Omega Products OMB-DBK43A User Manual

H-79

Model OMB-DBK43A

$

2799

⻬ Provides Eight Channels

of Strain-Gage Input

⻬ Accommodates Most

Bridge-Type Sensors,
Including 4-Element
Full and 3-Wire
Quarter Bridges

⻬ Individual Excitation

Regulator Per Channel

⻬ User-Selected Low

Pass Filter

The OMB-DBK43A eight-channel
strain-gage expansion module
for OMEGA’s OMB-LOGBOOK
and OMB-DAQBOARD-2000
Series data acquisition systems
accommodates the connection
of most strain-gage types, from
single-element, 3-wire quarter­bridges to 4-element full bridges.
The OMB-DBK43A also includes
provisions for bridge completion
resistors and provides four externally

accessible adjustments on each of
its eight channels, including
excitation voltage, input gain,
offset nulling, and output scaling.
Up to thirty-two OMB-DBK43A
modules can be connected to a
single OMB-LOGBOOK or
OMB-DAQBOARD-2000 Series,
for up to 256 strain-gage channels.

The OMB-DBK43A includes a
built-in DC/DC converter, allowing
the unit to be operated from an
external power source while
drawing very little power from
the data acquisition system.
The external power source can
be the included AC adaptor, the
OMB-DBK30A rechargeable
battery/excitation module, a car
battery, or any 9 to 18 Vdc source.

The DC/DC converter also provides
excitation voltages for all channels.
Each of its eight on-board excitation
regulators can be externally
adjusted from 1.5 to 10.5 Vdc.

The regulator outputs have remote
sensing terminals and feature
50 mA current limiting to prevent
damage from short-circuits or
overloads. The wide regulator voltage
range lets you incorporate virtually
any resistive or semi-conductive
gage type in your system.

Input Amplifier

The OMB-DBK43A’s input amplifiers
provide an input gain range of x100
to 1250.

Offset & Scaling Gain

The OMB-DBK43A’s 0 to 5 Vdc
offset adjustment range and
output-gain scaling permit nulling
of large quiescent loads and
expansion of dynamic range for
maximum resolution. This is an
important feature because strain
gages typically exhibit pre-load or
quiescent output, leading to a
non-zero output prior to the
application of the load to be
measured.

OMB-DBK43A 8-Channel Strain-Gage Module

for OMB-DAQBOARD-2000 Series and OMB-LOGBOOK

The OMB-DBK43A, $2599, shown smaller than actual size, provides 8 channels of strain-gage
input for the OMB-LOGBOOK and OMB-DAQBOARD-2000 Series

H-80

H

To Order

(Specify Model Number)

Model Number Price Description

OMB-DBK43A $2799 8-channel strain-gage module

OMB-CA-132 103 Set of 8 MINI-DIN 6 connectors with 1.8 m (6') cable

(connects strain gages to OMB-DBK43A)

Ordering Example: OMB-DBK43A 8-channel strain-gage module and OMB-CA-132, set of eight 1.8 m (6') cables with mating
Mini-DIN 6 connectors and OMEGACARE

SM

1-year extended warranty for OMB-DBK43A (adds 1 year to standard 1-year warranty)

$2799 + 103 + 150 = $3052.

Software

The OMB-DBK43A includes a
Windows program that enables you
to easily configure, calibrate, and
set up your strain- gage application.

Shunt-Calibration Feature

The OMB-DBK43A offers locations
in each channel amplifier for user­supplied shunt calibration resistors.
This feature allows you to simulate,
under software control, a pre-set
bridge disturbance to aid in
calibration and verification of each
channel setting.

Coupling & Filtering

Each OMB-DBK43A channel
features user-selectable AC or DC
coupling between the input amplifier
circuits, and a selectable 3-pole,
low-pass filter with customizable
cut-off frequency.

Bridge-Completion
Resistors

Physical locations are provided for
up to four bridge-completion
resistors per channel, allowing you
to accommodate virtually any type
of external configuration without
having to attach bridge completion
resistors to the strain gage.

Specifications

Connector: DB37 male, mates with

P1 pinout on the OMB-LOGBOOK
or OMB-DAQBOARD-2000 Series;
mini-DIN 6 provided separately for
each strain-gage & external
excitation connection

Number of Channels: 8
Excitation Voltage Adjustment

Range: 1.50 to 10.50 Vdc @ 50 mA
Input Gain Range: x100 to 1250;

separate instrumentation amplifier
for each channel

Accommodated Bridge Types:

Full bridge, Kelvin excitation

(6-wire)
Full bridge (4-wire)
Half bridge (3-wire)
Quarter bridge (2-wire)

Input Type: Differential
Input Impedance: 100 MΩ parallel

with 100 pF

CMRR: 115 dB (dc to 60 Hz)
Input Power Source:User supplied

9 to 18 Vdc @ 600 mA max
Excitation Current Output: 50 mA

max (current limited @ 60 mA)

Excitation Sensing: Local or remote
Input Offset: 200 µV max
Offset Drift: 4 µV/C°
Output Offset: 4 mV
Offset Drift: 6 µV/C°
Offset Adjustment: 0 to 100%

of range, 0 to 5.00 Vdc

Full-Scale Sensitivity Range:

At 5.00 Vdc excitation:

0.8 to 10 mV/V

At 10.00 Vdc excitation:

0.4 to 5 mV/V

Scaling Amplifier Gain Range:

x1 to 10 (15-turn trimpot)
Low-Pass Filter: 3-pole, user

selectable; corner frequency (Fc)
set by user-supplied component;
attenuation -3 dB at Fc; gain x2
(10 Hz installed)

Dimensions: 221 x 285 x 35 mm

(8.5 x 11 x 1.375")

Weight: 1.3 kg (3 lb)
Cables:

Use OMB-CA-37-x
for OMB-LOGBOOK and
OMB-DAQBOARD-2000 Series

The OMB-DBK43A’s software supports three calibration
methods: nameplate, two-point and shunt

You can easily configure the OMB-DBK43A
using its Windows software.

AVAILABLE FOR FAST DELIVERY!