MODEL V470 VME
ANALOG OUTPUT MODULE
Also available: V450 Analog Input Module
  • 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.
  • T/C simulation mode: simulates most common thermocouples: types J K E T R S B 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.
  • Any channel may be switched to a dedicated cal connector to allow in-system calibration check.
  • VME interface operates at bus speed with no realtime handshaking.
  • Supports 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.
The V470 is 6UVME 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 uP will transparently do all necessary calculations and update the channel electronics.

In thermocouple simulation mode, theV470's lookup tables for all common thermocouple types allow users to write 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 on-board 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 on- board ADC and firmware that allows the invocation of a full closed-loop test of all ranges of all 16 channels.
MODEL V470 ANALOG OUTPUT VME MODULE SPECIFICATIONS
FUNCTION 16-channel VME analog voltage output and thermocouple simulation module.
COMPLIANCE IEEE 1014 VME; A16:A24:D16.
Does not interrupt; passes all bus grants.
Thermocouple and RTD tables based on NIST/ITS-90.
PACKAGING 6U single-wide VME module.
DEVICE TYPE 16-bit VME register-based slave: A24:A16:D16; implements 256 16-bit registers at switch-selectable addresses in the VME 16- or 24-bit addressing spaces.
OUTPUTS 16 channels, programmable functions, galvanically isolated, floating differential outputs.

Voltage output ranges ±25 mV to ±12.5 V, 10mA max.
Thermocouple simulation, types J K E T R S B N.

Output impedance < 0.25 ohms. Outputs are stable.
with capacitive loads up to 2 uF.
OUTPUT PROTECTION Differential, short or applied ±35 volts DC or peak
AC. Common-mode, ±750 volts DC or peak AC.
ESD to 15KV, human body model.
INPUTS Four non-isolated thermocouple reference junction
inputs, 100R or 1K 4-wire Pt385 RTD sensor.
INPUT PROTECTION Shorts to ground, ESD.
RESOLUTION Voltage mode, 16 bits; 0.76 uV/lsb on 25 mV range.
Temperature simulation mode, 0.0625 ºC.
RTD resolution 0.0625 ºC.
DAC ACCURACY Offset, ±50 PPM of range ±5 PPM/ºC.
Gain, ±200 PPM of range ±15 PPM/ºC.
RTD MEASUREMENT ACCURACY ±250 PPM, equiv to 0.0625 ºC, range -65 to +150 ºC.
INTERNAL REF TEMP ACCURACY ±2 ºC, range 0 to 60 ºC.
CALIBRATION INTERVAL One year.
OPERATING TEMP 0 to 60 ºC; extended MIL/COTS ranges available.
POWER REQUIRED Standard VME supplies:
+5 volts, 0.6 A max
+12 volts, 1 A max.
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Phone: 415.551-1700  Fax: 415.551-5129

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