FEATURES
 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 |
DESCRIPTION
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.
| Unless noted, specifications apply to each channel individually |
| RTD |
10 to 1000 Ohms, four wire with shield |
| Input Range |
±2 mV to ±10 Volts full scale. Input protected to ±50 Volts. ±200 mV to ±100 Volts with optional attenuator. |
| Excitation |
0.5 to 5 mA in 0.02 mA steps with 10 Volt compliance. |
Calibration |
Voltage substitution with attenuation of 1, 0.1 and 0.01. Single-step resistance substitution calibration, 100 Ohms, ±0.1%. |
| Gain |
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 |
110 dB @ gain 1,000, ±10 Volts, protected to ± 50 Volts. |
| Bandwidth and Filter |
1 kHz bandwidth. Four-pole low-pass filter with plug-in modules for 1 Hz to 1 kHz, 10 Hz supplied. |
| Sampling |
Up to 10k samples per second per channel. Sample & hold time correlation is ±50 nS. |
| ADC |
16-bits, two's complement output. |
| Analog Output |
±3 Volts full scale. |
|
