

the address for the card.

The portion of

the

address you set on switches 1 to 5

is

called the select code. The remainder

of

the

address

is already hardwired.

If

you

use

a program which requires

the

card to send a specific level

hardware

interrupt

to the system, you must set the

interrupt

level the card will send before you install

the card

in

the computer. Figure 2-1 shows the switches set

as

they are when the

A-to-O

card leaves

the factory;

the

select code is

18

and

interrupt

level

is

3.

The logical state of any switch corresponds to the numbers 0 and 1 silked -screened on the card just

to

the right of the block

of

switches

(SW

1).

To set a specific select code or

interrupt

level just set the

switches

to

the

logical states shown in Table 2-2.

When a switch

is

closed, the bit

it

controls is low

(logical zero). When a switch

is

open, the bit

it

controls is high (logical one). You can use your

finger-

nail

or

the tip of a ball-point pen to change a switch's setting.

2-2

98640A Analog Input Interface

I

SW1

-

Ta

ble

Figure

2-1.

Standard

--.....IDDDDDDDI~

SW

1 Location

device assignments.

I

7654321

ON

SELECT

CODE

8 9

10 11 12 13 14 15

16 17

18

STANDARD

ASSIGNED

DEVICE

SELECT

98624 98626

98623 98622

98625

CUSTOM I/O

#1

CUSTOM I/O

#2

98640

CODE

2-3

ASSIGNMENTS

SELECT

CODE

ASSIGNED

19 20

21 22 23 24 25 26 27 28 29 30 31

DEVICE

98628 98629

98627

(color

COLOR

cont.)

98640A Analog

Input

Interface

Factory

Settings

NOTE

When using

BASIC

or Pascal you must use a select code

of 8

or

higher. Codes

0-7

are reserved for

the

languages'

internal

input/output

system.

The A

-·to-D card

is

shipped from

the

factory with the select code set to 1 8 and

the

interrupt

level set

to 3

(see

table

2-2

for

the

switch settings).

SW1

Switches

msb 12345

Isb

INTERFACE

SELECT

CODES

SELECT

CODE

SW1

Switches

I

SELECT

msb

12345

Isb

I

CODE

----------------+---------

---------------+--------

01000 01001 01010 01011 01100 01101 01110

01111 10000 10001 10010

10011

8

9

10 11 12 13 14 15

16

17 18

19

HARDWARE

INTERRUPI'

LEVELS

SWl

Switches

76

INTERRUPl'

LEVEL

10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111

---------------+------------

00

3

01

4

10

5

11

6

Table

2-2.

SWI switch settings

20 21 22 23 24 25

26

27

28

29

30 31

Choose a select code for the A

-to-D

card which differs from

that

of any

other

interface card in your

system.

If

you

are

using

other

interface cards

at

their IIstandard

ll

select codes, Table

2-1

will help you

locate the open select codes.

2-4

98640A

Analog

Input

Interface

Interrupt

Level

Switches 6

and

7 control

the

priority level

of

the

interrupt

the

card

can generate. The

interrupt

level

must be set before

the

card

is

installed in

the

computer. See table

2-2

if

you need

to

set

an

interrupt

level

that

differs from the factory setting

of

3.

INSERT'ING THE CARD

Where

CAUTION

Before inserting

the

A-to-O

card be sure

the

computer

or

bus expander where you are going

to

install

the

card

in

is

turned

off. Any peripherals

attached

to

the

com-

puter

or expander box should be

turned

off also.

Refer

to figure 2-2 while reading this explanation. Remove

the

cover plate from

the

computer

that

covers

the

accessory slot where you intend

to

install

the A -to-O

card. The

card

must be installed

in

any

of

the

odd numbered card slots in the card cage

of

your computer. An

odd-numbered

slot

is

a slot

just below

the

threaded mounting holes

for

a cover plate. Unlike many

I/O

devices

for

9000

Series

200

computers, a cover plate

is

not

attached

to

the A -to-D

card

so

you can actually seat

the

card

in

the

wrong slot.

How

To install

the A -to-D card

pickup

the

card by

the

corners where

the

extractors (plastic levers)

are

at-

tached.

Be

sure

the

component side

of

the

card

is

up. Check for any fingerprints

on

the

contacts of

the

top (c01nponent side) and bottom

of

the

card. Clean

the

contacts, as necessary, with a non -abrasive

cleaner. Make a final check

that

the

switches are set correctly.

