Omega Products DMD-21 Installation Manual

!DMD-21

Single Cha

nnel Digital Strain Indicator

Operator’s Manual

M1244/0991

TABLE OF CONTENTS

DMD-21

SINGLE CHANNEL DIGITAL STRAIN INDICATOR

SECTION

SECTION 1

SECTION 2

SECTION 3

3.1 Front of the DMD-21

3.2 Rear of the DMD-21

SECTION 4

4.1 Full bridge configuration

4.2 Half bridge configuration

4.3 Quarter bridge configuration

4.4 Other configurations

GENERAL DESCRIPTION

UNPACKING

PARTS OF THE DMD-21

WIRING

PAGE

4.5 Internal circuit

SECTION 5

5.1 Introduction to operation

5.2 Procedure to use the DMD-21

SECTION 6

SECTION 7

SECTION 8 SECTION 9

OPERATION

RECHARGEABLE BATTERIES REPLACEMENT

ACCESSORIES

SPECIFICATIONS

BRIDGE MODE

GAGE FACTOR SETTING

8 8

12 13

satisfactory

)

m onth

for a period period to tho normal one (1) year product warranty to cover handling and shipping time. This ensures that customers

to the factory for evaluation.

immediately it

w ill be

of having boen current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating outside of OMEGA ’s control. Components which wear or which are damaged by misuse are not These include contact points, fuses, and

repaired

months from date of purchase. OMEGA Warranty adds an additional one

rt?ceive

upon phone or

maximum coverage on each product. If the unit should malfunction, it must be returr

replaced at

ta m pered

Our Customer

written request.

no charge. However, this WARRANTY is VOID if the unit shows

with or shows evidence of being damaged as a result of excessive corrosion;

Service Department will issue an Authorized Return (AR)

Upon examination by OMEGA, if the unit is found to be defect

triacs.

serv

OMEGA warrants this unit to be free of defects in materials and workmanship and to give

grE

numt

evider

con&tic

warrants

(

There

are no warranties except as stated herein. There are no other warranties, expressed or implied,

but not limited to the implied warranties of merchantability and of fitness for a particular purpose,

INC.’

ENGINEERING,

not responsible for any damages or losses caused to other equipment, whether

indirect, incidental, special or consequential, which the purchaser may experience as a result of the

includi

OME<

dire,

installati or use of the product. The buyer ’s sole remedy for any breach of this agreement by OMEGA ENGINEERIN INC. or any

breach

of any Warranty by OMEGA ENGINEERING, INC. shall not exceed the purchase pri paid by the purchaser to OMEGA ENGINEERING, INC. for the unit or units or equipment directly affect by such

Every ENGINEERING, INC.

liabilii in the

Direct all warranty and repair requests/inquiries to the OMEGA ENGINEERING Customer Service Call

FAX:

BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, YOU MUST OBTAIN AN AUTHORIZED RETURN NUMBER PROM OUR CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING

The correspondonce.

brench.

precaution for accuracy has been taken in the preparation of this manual, however,

neither assumes responsibility for any omissions or errors that may appear nor

any

for

damages that result from the use of the products in accordance with the information contain

manuill.

Departme

toll

fret?

203-359-7607,

assignrId

AR number should then be marked on the outside of the return package and on a

the

USA:

1-800-622-2378,

FAX:

203-359-7811;

International: 203-359-166

OMEC

assun-

DELAY

FOR

WAR R

following information available BEFORE contacting OMEGA:

P-0. number under which the product was PURCHASED,

Model under

Repair instructions and/or specific problems product.

OMEGA’s get

OMEGA @

any

Polk

the

latest

manner,

ANTY

RETURNS, please have the

and serial number of the product

wirrranty, and

you

are having with the

running

is to make

111

technology and engineering.

retjistered

1991

cjither

trademark of OMEGA ENGINEERING, INC.

wholly or

changes, not model changes, whenever an improvement is possible. That

any

purpose whatsoever without written permission from

for

pan

Printed in England

FOR

NON-WARRANTY

consult OMEGA for current repair/calibration Have the following information available BEFO

contacting OMEGA-

Your

1. the repair/calibration, Model and serial number of product, Repair instructions and/or specific

3’:

problems you are having with the product.

P.O. number to cover the COST of

REPAIRS OR

way

Nothing in this

OMEGA

CALIBRATIC

our

manual

custom

maY

ENGINEERING,

charg

mploduc

SECTION 1 GENERAL DESCRIPTION

OMEGA

The

either

DMD-21

115VAS

used for

directly in panel gage to be encountered in

maybe

easily

calculating the strain (see Section 4). Zero Adjustment

together output

with

is provided on the rear panci for connection to a

recorder.

The bridge circuits are supplying

2V,

selected by

Amplifier Zero

with an

Zero/Read Switch.

Inside the DMD-21 are two (2) 8.4 Volt,

Digital

microscrains

factor

dial covers

accommodat,ld

Strain Indicator, which

23OVAC,

fulL

is a single input meter which may be

bridge inputs.

on the

digit display.

the rsnge of gage factors likely

use,

but gage factors outside this range

by setting the

A Precision

is provided ensuring

ease of zero setting

ease of re-setting for subsequent tests. An analog

Refer to Figure 3-2 in Section 3.2.

10MC.

push-bcxton

Control

energizec?

Bridge

operation on

is situated on the front panel together

from an intemai source

Vtiltage

the front panel.

1.2AH

which allow the user to have a portable unit.

batteries

the

to turn off

t.;e

DMD-21

while

recharging

ocerates

Readings

are

The front

gage factor to 2.00 and

.z_d

Bridge Mode are

Ni-Cad batteries

It is advisable

(charging

given

Two-State

time is 6 hours). Once the batteries are fully charged, they last for up to 40 hours before they need to be recharged again.

The handle on the

DYD-21

doubles as a multi-position bench stand.

Press both buttons on the sides of the handle to change the angle

of the stand.

Figure

l-1

shows the DMD-21

Dioital

Strain

Indicator.

SECTION 2

UNPACKING

Remove the Packing List and verify that all equipment has been received.

If there are any questions about the shipment, please

call the OMEGA Customer Service Department at l-800-622-2378 or

(203) 359-1660.

Upon receipt of shipment, inspect any signs of damage. rough handling in transit.

Take particular note of any evidence of

Immediately report any damage to the

the container and equipment for

shipping agent.

NOTE

The carrier

will not honor

any claims

material is saved for their examination.

save

removing contents,

packing material and carton in the event

unless

After examining and

all shipping

reshipment is necessary.

Make sure the following items are in the shipping box.

Q~Y

DMD-21 Digital Strain Indicator

Description

(including integral battery pack and

recharger)

1 1

SECTION 3

PARTS OF THE DMD-21

Power Cord Operator's Manual

3.1 FRONT OF THE DMD-21

Figure 3-l shows the front of

is a description of each part

the

DIMD-21.

Following the

of the strain indicator.

figure

+ 11 hidden pages