Supply of electrical card module for GE IS215UCVEH2A control card
Technical data of product parameters
When used without signal conditioning input boards, the VMIVME-3122 provides
direct full scale input ranges from ±250 mV to ±10 V. The optimum input filter for
these applications is the 50 Hz filter, although the 10 Hz filter will provide improvedGE IS215UCVEH2A
attenuation of power line frequency interference at the expense of decreased
common-mode rejection. To minimize the effects of direct input multiplexing, the
inputs on the VMIVME-3122 are buffered using op-amps. The buffers supply a
constant low impedance to the Programmable Gain Amplifier GE IS215UCVEH2A regardless of the
varying source impedance. Use the lowest input gain and the largest block size (refer
to Chapter 3 “Programming”) that are practical for the application. If inputs are
obtained directly from remote sources, the grounding scheme used can have a major
effect on system performance. Each system has its own unique interference
considerations, but the following general guidelines will apply in most cases.
Long Input Lines: Long input lines (greater than 10 feet), or inputs from grounded
sources (sources which are not floating), should be connected to differential inputs,
and overall shields should be extended from the input sources to as close to the boardGE IS215UCVEH2A
as possible. Single-ended inputs are susceptible to ground loop errors, and should be
used only with high-level floating sources.
Source Impedance: Use signal sources with the lowest available source impedances.
Susceptibility to crosstalk and induced interference increases as the source impedance
increases.
Floating Signal Sources: The shield from a floating signal source (RTD, strain gage,
etc.) should be connected to the GE IS215UCVEH2A terminal at the source. For low
impedance sources GE IS215UCVEH2A or for sources which are protected from interference
fields, connect the board end of the shield to analog return (AGND) at the board. For
high impedance sources, connect all shield terminals of the sources together, and
leave the board ends of the shields open
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