I

CAUTION

I

The pressure required

to

seat

the A -to-O

card may be

sufficent to cause some

9000 Series 200 computers to

move.

Now, line

up

the

card

with

the

grooves

in

the

card cage and begin

to

gently push

the

card

into

the

grooves. Push

until

about

one-half

inch (ISmm)

of

the A -to-D

card

projects from

the

card cage.

Let

go

of

the

card, fold

the

extractor levers

flat

against

the

card and use your thumbs to push

the

card

into place

with

a firm, even pressure.

If

you push on the extractors

there

is

less of a chance you will

accidentally damage one of

the

right-angle

posts.

WARNING

THE

RIGHT-ANGLE

POSTS

ARE SHARP ENOUGH

TO CUT YOU

IF YOU PUSH ON THEM.

2-5

98640A Analog

Input

Interface

~

A-to-D

CARD~~

THREADED

~

HOl

MA TING CONNECTORS

~

RIGHT

-ANGLE

~'

POSTS

/

EXTRACTO~~~

~

WIRE

TERMINA

TION

ASSEMBLY

Figure 2 -

The

A-to-D puter. When correctly installed of each extractor touching or almost touching the card cage.

Removal

card must seat

The following instructions for removing card assume you have properly powered puter plained in Section 5 "DISCONNECTING THE the power on yet,

in

order for the wire termination assembly

the

card's extractors will

and removed the wire termination assembly

then

2.

Installation

be

I

CAUTION

WTAII.

the instructions below apply.

2-6

I

under

If

folded

you have not

flat

the

-down

the

the heading

to

fit

on the back

against the card with one edge

A-to-D

com-

as

ex-

turned

of

the

com-

98640A Analog

Input

Interface

To remove

the A -to-D

card, pull the edge of

the

extractors nearest

the

right-angle

posts outward.

As

the extractors swing outward

their

tips will pivot against

the

card cage and jack the card free

of

con-

nectors

at

the

other

end. When the card

is

free

of

the connector, grasp

the

corners of

the

card

and

slowly slide

it

out

of

the card cage.

Checking a

new

A-to-D

card

This

is

a good time to checkout the card's

operation--before

the

wire termination assembly

is

at-

tached. See Section 5 under the heading "Preparing to Test

the

A-to-D

Card". Once you have

verified the

card

is

operating correctly,

return

to this section for

an

explanation of installing the wire

termination assembly.

ATTACHING

THE WIRE TERMINATION ASSEMBLY

Refer to figure

2-2

for help installing the wire termination assembly. Pick up the wire termination

assembly

and orient

it

such

that

the thumbscrews line up

with

threaded holes in the card cage

and

the

mating connectors for

the

right-angle

posts on the

A-to-D

card

are

also lined up.

Push the cover plate forward

until

the mating connectors engage the posts and the thumbscrews just

enter

their

respective holes in the card cage. Tighten both screws simultaneously

or

they may bind.

Tighten until

the

cover plate

is

seated against the card cage's outside edges. Tighten only finger tight;

over-tightening

may

strip

the

threads of a thumbscrew or the card cage.

I

CAUTION

I

The right-angle posts must properly engage

the

mating

connectors on

the

wire termination assembly. There

is

a

connector for every post and no extras. The

A-to-D

card

and/or

the wire termination assembly may

be

damaged

if

power

is

applied with a post shorted to

the

cover plate

or

in the wrong receptacle

of

the

mating connector.

If

the

thulmbscrews bind do not force them. Unscrew the assembly

and

try

again. If,

after

several trys

you are unable to seat the cover plate you may have defective screws.

Please contact

the

nearest

Hewlett-f1ackard Sales and Service office.

If

the

thumbscrews are defective, we will help you obtain a

replacement wire termination assembly. Do not

attempt

to substitute conventional screws for

the

thumbscrews as you will void your

warranty

and may damage the card cage.

I

CAUTION

I

The

A-to-D

card may be damaged if the

entire

Analog

Input

Interface

is

not properly installed.

Hewlett-Packard

will not support

an

improperly

as-

sembled Analog Input Interface. You must operate

the

A

-to-D

card with

either

our

wire termination assembly

or

our

test assembly installed.

