The 6131 is a two-channel, fully programmable signal conditioning amplifier and filter. It features a plug-on signal conditioning completion card that is available for strain gage, bridge, RTD, potentiometer, voltage-mode charge, voltage and current transducers. Each channel has a programmable gain differential instrumentation amplifier, four 8-pole low-pass filters and a ±10 Volt analog output that can be selected for wideband or filtered response.
The signal conditioning in the 6131 is built around a completion card that configures it for various types of transducers.
Programmable excitation provides either 0 to 10.24 Volts constant voltage with remote sensing or 0 to 50 mA constant current excitation for strain gages, bridges, RTDs, potentiometers and other transducers requiring a highly stable source of DC power. A DC supply provides up to 25 Volts of regulated DC power and doubles as the power source for current loops and integrated electronic piezoelectric (IEPE) transducers.
The bridge input is eight-wire shielded; input (2), excitation (2), sense (2) and shunt calibration (2). Automatic bridge balancing ahead of the instrumentation amplifier accommodates large imbalances without limiting gain or dynamic range. The high impedance current source used for balancing will not cause linearity errors due to bridge loading effects.
The 6131 employs an amplifier-per-channel architecture which provides high bandwidth and offers the highest accuracy, completely eliminating crosstalk between channels. The differential instrumentation amplifier has continuous programmable gains from 1 to 5,000 with automatic zero and high common mode rejection. The standard filter is an eight-pole Bessel with four programmable bandwidths and wideband. An optional four-pole Bessel filter has continuously programmable bandwidth with resolution of 1 Hz from 4 Hz to 1 kHz and 5 Hz from 1 kHz to 20 kHz.