3B16

Rev. 0 | Page 2 of 8

GENERAL DESCRIPTION

The 3B16 is a single-channel signal conditioning module which

interfaces, amplifies, and filters signals from 4-arm full-bridge

strain-gage bridges with a resistance from 300W to 1kW. The

module provides a constant +10V bridge excitation voltage and

provides simultaneous precision voltage and current outputs.

The user-configurable Model 3B16-00 can be applied in

applications involving large tare weights which must be

compensated with zero suppression. The 3B16 protects the

computer side from damage due to field-side over-voltage faults

up to 130V rms. In addition, the current output withstands

130V rms without damage and interfaces user equipment

through screw terminals located on the 3B Series backplane.

The 3B16 is a plug-in, mix-and-match, hot-swappable module

which is easily field calibrated via front-panel zero and span

adjustments for both voltage and current outputs.

3B Series Custom-Ranging Program – Externally-

programmable Model 3B16-00, enables the user to configure a

special input range, including tare weight suppression, 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.

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 3B16-

CUSTOM) or can be externally programmed (Model 3B16-00)

via user supplied resistors inserted in the optional AC1310 plug-

on ranging card. Internal low-pass filtering with a 3 Hz cutoff

(-3dB) two-pole Butterworth filter enhances a 60 dB normal-

mode rejection at 50/60 Hz, enabling accurate measurement of

small signals in high electrical noise.

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Figure 2