2-7

98640A Analog

Input

Interface

The wire

termination

receptacles on

the

wire termination assembly

are

arranged

as

shown

in

figure

2-3.

You can open

the

throat

of

each receptacle by turning

the

screw above

that

receptacle

counter-

clockwise

(as

viewed from above)

with

a small, straight-bladed screwdriver.

CABLING

Wire

Since the

HP

98640A

Analog

Input

Interface measures differential voltage there must

be

at

least two

conductors coming from

the

voltage source you will measure. Your voltage source should have its own

ground reference in

any

circuit

that

includes

the

interface.

Where desired shielded cable may be used

for

the

hook

-up.

For easy hook up to

the

wire termination assembly, we recommend insulated solid

wire

of

any American Wire Gauge (awg) between 28 to

18

inclusive. Stranded wire may

be

used

but

should

be

tinned with solder

to

hold

the

strands together.

Connection

NOTE

You must provide strain relief for

the

wires

attached

to

the

wire

termination

assembly. The wire termination

as-

sembly

is

not

designed to support

the

weight

of

a large

cable

or

long lengths of individual conductors.

WARNING

THIS INPUT INTERFACE WILL APPEAR TO BE A LOW-RESISTANCE PATH TO GROUND FOR ANY VOL T

AGE

MORE THAN I 5

VOL

TS ABOVE OR

BELOW GROUND.

WHEN POWER TO THE COMPUTER

IS

TURNED OFF

EACH INPUT

IS

SHORTED TO GROUND THROUGH

A ONE THOUSAND OHM RESISTOR REGARDLESS

OF

THE VOLTAGE ON THE INPUT.

Open

the

throat

of

the

receptacle where you will install a wire by

turning

the

screw above

the

open-

ing counter-clockwise

(as

viewed from from above). Set the wire you will use in your

strain-relief

device

but

leave enough slack

to

reach the

termination

assembly and allow for stripping

the

wire.

Strip between

one-quarter

and

9/32

inch

(6

to 7 millimeters)

of

insulation from

the

end of

the

wire.

Insert

the

bare wire

into

the

receptacle and

turn

the

screw clockwise (as viewed from above)

until

the

wire

is

held firmly. Do

not

over

tighten

the

screw

as

you may damage

the

termination

block

or

the

slot

in

the screw's head.

2-8

9 8640A Analog Input Interface

-

.-

1000.-

(!]]I[

--

----

r--

<D

1.

GROUND

CD

-

<D

2.

- INPUT } CHANNEL 0

3.

+ INPUT

<D

4.

GROUND

CD

-

i

<D

I

-

<D

5.

-INPUT}

CHANNEL 1

6.

+ INPUT

7.

GROUND

<D <D

8.

-INPUT}

9.

+ INPUT

CHANNEL

2

<D

10.

GROUND

<D

-

11.

-INPUT}

CHANNEL3

12.

+ INPUT

<D

-

13.

GROUND

COMPONENT

<D

I

SIDE

<D

14.

-INPUT

}

CHANNEL4

15.

+ INPUT

II:

<D

I

<D <D

-

16.

GROUND

17.

-INPUT}

18.

+ INPUT

CHANNEL5

<D

19.

GROUND

<D

20.

- INPUT } CHANNEl.. 6

21.

+INPUT

<D

-

22.

GROUND

<D

-

<D

-

23.

- INPUT } CHANNEL 7

24.

+ INPUT

<D

-

25.

GROUND

<D

26.

NOT CONNECTED

<D

~

27.

NOT CONNECTED

<D

-

28.

+5V

@ <

50ma

<D

29.

EXTERNAL

PACE

INPUT (EPCON)

<D

-

30.

INTERNAL

PACE

DISABLE (lPACDA)

i-...-

,.--.

I.......-

m

-

"---

Figure 2-3.

Wire

termination

assembly inputs.

2-9

98640A

Analog

Input

Interface

Figure 2-·4 shows

the

two

recommended

hook ups

for a reference

channel.

Any

channel

may

serve as

a

reference

channel.

If

you

determine

by

experiment

that

the

offset

voltages

on

an

input

channel

are

acceptable

in

your

application, you

can

use all 8

channels

for

making

measurements.

Figure

2-·5 shows a

few

ways

to

wire a

channel

so

a voltage source

can

be measured. Appendix A

shows a possible

circuit

application.

