V470 16-channel VME analog output/thermocouple simulator 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
- 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
- Includes four non-isolated precision RTD signal conditioners for reference junction temperature sensing, plus one onboard reference junction sensor
- Any thermocouple simulation channel can be associated with any reference
- Any channel may be switched to a dedicated calibration 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
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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.
| FUNCTION | 16-channel VME analog voltage output and thermocouple simulation 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 |
| CHANNELS | 16, programmable functions, galvanically isolated |
| RANGES | Programmable per channel Voltage: 10 bipolar ranges, ±25 mV, 50 mV, 80 mV, 125 mV, 250 mV, 500 mV, 1.25 V, 2.5 V, 5 V, 12.5 V Thermocouples: Types J K E T R S B N |
| RESOLUTION | Voltage mode, 16 bits; 0.76 µV/LSB on 25 mV range Temperature simulation mode, 0.0625°C |
| OFFSET ERROR | ±50 PPM of range ±5 PPM/°C |
| GAIN ERROR | ±200 PPM of range ±15 PPM/°C |
| OUTPUT IMPEDANCE | 0.25Ω max |
| OUTPUT CURRENT | 20 mA min into short circuit indefinitely |
| OUTPUT LOADING | Stable for capacitive loads up to 2 µF |
| OUTPUT PROTECTION | Differential, short or applied ±35 V DC or peak AC Common-mode, ±750 V DC or peak AC ESD to 15 KV, human body model |
| RTD INPUTS | Four non-isolated thermocouple reference junction inputs, 100 R or 1 K 4-wire PT 385 RTD sensor |
| RTD ACCURACY | ±250 PPM, equiv to 0.0625°C, range -65 to +150°C |
| INPUT PROTECTION | Shorts to ground, ESD |
| ONBOARD SENSOR | Semiconductor reference junction temperature sensor, ±2°C typical accuracy |
| OPERATING TEMPERATURE | 0 to 60°C; extended MIL/COTS ranges available |
| CALIBRATION INTERVAL | One year |
| POWER | Standard VME supplies: +5 V, 0.6 A max +12 V, 1 A max -12 V, 5 mA max |
| CONNECTORS | 2 D25 female for channels and RTDs D9 male for test |
| INDICATORS | LEDs indicate VME access, CPU activity, error conditions Additional user programmable LED |
| PACKAGING | 6U single-wide VME module |
| CONFORMANCE | ANSI/VITA 1-1994 (R2002) VMEbus spec; does not support byte writes Thermocouple tables based on NIST/ITS-90 RTD tables per IEC-751 for "385" curve RTDs |
Block Diagram: V470 analog output/thermocouple simulator module
V470-1: 16-Channel VME Analog Output and Thermocouple Simulator Module
V470-2: 16-Channel VME Analog Output and Thermocouple Simulator Module with BIST
V470-3: 16-Channel VME Analog Output and Thermocouple Simulator Module with BIST and Extended Temperature Ranges
J470: 8-channel D25 female isothermal termination box
J475-1: 8-channel D25 female Din rail termination panel
J475-2: 8-channel D25 female Din rail termination panel w/ reference junction sensor
J55: 6' shielded D25 male to D25 male cable
J56: 10' shielded D25 male to D25 male cable
J71: Dual D9 male to Agilent 34104A cable