New Voltage Attenuator System
for Interfacing High-Voltage
to A/D Systems.
Dataforth Corporation, Tucson, Arizona announces the
introduction of its new SCMVAS (Signal Conditioning
Modular Voltage Attenuator System), an analogue signal
conditioning system, which is designed to safely monitor,
and accurately measure voltage potentials up to 1200V
These high-level voltages are typically found in industrial applications
such as induction heaters or electric-motor drive controllers.
The system reduces the input signal to a level suitable for interface
to data acquisition systems, while at the same time providing various
filter characteristics and 1500Vrms isolation.
The SCMVAS is comprised of either an 8 or 16-channel backpanel,
two models of SM5B signal conditioning modules, and various models
of SCMVAS-Mxxx attenuator modules. For each channel of high-voltage
analogue input, an attenuator module, the SCMVAS-Mxxx, reduces
the input signal to a low-level voltage, which is then connected to a
high-input impedance Dataforth SCM5B signal conditioning module;
the SCM5B31-21 or SCM5B41-21. The SCM5B module filters, isolates,
and converts the input signal to a voltage output suitable for a PLC or
an A/D converter in a data acquisition system. Signal filtering is
accomplished with a six-pole filter internal to the SCM5B module.
The SCM5B31-21 narrow bandwidth module has a cut off frequency
of 4Hz and provides 95dB of normal-mode-rejection at 60Hz and 90dB
at 50Hz. The SCM5B41-21 wide-bandwidth module has a cut off
frequency of 10kHz, which is high enough to measure power line
voltages and their associated harmonics. A 1500Vrms isolation
barrier is provided by transformer coupling, using a proprietary
technique to suppress transmission of common mode spikes or surges.
The attenuator and signal conditioning modules have excellent stability
over time and do not require re-calibration. Overall system accuracy is
Six standard SCMVAS-Mxxx attenuator modules are offered with
maximum voltage input ranges of ±100V, ±200V, ±300V, ±400V,
±500V, and ±600V. Custom input ranges may be ordered.
A pass-through module is also offered which allows any standard
SCM5B module to be used on the SCMVAS backpanels. This
feature allows connection on the same backpanel to other signal
types such as thermocouple, RTD, strain-gauge, or other.
Input signal connections to the attenuator modules are made using
a pluggable terminal block for ease of system assembly and
reconfiguration. For safety purposes, the terminal block has a
cover over the screws and there are no exposed high voltage points
on the SCMVAS-Mxxx module, SCM5B31-21 or SCM5B41-21
module, or the mounting backpanel.
The SCMVAS has two specially designed backpanels for mounting
the attenuator and signal conditioning modules. The SCMVAS-PB8
high density, 8-channel backpanel can be panel mounted or DIN rail
mounted and provides the conditioned output signal on screw terminal
Jumpers are provided on each channel to optionally connect or isolate
each module's I/O Common from other channel's I/O Common and/or
Power Common. The SCMVAS-PB16 has 16 channels simultaneously
available to high-speed data acquisition (ADC) boards through a
26-conductor ribbon cable. A 19-inch metal rack, the SCMXRK-002,
is available for mounting the SCMVAS-PB8 or SCMVAS-PB16
Both storage and operating temperature range of the system is -400C
to +850C with relative humidity levels up to 95% non-condensing.
The system requires 5VDC power.
For more information please contact:
Impulse Corporation Limited
Tel : +44(0) 1543 466552
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