The 3B series of signal conditioning I/O subsystems provide a low-cost, versatile method of transferring analog transducer signals to a data acquisition, monitoring or control system without the inherent noise, non-linearity, drift and other influences.
The 3B20 is a wideband single‑channel signal‑conditioning module that interfaces 4‑arm AC bridge transducer signals ranging from 1.5 mV rms to 150 mV rms. It provides simultaneous precision voltage (‑10 V to +10 V) and current (4‑20 mA) outputs, as well as an AC excitation voltage of 2 V rms to 10 V rms selectable between 1 kHz and 10 kHz. The module is hot‑swappable, mix‑and‑match, and includes front‑panel zero and span adjustments.
The handbook includes functional block diagrams, pin‑out tables, mechanical dimensions, environmental ratings, and detailed specifications such as accuracy (+0.1 % span), input protection up to 130 V rms, and isolation of +1500 V peak. It also outlines customization options via the 3B‑CUSTOM program and optional ranging cards.
| Input range | 1.5 mV rms to 150 mV rms |
|---|---|
| Excitation voltage | 2 V rms to 10 V rms |
| Current output range | 4 mA to 20 mA |
| Accuracy (span) | ±0.1 % of span |
| Input protection voltage | 130 V rms maximum |
| Isolation rating | +1500 V peak isolation |
| Operating temperature range | -28 °C to +85 °C |
| Mechanical dimensions | 3.15" × 3.395" × 0.775" (80 mm × 86.2 mm × 19.7 mm) |
The module accepts input signals from 1.5 mV rms up to 150 mV rms from 4‑arm AC bridge transducers.
The module can generate an AC excitation voltage from 2 V rms to 10 V rms, selectable between 1 kHz and 10 kHz.
The input and excitation terminals are protected up to 130 V rms.