Model V470

16-channel VME analog output/thermocouple simulator module

Overview

Features:
  • 16 independent, galvanically isolated analog output channels. Each channel is independently programmable for mode and output range.
  • Voltage mode: provides 16-bit resolution with programmable output voltage ranges from ±25 millivolts to ±12.5 volts.
  • Thermocouple simulation mode: simulates most common thermocouples: types J K E T R S B and N. NIST-standard lookup tables are included to allow direct entry of simulated temperatures.
  • Four non-isolated precision RTD signal conditioners for reference junction temperature sensing, plus one on-board reference junction sensor. Any thermocouple simulation channel can be associated with any reference.
  • Provision for open thermocouple simulation.
  • No realtime handshaking is required; all settings may be written to module registers at VMEbus speed.
  • Separate calibration connector allows in-crate calibration check.
  • Field-wiring termination and module I/O cabling is included in the design architecture. Standard termination panels, thermocouple termination boxes, and cables are available.
  • Support for one or two optional 8-channel J470 isothermal junction boxes, each with integral RTD reference junction sensor, or one or two J475 field-wiring interface boards.
  • A version is available with an internal full-function BIST subsystem.
  • True floating outputs: channels may be connected in series for higher output voltages.
  • Clearly labeled DIP switches set VME address: no jumpers, headers, or trimpots.
Description:

The V470 is a 6U VME module that provides sixteen independent, isolated analog outputs that may be user-programmed to operate as voltage outputs or thermocouple simulators. Users may write temperature or voltage values at VMEbus speed, and the microprocessor will transparently do all necessary calculations and update the channel electronics.

In thermocouple simulation mode, the V470 includes lookup tables for all common thermocouple types, allowing users to write the desired temperature directly to VME registers. Any channel can be associated with any of the reference junction sensors located in the external field-wiring termination panels, or can use the onboard sensor. Cold-junction compensation is via table lookup of thermocouple potential for the type currently selected. Reference junction temperatures are readable.

Two front-panel D-25 connectors interface to external analog devices. Each connector provides eight differential outputs and connections for two 4-wire RTDs. A D9 connector provides in-crate calibration check. Each isolated channel incorporates a software controlled DPDT relay that allows the channel output to be diverted to the test connector.

Up to four output channels may be series-connected to provide outputs up to ±50 volts.

An optional built-in-self-test (BIST) subsystem adds additional switching and an onboard ADC and firmware that allows the invocation of a full closed-loop test of all ranges of all 16 channels.