Product category:
Sensors and Data Acquisition
News Release from: Impulse | Subject: Dataforth SCMVAS
Edited by the Electronicstalk Editorial
Team on 10 May 2001
Voltage attenuator system acquires HV
data safely
Available from Impulse Corporation, the Dataforth SCMVAS is an analogue signal conditioning system designed to safely monitor, and accurately measure voltage potentials up to 1200V peak-peak.
Available from Impulse Corporation, the Dataforth SCMVAS (signal conditioning modular voltage attenuator system) is an analogue signal conditioning system designed to safely monitor, and accurately measure voltage potentials up to 1200V peak-peak These high-level voltages are typically found in industrial applications such as induction heaters or electric-motor drive controllers
This article was originally published on Electronicstalk on 15 Mar 2000 at 8.00am (UK)
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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 1500V RMS 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.
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The SCM5B module filters, isolates, and converts the input signal to a voltage output suitable for a PLC or an A/D convertor 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 1500V RMS 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 recalibration.
Overall system accuracy is +/-0.1%.
Six standard SCMVAS-Mxxx attenuator modules are offered with maximum voltage input ranges of +/-100, +/-200, +/-300, +/-400, +/-500 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 blocks.
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 19in metal rack, the SCMXRK-002, is available for mounting the SCMVAS-PB8 or SCMVAS-PB16 backpanels.
Both storage and operating temperature range of the system is -40 to +85C with relative humidity levels up to 95% noncondensing.
The system requires 5V DC power.
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