Measurement Computing IOtech 640 Series - Manual (Page 17)

IOtech 640/650 Series 878893 Block Diagram 2-3
Digital I/O
To make use of the Digital I/O feature the 640 or 650 must be operating with eZ-TOMAS or eZ-NDT.
The 8-bits of digital I/O are provided via a rear panel DB9 connector. Each bit is programmable as
input or output.
Signal Conditioning
Every input to a 640 or 650 system is software programmable for AC/DC coupling, IEPE source [if AC
coupling is selected], and is capable of reading sensor calibration information using Transducer Electronic
Data Sheets (TEDS). eZ-Analyst software is required if the TEDS functionality is to be used.
When IEPE sensors are attached, AC coupling with bias current is selected via software. AC coupling
without bias is also possible for measuring any AC waveform. DC coupling, which is useful for proximity
sensor applications, can also be selected via the software.
For IEPE sensors, indication of an open or shorted fault is available within the eZ-Analyst software
application.
Source Output (640 units only)
640e and 640u each include one analog output channel capable of generating continuous waveforms.
These waveforms are programmable in regard to amplitude and frequency per product specifications.
They can be continuous sine, random, burst, or arbitrary.