3B32

Interfaces, amplifies, & filters a process-current input. Process-current input signals are measured by reading the voltage across an external precision 100 resistor (supplied with module).
Module provides simultaneous precision voltage and current outputs. Module circuitry can withstand 220v rms at the input screwterminals. All 3B32 series modules are mix-and-match and Hot Swappable.

Industrial signal conditioning Industrial signal isolation Industrial signal filtering

The 3B32 is a single-channel signal conditioning module that interfaces, amplifies and filters a process-current input and provides simultaneous precision output voltage and current. Process-current input signals are measured by reading the voltage across an external precision 100 resistor (supplied). Model 3B32 performs complete signal conditioning, including isolating (+1500V peak input-to-output and power) and protecting their computer side outputs from damage and loss of signal integrity, and shielding their inputs from damage from field-side over-voltage faults up to 220V rms. The current output withstands 130V rms without damage and interfaces user equipment through screw terminals located on the 3B Series backplane. Each plug-in, mix-and-match, hot-swappable module is easily field calibrated via front-panel zero and span adjustments for both voltage and current outputs.

3B Series Custom-Ranging Program Externallyprogrammable Model 3B32-00, enables the user to configure a special input range by using the optional plug-on AC1310 ranging card, which houses user-supplied resistors to determine zero and span. To facilitate selecting resistors, a Windows program, 3B-CUSTOM, calculates resistor values based on the user-desired input/output ranges.

A chopper-stabilized low-drift (+1uV/oC) input amplifier assures long-term stability. At the amplifier input, a stable, zero-scale input voltage is subtracted from the input signal to set the zero-scale value. Zero suppression can exceed 100% of the input range. This is ideal for expanded-scale applications requiring high-resolution measurement of a selected portion of an input signal. For user convenience, the zero and span can be factory configured to meet custom range needs (Model 3B32- CUSTOM) or can be externally programmed (Model 3B32-00) via user supplied resistors inserted in the optional AC1310 plugon ranging card. Internal low-pass filtering with a 3Hz cutoff (- 3dB) two-pole Butterworth filter enhances both 60 dB normalmode and 160 dB common-mode rejection at 50/60 Hz, enabling accurate measurement of small signals in high electrical noise.

Signal isolation is accomplished by transformer coupling with a proprietary modulation technique for linear, stable and reliable performance. The differential input circuit on the field side is fully floating, eliminating the need for any input grounding. A demodulator on the computer side of the signal transformer recovers the original signal, which is then filtered and buffered and drives a voltage-to-current converter to provide the current output.