6-2 Analog Signals 878893 640 & 650 Series
Features of the dynamic signal conditioning circuit:
o current source for transducer biasing (IEPE)
o detection of a transducer fault
o AC or DC coupling
o ±10 V range (IOtech 640 models)
o ±40 V range (IOtech 650 models)
o anti-aliasing filters: 3-pole low pass filter in hardware;
programmable digital filtering via software
o pseudo-differential inputs
o support for TEDS (Transducer Electronic Data Sheet), requires eZ-Analyst
o any analog input channel can serve as a tach input
o channel-to-channel phase matching
Signal parameters are independently controlled in software on a per channel basis.
For 640e and 640u, the conditioning circuit includes a built-in programmable voltage excitation source.
This source can be used to stimulate dynamic systems for transfer function measurements or serve as a test
signal for the input channels.
IOtech 640 and 650 Series Block Diagram
Comments pertaining to the diagram are included in Chapter 2.
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