V450 16-channel VME analog/thermocouple input module

Analog/Thermocouple Input Module - V450
  • 16 channels of fully isolated analog input acquisition, each independently programmable for mode and input range
  • 24-bit voltage mode ranges from ±25 mV to ±250 volts
  • 1/16 °C thermocouple mode supports types J K E T R S B N
  • Four non-isolated precision RTD signal conditioners, plus one on-board temperature sensor
  • Continuous error-free detection for open thermocouples
  • Thermocouple loop resistance reporting for long-term system reliability
  • No realtime handshaking required; once channel parameters are set up, measurements appear in dual-port memory registers with VMEbus-speed access
  • Test connector supports in-crate calibration check, optional built-in self test (BIST) available
  • Clearly labeled dipswitches set VME address; no jumpers, headers, or trimpots
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The V450 is a 16-channel 24-bit VME isolated analog-to-digital converter module which can acquire a wide range of DC voltages, including thermocouple readings with automatic cold junction compensation. Each channel is independently isolated with it's own A/D converter, signal conditioning, input protection circuits, and test relay.

All data I/O is managed through a transparent, VMEbus-speed dual-port memory. Conversions are continuously available with no need for handshaking; provisions are available for synchronized simultaneous data acquisition.

Programmable parameters such as voltage input range, thermocouple type, and sample rate, and data acquisition results and status flags are accessible in per-channel VME registers. Independently programmable digital filters and optional plug-in analog front-end filters simplify data-acquisition systems on both software and hardware sides.

Thermocouple channels can be individually programmed to work with any of four external RTD reference junctions, or thermocouple wire can be brought directly into the front panel D25 connectors and referenced to the on-board temperature sensor. Cold-junction compensation uses high-density table lookups rather than straight line approximations, and all reference junction temperatures are readable at any time.

FUNCTION 16-channel isolated voltage/thermocouple input
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: 14 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, 25 V, 50 V, 125 V, 250 V
Thermocouples: Types J K E T R S B N
RESOLUTION Voltage mode, 24 bits
Temperature mode, 0.0625°C
SAMPLE RATE Programmable per channel, 4 to 500 readings/second
Default rate of 16/second rejects 50/60 Hz noise
OFFSET ERROR Range < 1 V: ±10 PPM of range ±1 µV
Range > 1 V: ±10 PPM of range ±20 µV
GAIN ERROR Range < 1 V: ±100 PPM ±15 PPM/°C
Range > 1 V: ±500 PPM ±50 PPM/ÂșC
INPUT IMPEDANCE Range < 1 V: 100 MΩ min
Range > 1 V: 1 MΩ min
PROTECTION ±350 volts differential
±750 volts common-mode
ESD to 15 KV, human body model
NOISE REJECTION > 80 dB rejection of 50/60 Hz noise at default sample rate of 16.7/second
RTD INPUTS Four non-isolated external reference junction inputs for 4 wire platinum RTD sensor, 100Ω or 1 kΩ, ISO "385" curve
Protected against shorts, 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, 0.8 A max
+12 V, 5 mA 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

PDF Block Diagram: V450 analog/thermocouple input module

PDF Datasheet: V450 analog/thermocouple input module

PDF Manual: V450 analog/thermocouple input module

V450-1: 16-Channel VME Analog Input Module

V450-2: 16-Channel VME Analog Input Module with BIST

V450-151: 16-Channel VME Analog Input Module with pre-installed V451-50 50 Hz 6-Pole Analog Bessel Filter Option

V450-181: 16-Channel VME Analog Input Module with pre-installed V451-80 200 Hz 6-Pole Analog Bessel Filter Option

V450-251: 16-Channel VME Analog Input Module with BIST and pre-installed V451-50 50 Hz 6-Pole Analog Bessel Filter Option

V450-281: 16-Channel VME Analog Input Module with BIST and pre-installed V451-80 200 Hz 6-Pole Analog Bessel Filter Option

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

J75-1: D9 male to two(2) dual banana plug cable

J76: D9 OpenCVA busing cable

V451-50: V450 Plug-In Filter, 50 Hz Bessel version (factory installation only)

V451-80: V450 Plug-In Filter, 200 Hz Bessel version (factory installation only)