There

are

many

circuits

into

which

the

interface

can

be added

to

make voltage measurements. We will

not

try

to list

them

here.

Figure

2-6

has examples

of

hook

-ups

which

are

not

recommended.

The

two

problems

the

wiring

ar-

rangements

in

figure

2-6

cause

are

ground-loops

or

over voltage

on

an

input.

A

ground-loop

will

contribute

unwanted

noise

to

the

input

voltage. Also,

if

the

difference

in

potential

between

chassis

grour:d

and

the

voltage source's

ground

is

high enough,

the

current

limiting

resistor

on

the

wire

ter-

mination

assembly

may

be damaged.

Once you have finished

adding

the

wires to

the

wire t.ermination assembly

and

the

voltage sources you

may

'''Vish

to

use cable ties to

form

the

wires

into

bundles.

If

you

have

several wire

termination

as-

semblies you

can

fabricate

several wire bundles allo\\ ing a

rapid

change

of

the 7 or 8 circuits

you

are

making

your

measurements

from.

+

CHANNEL

11

CHANNEL

11

9 GND

TERMINAL

r-h

GND

TERMINAL

I

rT7

1"

I I I

Figure

2-4.

Wiring a reference

channel.

CAUTION

Read Appendix A

before

you

configure

your

system.

The

resistance

between

any

input

and

ground

is

low

when

the A -to-D

card's host

is

powered down.

2-10

98640A

~?7

GND

I , ,

Analog

Input

TERMINAL

Interface

SOURCE

SOURCQE

Removal

C=!===========3(3C~

':;6I~=)~J

===-=--=--=--=--=--=--=--=--=-

Figure

2-5.

Wiring a channel's inputs.

WARNING

__

~(~_---lJ~1

~

CHANNEL

OGNDTERMINAL

I

rl-7

, , ,

C : CHANN E L

Q GND TERMINAL

/l7

."

7]

THESE INSTRUCTIONS FOR REMOVING THE WIRE TERMINA TION COMPUTER SAMPLED ARE

READ APPENDIX A BEFORE POWER OFF.

ASSEMBL Y ASSUME THE

AND

THE VOLTAGE SOURCES BEING

TURNED

OFF. IF THEY ARE NOT,

TURNING

2-11

THE

98640A Analog

Input

Interface

SOURCE

$

SOURCE

-=-

FLOATING

= SOURCE

x

0

~

'"

'~,

, , ,

-

OR

+

CHANNEL

"7

+OR

-

GND

TERMINAL

+

CHANNEL"7

GND

TERMINAL

+

CHANNEL

"7

GND

TERMINAL

Figure

2-6.

Unacceptable

wiring of

the

inputs.

Be

sure there

is

enough slack in the wires

attached

to

the

wire

termination

assembly

to

allow the

as-

sembly to be pulled straight back.

If

there

is

not

enough slack you will have to remove

the

wires or

release

them

from

the

strain relief.

Remove

the

assembly by unscrewing

the

two thumbscrews simultaneously

to

avoid binding caused by

the plate not coming

off

straight.

Be

prepared to support

the

wire

termination

assembly as the screws

run

out. Pull

the

assembly straight back, away from

the

card cage, to avoid bending the the

right-

angle posts on

the

A-to-D

card.

Do not use the wire termination assembly to hang

up

your wire bundle. The weight

of

the

wire may

cause damage to

the

assembly or

the

wires might slip

out

of

the

receptacles.

OPERA

TIONAL

CONSIDERA

TIONS

The bottom

of

the

wire

termination

assembly

is

exposed; do

not

allow conductors to come in contact

with

the

bottom of

the

assembly when

it

is

installed.

If

the

computer

is

turned

on

or

there

is

a voltage

present on one of the channels, a

short-circuit

may result. The

current

through

the

short-circuit

may

be

enough to damage the voltage source

or

the

metal traces on

the

wire

termination

assembly,

or

both.

If the traces on

the

wire

termination

assembly

are

damaged, you may purchase a replacement

through

your

Hewlett-Packard

Sales and Service office or our Corporate Parts

Center

(CPC). The

part

number

is

given in

the

description of the standard product in Section

1.

2-12

HP 98640A Installation And Reference Manual

Specifications and Main Features

Frequently Asked Questions

User Manual