SoMat eDAQ Bridge Layer

The SoMat eDAQ Bridge Layer (EBRG) offers 16 simultaneously sampled, low-level differential analog inputs through independent connectors. An extremely versatile layer, the Bridge Board works with both amplified and unamplified transducers, including strain gauges, accelerometers, pressure transducers, load cells, and other general analog signals.

The EBRG provides excellent strain gauge conditioning with support for 1/4-, 1/2-, and full-bridges. Automatic balancing and gain settings–as well as software selectable sample rates, excitation, and digital filtering–simplify the set-up of a strain channel. There are several calibration options, including defined value, external, multipoint and shunt calibrations with imbedded software tools. Four shunt calibration resistors per channel are also included, with software selectable shunt direction.

The EBRG is available with an optional Analog Out. Calibration files, directly compatible with popular simulation software, scale the analog outputs to engineering units.

Product Specifications

PhysicalSize: 9.2″W x 9.7″L x 1.3″H (23cmW x 25cmL x 3.3cmH)
Weight: 4.4lbs (2.0kg)
Temperature: -20° to 65° C
Connectors: (16) SoMat Female Bulkhead ConnectorInputsRange:Minimum full-scale: ±625μV
Maximum full-scale: ±10V

Resolution: 16-bit ADC, across specified full scale range

Sample Rates: Independently Set

100kHZ Master Clock= 0.1Hz to 100kHz
98.3kHz Master Clock= 0.1 Hz to 98,304Hz


Analog: 25kHz, 8-pole Butterworth low-pass filter
Digital: Software selectable; 8-pole Butterworth and Linear Phase

Strain Gage Conditioning:

Supports: 1/4, 1/2, and Full Bridge Devices
Excitation: 5V (Bipolar ±2.5) or 10V (Bipolar ±5)
Bridge Resistance:

1/2 and Full Bridge: 100 to 10,000Ω.
1/4 Bridge: Completion Resistor; specified 350Ω (EBRG-350) or 120Ω (EBRG-120)

Four shunt calibration resistors per channel:

50k Ω,100k Ω, 200k Ω, 500k Ω

Selectable shunt direction: upscale (-Sig to -Ex), downscale (-Sig to +Ex)


(16) SoMat SAC-TRAN-MP-2 Transducer Cables (2 m)

Product Options

Analog Out (EBRG-AO)The eDAQ Bridge Layer (EBRG-AO) analog outputs are conditioned output signals that can be used in the creation of time-domain lab durability tests. When setting up the laboratory simulation, the SoMat eDAQ system is brought into the lab with the component or vehicle. This practice is highly recommended, as it ensures that all of the transducer instrumentation and properties are identical for the lab simulation as they were for the field data collection. Instead of being recorded, the analog out signals are sent as time series data for the test rig to analyze. The controller can then develop drive files that are played into the test rig, reproducing exact field dynamics in the lab.Benefits:Consistency/AccuracyThe same signal conditioning, set-up file, and calibrations used in both the field and lab

Ease of Set-up

Configure the eDAQ once, use it in both applications; Analog Output Calibration File directly compatible with popular simulation software


(1) SoMat SAC-TRAN-AO-2 Analog Output Cable

Part Number Code

The following number scheme is used to identify the layer configuration.


1/4 Bridge Completion Resistor

120 Ω
350 Ω


B = Base
Layer AO = Analog Out

Cables and Accessories

Breakout Box, Analog OutThe SoMat Analog Output Box (EBB-AO) is a breakout box for the analog output option on the eDAQ EHLS and EBRG layers.M8 Hex Nut WrenchesThe SoMat M8 Hex Nut Wrenches (HDW-0034-00) work with the SoMat M8 transducer and extension cables for both the eDAQ and eDAQlite.