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330-668-1444Model DI-8B38-31
Isolated 100Ω to 2kΩ Strain Gage 8B-style Amplifier
- Provides gain and excitation for strain gage-based transducers (load cells, pressure sensors, torque meters, etc.)
- 100Ω to 2kΩ bridge resistance
- ±10mV input range
- +3.333V Excitation
- 3mV/V Sensitivity
- ±5V Output Range
- 3Hz 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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Description
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.
Accessories
Description
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.
Description
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.
Description
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.
Description
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.
Description
5V DC Power Supply for use with both DI-5B and DI-8B Backplanes.
Specifications
| Input Range: | ±10mV |
| 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: | +3.333V ±2mV |
| Load Resistance: | 100Ω 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: ±75ppm/ºC |
| Noise: | Output, 100kHz: 200µVrms |
| Bandwidth, -3dB: | 3Hz |
| Response Time, 90% Span: | 160ms |
| 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 |
Articles
Learn the Importance of Isolation In Four Easy Lessons
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
Bandwidth and DI-8B/DI-5B Series Signal Conditioning Modules
