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Model 6031, 2-Channel Transducer Amplifier-Filter-Digitizer


  • Plug-in channel configuration & calibration card
  • Voltage & current excitation including remote sense
  • Gains 1 to 5,000 with 0.05% resolution
  • 50 kHz or 100 kHz bandwidth
  • Automatic zero & balance
  • Programmable low pass filters
  • Voltage substitution gain calibration
  • Digitized & analog outputs
  • Up to 250kS/s per channel with 16-bit resolution
  • Dual buffered 10 Volt analog outputs


Model 6031 may not be regularly available. Please see Model 6030, 6060 or 6068 for similar applications.

The 6031 is a two-channel, fully programmable signal conditioning amplifier, filter and digitizer. 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, a 16-bit digitized output and a ±10 Volt analog output that can be selected for wideband or filtered response.

The signal conditioning in the 6031 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 unbalances 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 6031 employs an amplifier/digitizer-per-channel architecture, which provides high bandwidth and digitizing speed with excellent channel-to-channel time correlation. It offers the highest accuracy and completely eliminates crosstalk between channels. Using Pacific’s PI660 software zero and gain calibration and correction are automatic.

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.

The 6031 with the 6031-CC6 completion card provides two-step, bipolar, resistive shunt calibration that may be applied to internal or external bridge arms. Other completion cards have resistance substitution and series resistance calibration. Voltage substitution is usable with all completion cards and employs an external, traceable standard for gain calibration. Automatic zero and gain calibration are implemented in software.

Overview  · Input  · Excitation/Transducer Power  · Amplifier  · Filter  · Digitizer  · Calibration  · Mechanical  · Ordering Information 


Measurement Type



Strain Gage

Analog Bandwidth

50 kHz

Excitation/Transducer Power





Sample Rate (Digitizer)

Up to 200 kS/s

Analog Output

Buffered Analog Output


Connection (Bridge Input)

2 to 8 wires with shield.

Configuration (Bridge Input)

Plug-in completion card configures the channel for specific transducer and calibration types. Completion card type is read by software.

Bridge Balance (Bridge Input)

Automatic using program control. Balance accuracy ±0.04% of range, ±1 mV RTO.

Stability (Bridge Input)

±0.02% for 24 hours, ±0.005%/ºC. Bridge balance may be turned off without changing the balance setting.

Input Impedance (Bridge Input)

50 Megohms, shunted by 500 pF.

Input Protection (Bridge Input)

±50 Volts differential, ±30 Volts common mode without damage.

RTD (Input)

Two substitution resistors ±0.1%, 10 ppm/ºC.

Current (RTD Input)

Current loop calibration resistor, ±0.1%, 10 ppm/ºC.

Excitation/Transducer Power


Resistor settable +5 to +25 Volts is available on certain completion cards. Regulation is ±1%.

Monitor (Digital)

Excitation voltage, 0.5 V/V ±0.05% (0.1 V/V ±2% for Auxiliary) or current, 0.1 V/mA ±0.1%.

Monitor (Analog)

Test points for excitation and sense.

Excitation Off

Removes excitation from the transducer without changing the setting.

IEPE (6031-CC1)

Nominal 6 mA, 24 Volt compliance. User settable from 1 to 20 mA.

Voltage (Constant Voltage)

Programmable from 0 to 10.24 Volts with 2.5 mV resolution.

Current (Constant Voltage)

50 mA limited to 70 mA maximum. No damage for continuous short.

RMT Sensing

Full excitation at the transducer with up to 1 Volt line loss.

Regulation (Constant Voltage)

Each channel individually regulated, ±0.01% for ±10% line voltage change and no-load to full load.

Stability (Constant Voltage)

±0.01% for 30 days. Temperature coefficient less than ±0.005 %/ºC.

Noise (Constant Voltage)

100 µV RMS, DC to 100 kHz

Output Range (Constant Current)

Programmable 0.1 mA to 50 mA with 12 µA resolution.

Compliance (Constant Current)

0.1 to 10 V

Regulation (Constant Current)

±0.01% or ±0.1 µA for ±10% line voltage change.

Noise (Constant Current)

2 µA or 100 µV RMS, DC to 20 kHz.

