Omega Products DMD-22 Installation Manual

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CHANNEL STRAIN METER

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It is the policy of OMEGA to comply with all worldwide safety and
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

EMC/EMI

regulations that

TABLE OF CONTENTS

SECTION
SECTION 1
SECTION 2
SECTION 3

3.1

3.2
SECTION 4

4.1

4.2

4.3

General Description
Unpacking
Parts
Front

Rear

Wiring

Full Bridge Configuration
Half Bridge Configuration
Quarter Bridge Configuration

PAGE

1
2
2
2

4

5

5

5

4.4

4.5
SECTION

5.1

5.2
SECTION 6

SECTION 7

5

Other Configurations

Internal Circuit
Operation
Introduction to operation
Procedure to use
Rechargeable Batteries Replacement

Specifications

a
a

12
12

13

10 Channel Digital Strain Indicator, which operates on either

1/2,

or’full bridge inputs.

‘A,

SVAC

11

230VAC,

or

is a ten input meter which may be used for

Readings are given directly in microstrain on the 4% digit display. The front panel gauge

factor dial covers the range of gauge factors likely to be encountered in use, but gauge
factors outside this range may be easily accommodated by setting the gauge factor to 2.00

and calculating the strain (see Section 4). A Precision Two State Zero Adjustment is
provided, ensuring ease of zero setting together with ease of re-setting for subsequent
tests. An analogue output is provided on the rear panel for connection to a recorder. Refer
to Figure 3.2 in Section 3.2.

5V

2V,

The bridge circuits are energised from an internal source supplying

1OVDC.

or
Bridge Voltage and Bridge Mode are selected by push button operation on the front panel.
An Amplifier Zero Control is situated on the front penal together with an Amp Zero/Read
Switch.

Inside

user to have a portable unit.

the type 6692 are two 12 volt,

It is advisable to turn off the 6692 while recharging the

1.2AH

Lead-Acid Ni-Cad batteries, which allow the

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

The handle on this instrument doubles as a multi purpose bench stand. Press both buttons
on the sides of the handle to change the angle of the stand.

Figure l-l

2

Operating Instructions

SECTION 2 UNPACKING

Remove the packing list and verify that all equipment has been received.

Upon receipt of shipment, inspect the container and equipment for any signs of damage.

Take particular note of any evidence of rough handling in transit.

immediately to the shipping agent/Courier.

i’

Report any damage

Note: The carrier will not honour any claims unless all shipping material is saved for their
examination. After removing and examining contents, save packing material and carton in

the event of a query.

Make sure the following items are in the shipping box:

DESCRIPTION

I

1

1
1

Digital Strain Indicator with integral battery pack and

charger.
Power Cord

Operators Manual

3

SECTION 3 PARTS

3.1

Front of the Strain Meter
Figure 3.1 shows the front of the instrument. Following the figure is a description of

each part of the strain indicator.

Fig. 3.1. Front

KEY

1.

2.

3.

4.

5.

6.

7.

a.

9.

Main Power Switch. A small LED light indicates that power is on.
Channel Selector Knob (position 1 through 10)
Bridge zero fine adjustment knob
LCD display (4% digits)
Amp zero switch. Switchable to either Amp Zero or Read
Amp zero control screw.

Bridge mode push buttons setting to either 2, 5 or 10 volts
Bridge mode push buttons setting to either

%

or full configuration.

%,

Gauge Factor Number; value set by user (from 1 .OO to 2.99 in 0.01 steps).

IO.

IO

Bridge balance number; one for each of
can be set from -9 up to

+9.

4

channels. Bridge balance number