Model V490

16-channel VME multi-range digitizer

Overview

Features:
  • 16 channels of differential analog input acquisition
  • Each channel is independently programmable for input range, sample rate, operating modes, and digital lowpass filtering
  • Provides continuous, realtime measurement and simultaneously emulates classic filtered, triggered ADC modes
  • Input ranges from ± 10.24 mV to ± 40.96 volts with 16-bit resolution
  • Common-mode rejection 100 dB typical, ±10 V common-mode range
  • Overload protected to ± 250 volts on all ranges
  • ADC per channel with 500 Ks/s sample rate
  • Programmable lowpass filter per channel from 1 Hz to 100 KHz
  • 4K sample FIFO and trigger interpolator per channel provide nanosecond external-trigger accuracy
  • FIFO input sample rate is programmable with internal, VME, or external triggering
  • Simultaneous sampling, extendable across unlimited number of modules
  • Realtime and FIFO-buffered data simultaneously available
  • No realtime handshaking is required: once channel parameters are set up, measurements appear in dual-port memory registers with VMEbus-speed access
  • In-crate calibration check via dedicated test connector
  • Clearly labeled dipswitches set VME address; no jumpers, headers, or trimpots
  • Optional built-in self-test (BIST)
Description:

The V490 includes 16 independent acquisition channels, each with a programmable-gain differential amplifier, analog anti-aliasing filter, 16-bit analog-to-digital converter, and digital post-processing. With a dedicated A/D converter per channel, the V490 provides true simultaneous sampling, which can be extended across multiple V490s or triggered from an external TTL signal.

Both realtime and FIFO buffered data are simultaneously available, with each path having its own programmable digital filter. FIFO load rates are internally programmable to up to 500 Ks/s, or may be externally triggered. Digital processing allows emulation/replacement of a classic Neff type architecture, namely a preamp and analog lowpass filter feeding a low-aperture-jitter triggerable ADC per channel, while adding the ability to watch the real-time data at any time without disturbing the FIFO acquisition.

The V490 also integrates with Highland's advanced test and calibration architecture, allowing each channel to be relay switched to a dedicated calibration bus. The calibration bus allows one or many modules to be automatically connected to an external DVM, providing traceability with no need to disturb field wiring. Automatic built-in self-test is also available.