DI-8B38 Strain Gage Input Modules

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Product Highlights

• Provides gain and excitation for strain gage-based transducers (load cells, pressure sensors, torque meters, etc.)
• Interfaces to 100Ω Thru 2kΩ Full-Bridge Strain Gages (model dependent)
• High Level Voltage Outputs
• 1500Vrms Transformer Isolation
• ANSI/IEEE C37.90.1 Transient Protection
• Input Protected up to 240VAC Continuous
• 100dB CMR
• 3Hz or 8kHz Signal Bandwidth
• ±0.05% Accuracy
• ±0.02% Linearity
• Low Drift with Ambient Temperature
• UL, CSA, FM and CE Certifications Pending
• Mix and Match Modules

View the DI-8B Module Selection Guide

DI-8B modules are an optimal solution for monitoring real-world process signals and providing high level signals to a data acquisition system. Each DI-8B38 module isolates, filters and amplifies a full-bridge strain gage input signal and provides an analog voltage output.

The 8B38 can interface to tranducers with a nominal resistance of 100Ω to 2kΩ depending upon the model. Bridge excitation is provided from the module with a stable 10.00V or 3.33V source. Full scale sensitivities of 2mV/V and 3mV/V are offered as standard.

Signal filtering is accomplished with a five-pole filter optimized for time and frequency response which provides 100dB per decade of normal-moderejection above the filter cutoff frequency. One pole of this filter is on the field side of the isolation barrier for anti-aliasing, and the other four are on the system side.

A special input circuit on the DI-8B38 module provides protection against accidental connection of power-line voltages up to 240VAC. Clamp circuits on the I/O and power terminals protect against harmful transients.

Isolation is provided by optical coupling to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ±5%.

The modules are designed for installation in Class I, Division 2 hazardous locations and have a high level of immunity to environmental noise.

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Ordering Information, Models, and Prices

Part Number	Bandwidth	Input Range	Bridge Resistance	Excitation	Sensitivity	Output Range	Price (US)	DATAQ Store
DI-8B38-01	8kHz	±10mV	100Ω to 2kΩ	+3.333V	3mV/V	±5V	$127	Quantity:
DI-8B38-31	3Hz	±10mV	100Ω to 2kΩ	+3.333V	3mV/V	±5V	$127	Quantity:
DI-8B38-02	8kHz	±30mV	300Ω to 2kΩ	+10.0V	3mV/V	±5V	$127	Quantity:
DI-8B38-32	3Hz	±30mV	300Ω to 2kΩ	+10.0V	3mV/V	±5V	$127	Quantity:
DI-8B38-05	8kHz	±20mV	300Ω to 2kΩ	+10.0V	2mV/V	±5V	$127	Quantity:
DI-8B38-35	3Hz	±20mV	300Ω to 2kΩ	+10.0V	2mV/V	±5V	$127	Quantity:
Accessories	Backplanes and Power Supplies.						N/A	Go to Accessories

Note: Pricing outside the U.S. will be higher to account for shipping, taxes, duty, currency fluctuation, local warranty and technical support in your country.
DI-8B Signal Conditioners have typical lead times of 2 weeks ARO.

Knowledge Base and Common Support Issues

The Importance of Isolation

Dimensions and Pinout

Connection and Calibration of Strain-Gage Based Transducers Using DI-8B38 Series Amplifiers

Strain Gage-Based Transducer and Amplifier Selection and Calibration

How To Choose Strain Gage-based Transducers for PC-based Data Acquisition Applications

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