Overview
The EX1200-1538 is a high performance multifunction card designed to provide frequency
measurement, digital I/O, and analog DAC output capability on a single card. This allows
users the ability to accommodate a wide range of mixed signals into a standard EX1200
series product. Combined with other cards/functions will allow for a complete measurement
system in as small a 1U of rack space.
This card provides 8-channels of independent 32-bit counters, 16 channels of isolated
Digitl I/O, and 2 channels of isolated analog output (DAC). While the refined electronic
counter functions will enhance the accuracy of time and frequency domain measurements,
configurable DIO and Analog output channels offer flexibility to measure and control various
industrial systems. A wide range of measurement functions make this card suitable for both
Electronic Functional test (ATE), as well as precision Data Acquisition applications. Deep
onboard memory enables faster & hardware timed data logging of measurement results. In
addition, Frequency inputs can be scaled to an analog output, via onboard hardware, for
achieving virtual Frequency to Analog Output function. The electronic counter utilizes 50 MHz
high stability (1 ppm), TCXO base clock oscillator, along with reciprocal counting method to
achieve a wide frequency measurement range spanning from 0.05 Hz to 1 MHz.
Functionality
Frequency/Counter
- Frequency measurements
- RPM measurements
- Pulse width measurements
- Counter/totalize functions
- Quadrature Input
Digital I/O
- Measure and control discrete inputs directly
- Read or write to a wide range of digital inputs
- Isolated
Analog Outputs (DAC)
- Programmable, 16-bit DAC
- Isolated outputs
The Electronic counter uses a 32-bit counter to measure time domain and frequency domain
parameters of repetitive and non-repetitive waveforms. Its reciprocal counting technique
ensures higher resolution and accuracy even if the input signals are of low frequency and
not synchronized to the aperture window. Counter channels accept both analog and digital
type inputs. The analog counter channels can accept inputs from ±48 V of true differential
voltages which makes it suitable to use with almost any real world signal, without the need
of external signal conditioners. Programmable hysteresis and threshold levels over the entire
input voltage range can help to extract the fundamental frequency from the noisiest analog
input signals. Electronic counter channels can directly measure the RPM from tooth wheel
and other types of sensors. The EX1200-1538 unique functionality prevents the frequency
bumps caused by missing / extra tooth used for marking the reference. Counter channels
can measure position and speed from quadrature encoder signal pairs, including index
channel (A,B & Z).
On-board memory of EX1200-1538 can store up to 256,000 measurement readings,
and supports the unified EX1200 triggering system. This makes the data samples time
stamped in the IEEE 1588 format for easy correlation with other data from other systems.
Measurements can also be paced at a constant rate, so that time differential parameters like
acceleration can be calculated.
The EX1200-1538 Digital IO channels can be configured as Input or output, on a per channel
basis. Each channel is isolated from each other, and can accept voltages from 2.5 V to 60 V.
The output channels use solid-state switches that can work in any polarity. Setting the output
logic levels, and reading the input logic states is fully controlled through software.
DAC analog output channels are configurable as either constant voltage mode or constant
current mode, independent of each other. The output range is fixed (±10 V in Voltage mode,
and ±20 mA in Current mode), and the output levels are programmable with 16-bit resolution.
Both channels are isolated from each other, and fully protected, providing the capability to be
connected in series or parallel for an even wider output range.
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