Description
Bently Nevada 164746-01 Seismic Direct Input Card
Configured for high-resolution vibration signal acquisition in Trendmaster DSM architecture, the Bently Nevada 164746-01 (Seismic Direct Input Card) provides direct physical/electrical execution of seismic sensor current-loop signal digitization and conditioned waveform capture across multi-channel machinery monitoring networks.
Suffix Breakdown & Model Matrix
No validated manufacturer-defined suffix segmentation is provided for 164746-01. The identifier represents a fixed-form seismic input card assembly within the Trendmaster Dynamic Scanning Module (DSM) system.
Hardware Specifications
| Parameter |
Specification |
| Model |
164746-01 |
| Brand |
Bently Nevada |
| Origin |
USA |
| Weight |
0.3 kg |
| Dimensions |
2.4 × 11 × 24 cm |
| A/D Resolution |
16-bit |
| Input Bandwidth |
Up to 24 kHz |
| Input Channels |
Up to 8 seismic inputs |
| Transducer Type |
2-wire constant current mode sensors |
| Transducer Supply |
+24 VDC (±5%) with 3.3 mA bias current |
| Processing Modes |
Synchronous / Asynchronous |
| System Integration |
Trendmaster Pro DSM architecture |
| Signal Functions |
RMS, peak-to-peak, 1X / 2X amplitude calculation |
| Protection |
Conformal coating for moisture resistance |
Bently Nevada Seismic Signal Digitization & Cross-Channel Sampling Behavior
Within the Trendmaster DSM architecture, the 164746-01 card performs synchronized multi-channel acquisition of seismic vibration signals originating from 2-wire constant current accelerometers. The input stage maintains stable bias excitation at 3.3 mA while preserving amplitude linearity across the full bandwidth up to 24 kHz.
The onboard acquisition pipeline executes 16-bit digitization followed by real-time computation of RMS and harmonic-related amplitude components (1X / 2X). These processed values are time-aligned across DSM nodes to support distributed machinery condition monitoring. Cross-channel synchronization ensures phase-consistent waveform reconstruction for rotating equipment diagnostic interpretation.
Signal integrity is maintained through isolation of sensor excitation loops and digital processing domains, reducing susceptibility to electrical interference during high-density channel operation within multi-DSM deployments.
Frequently Asked Questions (FAQ)
Q: Does the 164746-01 support voltage-output seismic sensors?
A: No. The card is electrically designed for 2-wire constant current mode sensors only and does not support voltage-output transducers.
Q: What happens if sensor current exceeds bias specification?
A: Input channels may saturate or produce invalid digitized values, as the excitation circuit is fixed at +24 VDC with 3.3 mA bias current.
Q: Can all 8 channels operate simultaneously at full bandwidth?
A: Yes. All channels support concurrent acquisition, but total DSM system capacity must be considered for large-scale deployments.
Field Installation Guidelines
Install the card only within compatible Trendmaster DSM chassis slots. Ensure full connector seating to maintain proper backplane signal alignment. Maintain shielded cabling for all seismic sensor inputs and terminate cable shields at a single-point ground reference to reduce ground loop interference.
Route sensor wiring away from high-voltage and switching conductors to minimize electromagnetic coupling. Verify correct 2-wire constant current sensor compatibility prior to commissioning. Avoid mechanical stress on input connectors during installation or maintenance to preserve channel integrity.
