VTI Instruments Corp.
10
EX1200-1538: Introduction
world signal without the need for external signal conditioners. Programmable hysteresis and
threshold levels over the entire input voltage range help to extract the fundamental frequency from
even the noisiest of analog input signals. Electronic counter channels can directly measure the
RPM of tooth wheel and similar sensors. The EX1200-1538 provides a unique functionality that
prevents the frequency bumps caused by the missing/extra tooth used for marking a tooth wheel
sensor’s reference. Additionally, counter channels can measure position and speed from
Quadrature encoder signal pairs, including index channel (A, B, and Z).
The onboard memory of EX1200-1538 can store up to 256,000 measurement readings and
supports the unified EX1200 triggering system. By utilizing IEEE 1588 time stamps, data samples
can be easily correlated with other systems. Measurements can be paced at a constant rate so that
time differential parameters, such as acceleration, can be calculated.
The EX1200-1538 DIO channels can be configured as inputs or outputs on a per channel basis.
Each channel is isolated from the other and accepts voltages between 2.5V and 60 V. The output
channels use solid-state switches that work in any polarity. Setting the output logic levels and
reading the input logic states are fully programmable.
DAC output channels are configurable as either constant voltage or current mode and are
independent of each other. The output range is fixed (±10 V in voltage mode, and ±20 mA in
current mode) and its 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. The channel’s output can be statically updated using the API/SFP
or can be used to convert frequency measured from a counter channel to voltage/current output.
F
EATURES
195 kΩ input impedance and AC/DC coupling for counter channels
Single frequency measurement range that works from 0.05 Hz to 1 MHz
Stable TCXO base clock (50 MHz ±1 ppm)
Wide differential input voltage range (±48 V) with up to 250 V working common mode
voltage
Programmable threshold and hysteresis levels with 1 mV resolution
Support for Quadrature encoder
Isolated DIO channels with up to 60 V compliance
Isolated, independent 16-bit DAC channels configurable for voltage or current output
