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8-Channel RTD / Voltage Digitizer

Model 6018


  • RTD and voltage transducers

  • Constant current excitation

  • Gains 1 to 5,000 with 0.05% accuracy

  • Automatic zero

  • Four-pole, low pass filter

  • Simultaneous sampling, 16-bit ADC

  • Programmable warnings and alarms


The Model 6018 contains eight channels of low-noise, highly stable constant current excitation, programmable gain instrumentation amplifier, filter and sample & hold.

The sample and hold outputs are multiplexed to a 16-bit analog-to-digital converter that connects to the 6000 data bus.

The 6018 is used primarly for resistive temperature devices / RTD) and voltage inputs. The input supports two-wire voltage and RTD and four-wire RTD. It can also be used for three-wire RTD and current excited bridge applications. A 100 Ohm precision resistor is provided that may be substituted for the transducer to produce a calibrated output.

Voltage substitution calibration is also provided.

Specifications Model 6018

RTD 10 to 1000 Ohms, four wire with shield
Input Range ±2mV to ±10 Volts full scale. Input protected to ±50 Volts. ±200mV to ±100Volts with optional attenuator.
Excitation 0.5 to 5mA in 0.02mA steps with 10 Volt compliance.
Calibration Voltage substitution with attenuation of 1, 0.1 and 0.01. Single-step resistance substitution calibration, 100 Ohm, ±0.1%.
Gains Programmable from 1 to 5,000 in 1, 2, 3, 5, 10 steps with ±0.05 accuracy.
Static Accuracy Typically ±0.02% for gains 1 to 1,000 following calibration.
Common Mode 110dB @ gain 1,000, ±10 Volts, protected to ±50 Volts.
Bandwidth and Filter 1kHz bandwidth. Four-pole low-pass filter with plug-in modules for 1Hz to 1kHz, 10Hz supplied.
Sampling Up to 10k samples per second per channel. Sample & hold time correlation is Up to 20k samples per second per channel. Time correlation is ±50nS.
ADC 16-bits, two’s complement output.
Analog Output ±3 Volts full scale.