Stability (Constant Current)

±0.01% or ±2 µA for 30 days. Temperature coefficient is less than ±0.005% or ±1 µA/ºC.


Input Range

±2 mV to ±10 Volts.


Programmable 1 to 5000, in 1, 2, 3, 5 steps, with ±0.05% accuracy.

Gain Stability

±0.02% for 30 days, ±0.005%/ºC.

Linearity (Amplifier)

±0.01% for gains to 1,000, ±0.02% for gains above 1,000.

Common Mode

60 dB plus gain in dB to 120 dB for balanced input and 100 dB for a 1,000 Ohm source unbalance, DC to 60 Hz.

CM Voltage

±10 V

Zero (Amplifier)

Automatic zero to ±2 µV RTI or ±1.0 mV RTO whichever is greater.

Zero Stability

±5 µV RTI, ±1 mV RTO at constant temperature, ±1 µV RTI/ºC, ±0.2 mV RTO/ºC. Short term: ±2 µV RTI, ±0.4 mV RTO for 8 hours.

Source Current

±5 nA, ±0.05 nA/ºC

Noise (10 kHz)

2.0 µV RTI plus 0.3 mV RTO, RMS.


50 kHz (6031), 100 kHz (6031HF) (-3 dB) for gains to 1,000

Slew Rate

5 V/µS


Recovery time is 120 µS to within ±0.1% for a 10 times overload to ±10 Volts.


Type (Standard Filter)

Eight-pole, low-pass Bessel (48 dB/octave).

Frequency (Standard Filter)

Four programmable filter bandwidths, 10 Hz, 500 Hz, 5 kHz, 10 kHz and wideband. Other filter frequencies are available on request.

Type (Optional Programmable Filter)

Four-pole, low-pass Bessel (24 dB/octave).

Frequency (PF)

4 Hz to 1 kHz, 1 Hz resolution, 1 kHz to 10 kHz, 5 Hz resolution, ±2% accuracy.

Frequency (PHF)

10 Hz to 1 kHz, 1 Hz resolution, 1 kHz to 20 kHz, 5 Hz resolution, ±2% accuracy.



±50 ns channel-to-channel time correlation.


16-bits, two's complement output.


Programmable up to 100 kS/s (6031), 200 kS/s (6031HF).

Digitizer Linearity

±1-1/2 LSB (±0.004%)

Continuity (Digitizer)

Monotonic to 15 bits.


Two alarms each with upper and lower limits that are programmable from negative to positive full scale. Limits checked on each ADC sample.


Voltage Substitution

Alternate input for external calibration source. Programmable 1, 0.1 and 0.01, attenuation with ±0.02% accuracy. Attenuator output may be connected to bus for calibration.

Bridge (Series)

Series calibration resistors, ±0.1%, 10 ppm/ºC.

Bridge (Shunt)

Two steps of bipolar shunt ±0.1%, 10 ppm/ºC.

Zero Calibration

Amplifier input disconnected and shorted for zero calibration.



Occupies one slot in Series 6100 enclosures.

Operating Temperature

0 to +50 ºC


Input connectors are 9-pin Type D. Outputs are a 9-pin Type D. All mates supplied.

Ordering Information 

Channel Modules

6031 - 2-Channel transducer amplifier, 50 kHz bandwidth, 100 kHz sample rate.
6031HF - 2-Channel transducer amplifier, 100 kHz bandwidth, 200 kHz sample rate.

6031-PF - Programmable filter option, 4 Hz to 10 kHz..

6031-PHF - Programmable filter option, 10 Hz to 20 kHz.

Plug-On Completion Cards1

6031-CC1 - Low impedance piezoelectric (IEPE) completion card, AC coupled, 2-20 mA.
6031-CC2 - Bridge completion card with series calibration.

6031-CC3 - Voltage completion card with Auxiliary (5-25 Volt) excitation output.

6031-CC4 - Current (4-20 mA) completion card.

6031-CC5 - RTD, potentiometer completion card.

6031-CC6 - Bridge or strain gage completion card with shunt calibration.

6031-CC7 - Strain gage completion card with series calibration.
1 Specifications are available for individual completion cards.


Model 6031
(PDF, 176KB)

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