ETAS
Hardware Description
ES441.1 - User Guide
20
4.2
Block Diagram
The ES441.1 is a module with four identical measurement channels, its own
sensor supply for every measurement channel, two shared Ethernet interfaces
and a power supply.
Fig. 4
-
2
Block Diagram
4.3
Measurement Channels
All measurement channels of the ES441.1 are identical. They consist of an
input stage with signal acquisition and signal processing.
The measurement channels are designed for input voltages of -50 V to +50 V.
The minimum pulse width is limited to 120 ns. This limitation avoids the acqui
-
sition of interfering pulses on the measurement channels. The input imped
-
ance is greater than 2 M
.
4.3.1
Input Stage with Signal Acquisition and Signal Processing
Fig. 4
-
3
Input Stage
The input stage of every measurement channel (see Fig. 4
3 on page 20) con
-
sists of the following components:
• Schmitt trigger with a configurable hysteresis,
• galvanic isolation,
• interfering voltage filter,
• inverter and
• signal acquisition and signal processing.
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