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1.6
DNx-VR-608
Features
1.6.1
Measurement
Capabilities
© Copyright 2024
United Electronic Industries, Inc.
DNx-VR-608 boards are 8-channel, variable reluctance (VR) sensor interface
boards. The DNA/DNR/DNF-VR-608 boards are electronically identical and
differ only in the hardware needed to mount the board in the selected chassis.
The board is designed for use in a wide variety of motion and rotation monitoring
applications. It can also be used as a general-purpose counter to measure AC
signals and TTL-level digital signals, including the output from a Hall Effect
sensor. This manual includes information for both Revision 1 and Revision 2
VR-608 boards.
Features of the DNx-VR-608 (Rev. 1 and Rev. 2) include:
•
8 fully differential analog input channels
•
Input range from 50 mV to 250 V peak-to-peak
•
Bipolar (VR) inputs rates up to 300 kHz
•
Unipolar (Hall/TTL) input rates up to 18 kHz
•
Conditioned inputs can be routed to TTL digital outputs
•
Adaptive Threshold input mode
•
True zero-cross detection
•
Inter-tooth timing allows acceleration tracking
•
Open circuit detection
Additional features available on Rev. 2 boards only:
•
4 isolated TTL digital inputs can be routed to internal counters
•
Alarms for open circuit, stalled rotation, and overspeed conditions.
Alarms can be routed to digital outputs.
•
Torque measurement for dual VR sensor systems
•
Digital Hall Effect sensor simulator
•
Timed Pulse Period Measurement (TPPM) Mode that features a
dynamic sampling window based on input frequency.
The DNx-VR-608 contains eight differential analog input channels designed to
support an extremely wide variety of variable reluctance sensors. Sensor
compatibility is made possible by the board's wide input range (50 mVpp to
250 Vpp) and high input impedance (40 kΩ). The board supports a maximum
pulse rate of 300 kHz for inputs ≥ 3.2 Vpp; measurable pulse rates for lower
signal levels are shown in Table 1-1.
Signal peaks and zero crossings may be configured for auto-detection. For
example, an "Adaptive Peak Threshold" (APT) mode sets the threshold to 30%
of a time-averaged input. A watchdog circuit resets the input to the minimum
threshold level if the input "drops out" for 85 milliseconds. Another APT mode
auto-computes the thresholds from the minimum and maximum voltages
measured by the board.
Users can also set zero crossing thresholds and peak thresholds to fixed voltage
levels for special use cases such as Hall Effect measurements and custom
signal conditioning applications.
Revision 2 boards provide four digital input channels for reading sensors which
already output a conditioned TTL-level signal. Digital inputs bypass the front-end
VR circuitry for a faster read rate.
February 2024
DNx-VR-608 Variable Reluctance Interface
Chapter 1
4
Introduction
www.ueidaq.com
508.921.4600
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