Model V460

16-channel VME current source and analog measurement module

Overview

Features:
  • 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
Description:

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.