The Keithley MTHERM-20 20-Channel Thermocouple Interface Board for METRABUS System is a thermocouple input board employing 20 differential input channels. Designed specifically for use with the METRABUS Industrial Data Acquisition and Control System, the MTHERM-20 employs a 12-bit integrating A/D converter and 20-channel MUX for reliability, accuracy and low cost. The MTHERM-20/METRABUS system is compatible with a very broad range of personal computers and bus structures including IBM PC/XT/AT and compatibles, and virtually all other large or small computers supporting data I/O via the serial input port (RS-232/422). The seven industry-standard thermocouples are supported directly (DIP-switch-selectable for J, K, T, R, S, B, or E) with data conversion to your choice of degree C or F. In addition, cold-junction compensation can be disabled for direct measurement of millivolts in any of four different full scale input ranges (0 to 76.4mV, 0 to 25mV, 0 to 15mV, or 0 to 5mV).
The MTHERM-20 is fully isolated to 500 VDC with greater than 72 dB Common Mode Rejection (35 dB NMR). Measurement resolution is 0.1 to 0.8°C (range dependent) with a measurement accuracy of 0.5°C. Signal input filtering can be implemented using a four sample-time constant (switch-selectable). Required power is +5 VDC @ 500 mA (typ) via the METRABUS cable or via an external power supply. Removable screw terminals will accept 14 AWG or smaller thermocouple wire. The MTHERM-20 interfaces to the METRABUS via a 50 conductor ribbon cable carrying data, power, and control signals to and from the board. Ground lines are interleaved with data lines to assure accurate, noise-free measurements even at lengths of 100 feet (max) from the computer. This allows MTHERM-20 positioning adjacent to its point of use for easy signal connections. The MTHERM-20 can be mounted in standard NEMA type enclosures or in Keithley's own RMT-type enclosure.
Product Family: MTHERM-20
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