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Model DI-8B38-05

Isolated 300Ω to 2kΩ Strain Gage 8B-style Amplifier

$ 170 each
Limited availability, 2-8 week lead time for higher quantity
  • Provides gain and excitation for strain gage-based transducers (load cells, pressure sensors, torque meters, etc.)
  • 300Ω to 2kΩ bridge resistance
  • ±20mV input range
  • +10.0V Excitation
  • 2mV/V Sensitivity
  • ±5V Output Range
  • 8kHz Signal Bandwidth
  • High Level Voltage Outputs
  • 1500Vrms Transformer Isolation
  • ANSI/IEEE C37.90.1 Transient Protection
  • Input Protected up to 240VAC Continuous
  • 100dB CMR
  • ±0.05% Accuracy
  • ±0.02% Linearity
  • Low Drift with Ambient Temperature
  • UL, CSA, FM and CE Certifications Pending
  • Mix and Match Modules
  • View Dimensions and pinout
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DI-8B DAQ Amplifiers
This amplifier module has a plus/minus input range of 20mV.This amplifier module measures bridge resistance of 300 Ohms to 2,000 Ohms.This amplifier module excitation is 10 volts.This amplifier module sensitivity is 2mV/V.This amplifier module has 8kHz bandwidth.
This data acquisition system has a 30-day Money back guaranteeThis amplifier is manufactured in the United States of America


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 (dependent 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.



2-Position Backplane

$ 95


2-position analog I/O backplane, non-multiplexed. For use with DI-8B Modules. View the 8BP02 schematic or the 8BPxx schematic or download the pdf.


4-Position Backplane

$ 153


4 channel backplane. Each module has its own analog bus. For use with DI-8B Modules. View the 8BP04 schematic or the 8BPxx schematic or download the pdf.


8-Position Backplane

$ 228


8 channel backplane. Each module has its own analog bus. For use with DI-8B Modules. View the 8BP08 schematic or the 8BPxx schematic or download the pdf.


16-Position Backplane

$ 355


16 channel backplane. Each module has its own analog bus. For use with DI-8B Modules. View the 8BP16 schematic or the 8BPxx schematic or download the pdf.


Power Supply

Power Supply


5V DC Power Supply for use with both DI-5B and DI-8B Backplanes.


Input Range: ±30mV
Input Bias Current: ±0.5nA
Input Resistance: Normal: 50MΩ
Power Off: 100kΩ
Overload: 100kΩ
Input Protection: Continuous: 240VAC (240VAC between + and -/+EXC/-EXC terminals. 120VAC between - and +EXC/- EXC terminals and between +EXC and -EXC terminals.)
Transient: ANSI/IEEE C37.90.1
Excitation Output: +10V ±5mV
Load Resistance: 300Ω to 2kΩ
Excitation Load Regulation: 15ppm/mA
Excitation Stability: 50ppm/°C
Excitation Protection: 120VAC
CMV, Input to Output: 1500Vrms
Transient, Input to Output: ANSI/IEEE C37.90.1
CMR (50Hz or 60Hz): 120dB
NMR: 100dB per decade above 8kHz
Accuracy: ±0.05% Span (Includes nonlinearity, hysteresis and repeatability)
Nonlinearity: ±0.02% Span
Stability: Offset: ±25ppm/ºC
Gain: ±100ppm/ºC
Noise: Output, 100kHz: 1500µVrms
Bandwidth, -3dB: 8kHz
Response Time, 90% Span: 70µs
Output Range: ±5V
Output Protection: Transient: Continuous Short to Ground
ANSI/IEEE C37.90.1
Power Supply Voltage: +5VDC ±5%
Power Supply Current: 110mA No Exc. Load
150mA Full Exc. Load
Power Supply Sensitivity: ±50ppm/%
Mechanical Dimensions: 1.11" × 1.65" × 0.40"
(28.1mm × 41.9mm × 10.2mm)
Operating Temperature: -40ºC to +85ºC
Storage Temperature: -40ºC to +85ºC
Relative Humidity: 0 to 95% Noncondensing

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