V460 16-channel VME current source and analog measurement module

Current Source & Analog Measurement - V460
  • Includes 16-channel, multiplexed, programmable constant-current source and precision analog-to-digital converter
  • Capable of measuring nearly any mixture of resistive-, bridge- or semiconductor-type sensors, using 4-wire connections
  • Ideal for cryogenic applications using mixed sensor types
  • Ultrastable programmable constant current source: 1 µA, 10 µA, 100 µA, 1 mA source currents
  • 16-bit ADC includes programmable gain differential amplifier, autozeroing, and programmable digital noise filtering
  • All parameters are fully programmable for each channel
  • Fully self-scanning without processor intervention: conditioned data is presented in transparent dual-port memory registers
  • Reads sensor voltage drop directly; includes engineering unit conversion for common silicon diode and RTD type temperature sensors
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The V460 is a VME-based versatile source/measurement unit. It includes a programmable constant-current source, a precision programmable gain 16-bit analog-to-digital converter, and a 4-wire, 16-channel analog multiplexer. An internal microprocessor supervises channel scanning according to user loaded parameters, reporting sensor voltage drops or, for selected sensor types, engineering-unit data.

The V460 is ideal for precision temperature measurement, using mixed resistive and diode sensor types. The programmable current sources and low duty-cycle scanning assure low sensor self-heating. Programmable digital filtering allows selectable rejection of AC line hum and other noise sources.

The V460 can measure resistances from 5.12 Megohms full scale (with 78 ohm resolution) to 80 ohms full scale (with 1.22 milliohm resolution); voltages from 5.12 volts full scale to 80 mV full scale may be measured, with resolution to 1.22 microvolts. Extensive internal self-tests help assure accurate measurements.

FUNCTION 16 channel VME current source and analog measurement module
DEVICE TYPE 16-bit VME register-based slave: A16:D16:D08(EO)
Implements 64 16-bit registers at switch selectable addresses in the VME 16 bit addressing spaces
CHANNELS 16 channels, 4-wire sensor connections
INPUTS Less than 1000 MΩ
DC leakage current less than 200 pA
Inputs are not isolated from circuit common
ADC 16 bits, programmable 0/+5.12 volts or ±5.12 volts full scale; programmable preamplifier gains of 1, 4, 16, and 64 magnify full-scale span to 80 mV (LSB resolution 1.22 µV)
Accuracy ±0.01% ±25 PPM/K
The ADC is monotonic to 16 bits
RESISTANCE Resistance measurements are accurate to ±0.01% ±30 PPM/K for ISRC >1 µA , with preamplifier gains of 1, 4 and 16
SCAN RATE Typically 20 ms per channel; full scan of 16 channels requires less than 400 ms
Certain programmable options may increase scan times
CURRENT SOURCE Per-channel programmable to 0, 1 µA, 10 µA, 100 µA and 1 mA
Accuracy ±0.01% ±25 PPM/K, except 1 µA current is ±0.04% ±50 PPM/K
LINEARIZATION Includes engineering units conversion for Lakeshore cryo-diode sensors and ISO 385 curve platinum RTDs (100Ω or 1000Ω)
FILTERING Per-channel programmable digital lowpass filtering provides selectable time constants up to 128 samples
Sample timing and filtering are optimized for 50/60 Hz hum rejection
OPERATING TEMPERATURE -20 to +70°C; extended MIL/COTS ranges available
POWER Standard VME supplies:
+5 volts, 1.5 A nominal
+12 volts, 50 mA nominal (plus load current)
-12 volts, 50 mA nominal (plus load current)
CONNECTORS Two front panel female D37 connectors
INDICATORS Three LEDs, VME access, sensor SCAN performed and PASS/FAIL self-test
PACKAGING 6U single-wide VME module
CONFORMANCE ANSI/VITA 1-1994 (R2002) VMEbus spec

PDF Datasheet: V460 current source and analog measurement module

PDF Manual: V460 current source and analog measurement module

V460-1: 16-channel VME current source and analog measurement module