Signal Conditioning Module DI-8B38
DI-8B38 Strain Gage Input Module (Wide (8 kHz) and Narrow (3 Hz) Bandwidth)
● Provides gain and excitation for strain gage-based transducers (load cells, pressure sensors, torque meters, etc.)
● Interfaces to 100 Ω Thru 2 kΩ Full-Bridge Strain Gages (model dependent)
● High Level Voltage Outputs
● 1500 Vrms Transformer Isolation
● ANSI/IEEE C37.90.1 Transient Protection
● Input Protected up to 240 VAC Continuous
● 100 dB CMR
● 3 Hz or 8 kHz Signal Bandwidth
● ±0.05% Accuracy
● ±0.02% Linearity
● Low Drift with Ambient Temperature
● UL, CSA, FM and CE Certifications Pending
● Mix and Match Modules
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.
±30mV (DI-8B38-x2)
±20mV (DI-8B38-x5)
3Hz (DI-8B38-3x)
300Ω to 2kΩ (DI-8B38-x2, DI-8B38-x5)
+10V ±5mV (DI-8B38-x2, DI-8B38-x5)
100Ω to 2kΩ (Di-8B38-x1)
300Ω to 2kΩ (DI-8B38-x2, DI-8B38-x5)
2mV/V (Di-8B38-x5)
| Input Bias Current | ±0.5nA | ||||||
| Input Resistance |
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| Input Protection |
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| Excitation Load Regulation | 15ppm/mA | ||||||
| Excitation Stability | 50ppm/°C | ||||||
| Excitation Protection | 120VAC | ||||||
| CMV, Input to Output | 1500Vrms max | ||||||
| Transient, Input to Output | ANSI/IEEE C37.90.1 | ||||||
| CMR (50Hz or 60Hz) | 100dB | ||||||
| NMR | 100dB per decade above 8kHz (DI-8B38-0x only) | ||||||
| Accuracy² | ±0.05% Span | ||||||
| Nonlinearity | ±0.02% Span | ||||||
| Stability |
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| Noise (Output, 100kHz) |
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| Response Time, 90% Span |
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| Output Protection (Transient) | ANSI/IEEE C37.90.1 (Continuous Short to Ground) | ||||||
| Power Supply Voltage | Power Supply Voltage | ||||||
| Power Supply Current |
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| Power Supply Sensitivity | ±50ppm/% | ||||||
| Dimensions | 28.1 x 41.9 x 10.2mm | ||||||
| Operating Temperature | -40ºC to +85ºC | ||||||
| Storage Temperature | -40ºC to +85ºC | ||||||
| Humidity | 0 to 95% Noncondensing | ||||||
| ¹240VAC between + and -/+EXC/-EXC terminals. 120VAC between - and +EXC/-EXC terminals and between +EXC and -EXC terminals. | |||||||
| ²Includes nonlinearity, hysteresis, and repeatability. | |||||||
